publicationDate stringlengths 1 2.79k | title stringlengths 1 36.5k ⌀ | abstract stringlengths 1 37.3k ⌀ | id stringlengths 9 47 |
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2004-04-30 | On violation of the Robinson's damping criterion and enhanced cooling of ion, electron and muon beams in storage rings | Limits of applicability of the Robinson's damping criterion and the problem
of enhanced cooling of particle beams in storage rings beyond the criterion are
discussed. | 0404142v6 |
2004-12-28 | Electron Bernstein waves in spherical tokamak plasmas with "magnetic wells" | In addition to traditional regimes with monotonously increasing magnetic
field, regimes with "magnetic wells" also occur in spherical tokamaks (STs).
The magnetic field profile inversion modifies significantly the whole picture
of the wave propagation and damping. Since the magnetic wells may become quite
common with f... | 0412173v1 |
2005-08-16 | Creep-Enhanced Low-Frequency Sensitivity of Seismometers | The frequency response of a seismometer is typically assumed to be the
textbook case of a viscous damped, simple harmonic oscillator. Real mechanical
oscillators are not ideal, and the damping at low frequencies, due to internal
friction, is presently too poorly understood to describe from first principles.
Even if the... | 0508105v1 |
2006-06-22 | Looking for a time independent Hamiltonian of a dynamical system | In this paper we introduce a method for finding a time independent
Hamiltonian of a given dynamical system by canonoid transformation. We also
find a condition that the system should satisfy to have an equivalent time
independent formulation. We study the example of damped oscillator and give the
new time independent H... | 0606197v2 |
1996-02-27 | Effects of Loss and Decoherence on a Simple Quantum Computer | We investigate the impact of loss (amplitude damping) and decoherence (phase
damping) on the performance of a simple quantum computer which solves the
one-bit Deutsch problem. The components of this machine are beamsplitters and
nonlinear optical Kerr cells, but errors primarily originate from the latter.
We develop mo... | 9602018v1 |
1996-11-25 | The Quantum state diffusion model and the driven damped nonlinear oscillator | We consider a driven damped anharmonic oscillator which classically leads to
a bistable steady state and to hysteresis. The quantum counterpart for this
system has an exact analytical solution in the steady state which does not
display any bistability or hysteresis. We use quantum state diffusion theory to
describe thi... | 9611044v1 |
1997-12-02 | Prevention of dissipation with two particles | An error prevention procedure based on two-particle encoding is proposed for
protecting an arbitrary unknown quantum state from dissipation, such as phase
damping and amplitude damping. The schemes, which exhibits manifestation of the
quantum Zeno effect, is effective whether quantum bits are decohered
independently or... | 9712005v1 |
1998-02-23 | Caldirola-Kanai Oscillator in Classical Formulation of Quantum Mechanics | The quadrature distribution for the quantum damped oscillator is introduced
in the framework of the formulation of quantum mechanics based on the
tomography scheme. The probability distribution for the coherent and Fock
states of the damped oscillator is expressed explicitly in terms of Gaussian
and Hermite polynomials... | 9802057v1 |
1999-03-22 | Decoherence - Fluctuation Relation and Measurement Noise | We discuss fluctuations in the measurement process and how these fluctuations
are related to the dissipational parameter characterising quantum damping or
decoherence. On the example of the measuring current of the variable-barrier or
QPC problem we show there is an extra noise or fluctuation connected with the
possibl... | 9903072v1 |
1999-07-27 | Nonclassical correlations in damped N-solitons | The quantum statistics of damped higher-order optical solitons are analyzed
numerically, using cumulant-expansion techniques in Gaussian approximation. A
detailed analysis of nonclassical properties in both the time and the frequency
domain is given, with special emphasis on the role of absorption. Highly
nonclassical ... | 9907090v2 |
2001-01-08 | Cavity-damping-induced transitions in a driven atom-cavity system | We investigate the fluorescence spectrum of a two-level atom in a cavity when
the atom is driven by a classical field. We show that forbidden dipole
transitions in the Jaynes-Cummings Ladder structure are induced in the presence
of the cavity damping, which deteriorates the degree of otherwise perfect
destructive inter... | 0101036v1 |
2001-06-09 | Squeezing enhancement by damping in a driven atom-cavity system | In a driven atom-cavity coupled system in which the two-level atom is driven
by a classical field, the cavity mode which should be in a coherent state in
the absence of its reservoir, can be squeezed by coupling to its reservoir. The
squeezing effect is enhanced as the damping rate of the cavity is increased to
some ex... | 0106054v1 |
2001-08-01 | Decoherence-induced wave packet splitting | We provide an intuitive interpretation of the optical Stern-Gerlach effect
(OSGE) in the dressed-state point of view. We also analyze the effect of atomic
damping in an experiment on the OSGE. We show that the atomic damping also
causes the wave packet splitting, in a non-mechanical fashion, as opposed to
the coherent ... | 0108005v1 |
2001-08-11 | A Canonical Approach to the Quantization of the Damped Harmonic Oscillator | We provide a new canonical approach for studying the quantum mechanical
damped harmonic oscillator based on the doubling of degrees of freedom
approach. Explicit expressions for Lagrangians of the elementary modes of the
problem, characterising both forward and backward time propagations are given.
A Hamiltonian anal... | 0108055v2 |
2002-05-09 | Implementation of quantum maps by programmable quantum processors | A quantum processor is a device with a data register and a program register.
The input to the program register determines the operation, which is a
completely positive linear map, that will be performed on the state in the data
register. We develop a mathematical description for these devices, and apply it
to several d... | 0205050v1 |
2002-08-28 | Damped Quantum Interference using Stochastic Calculus | It is shown how the phase-damping master equation, either in Markovian and
nonMarkovian regimes, can be obtained as an averaged random unitary evolution.
This, apart from offering a common mathematical setup for both regimes, enables
us to solve this equation in a straightforward manner just by solving the
Schrodinger ... | 0208176v1 |
2002-10-31 | Quantum Markov Channels for Qubits | We examine stochastic maps in the context of quantum optics. Making use of
the master equation, the damping basis, and the Bloch picture we calculate a
non-unital, completely positive, trace-preserving map with unequal damping
eigenvalues. This results in what we call the squeezed vacuum channel. A
geometrical picture ... | 0211001v1 |
2003-01-17 | Concurrence and foliations induced by some 1-qubit channels | We start with a short introduction to the roof concept. An elementary
discussion of phase-damping channels shows the role of anti-linear operators in
representing their concurrence. A general expression for some concurrences is
derived. We apply it to 1-qubit channels of length two, getting induced
foliations of the st... | 0301088v1 |
2003-05-19 | Statistical Effects in the Multistream Model for Quantum Plasmas | A statistical multistream description of quantum plasmas is formulated, using
the Wigner-Poisson system as dynamical equations. A linear stability analysis
of this system is carried out, and it is shown that a Landau-like damping of
plane wave perturbations occurs due to the broadening of the background Wigner
function... | 0305102v1 |
2003-06-28 | Misbelief and misunderstandings on the non--Markovian dynamics of a damped harmonic oscillator | We use the exact solution for the damped harmonic oscillator to discuss some
relevant aspects of its open dynamics often mislead or misunderstood. We
compare two different approximations both referred to as Rotating Wave
Approximation. Using a specific example, we clarify some issues related to
non--Markovian dynamics,... | 0306193v3 |
2003-11-26 | Effective damping in the Raman cooling of trapped ions | We present a method of treating the interaction of a single three-level ion
with two laser beams. The idea is to apply a unitary transformation such that
the exact transformed Hamiltonian has one of the three levels decoupled for all
values of the detunings. When one takes into account damping, the evolution of
the sys... | 0311183v1 |
2004-06-20 | Entanglement-assisted classical information capacity of the amplitude damping channel | In this paper, we calculate the entanglement-assisted classical information
capacity of amplitude damping channel and compare it with the particular mutual
information which is considered as the entanglement-assisted classical
information capacity of this channel in Ref. 6. It is shown that the difference
between them ... | 0406140v1 |
2004-08-13 | Decoherence versus Dynamical Casimir Effect | By means of two simple examples: phase and amplitude damping, the impact of
decoherence on the dynamical Casimir effect is investigated. Even without
dissipating energy (i.e., pure phase damping), the amount of created particles
can be diminished significantly via the coupling to the environment (reservoir
theory) indu... | 0408087v2 |
2004-10-11 | Quantizing the damped harmonic oscillator | We consider the Fermi quantization of the classical damped harmonic
oscillator (dho). In past work on the subject, authors double the phase space
of the dho in order to close the system at each moment in time. For an
infinite-dimensional phase space, this method requires one to construct a
representation of the CAR alg... | 0410078v1 |
2004-11-18 | Drastic effects of damping mechanisms on the third-order optical nonlinearity | We have investigated the optical response of superradiant atoms, which
undergoes three different damping mechanisms: radiative dissipation
($\gamma_r$), dephasing ($\gamma_d$), and nonradiative dissipation
($\gamma_n$). Whereas the roles of $\gamma_d$ and $\gamma_n$ are equivalent in
the linear susceptibility, the thir... | 0411129v1 |
2005-01-19 | Stabilizing an atom laser using spatially selective pumping and feedback | We perform a comprehensive study of stability of a pumped atom laser in the
presence of pumping, damping and outcoupling. We also introduce a realistic
feedback scheme to improve stability by extracting energy from the condensate
and determine its effectiveness. We find that while the feedback scheme is
highly efficien... | 0501101v1 |
2005-06-11 | Quantum damped oscillator II: Bateman's Hamiltonian vs. 2D Parabolic Potential Barrier | We show that quantum Bateman's system which arises in the quantization of a
damped harmonic oscillator is equivalent to a quantum problem with 2D parabolic
potential barrier known also as 2D inverted isotropic oscillator. It turns out
that this system displays the family of complex eigenvalues corresponding to
the pole... | 0506091v1 |
2005-06-27 | Entanglement of pair cat states and teleportation | The entanglement of pair cat states in the phase damping channel is studied
by employing the relative entropy of entanglement. It is shown that the pair
cat states can always be distillable in the phase damping channel. Furthermore,
we analyze the fidelity of teleportation for the pair cat states by using joint
measure... | 0506217v1 |
2005-07-21 | Entanglement versus mixedness for coupled qubits under a phase damping channel | Quantification of entanglement against mixing is given for a system of
coupled qubits under a phase damping channel. A family of pure initial joint
states is defined, ranging from pure separable states to maximally entangled
state. An ordering of entanglement measures is given for well defined initial
state amount of e... | 0507212v2 |
2005-10-20 | Overdamping by weakly coupled environments | A quantum system weakly interacting with a fast environment usually undergoes
a relaxation with complex frequencies whose imaginary parts are damping rates
quadratic in the coupling to the environment, in accord with Fermi's ``Golden
Rule''. We show for various models (spin damped by harmonic-oscillator or
random-matri... | 0510164v1 |
2006-06-07 | Comment on "Optimum Quantum Error Recovery using Semidefinite Programming" | In a recent paper ([1]=quant-ph/0606035) it is shown how the optimal recovery
operation in an error correction scheme can be considered as a semidefinite
program. As a possible future improvement it is noted that still better error
correction might be obtained by optimizing the encoding as well. In this note
we present... | 0606059v1 |
2006-09-19 | Quantum master equations from classical Lagrangians with two stochastic forces | We show how a large family of master equations, describing quantum Brownian
motion of a harmonic oscillator with translationally invariant damping, can be
derived within a phenomenological approach, based on the assumption that an
environment can be simulated by two classical stochastic forces. This family is
determine... | 0609144v3 |
2006-10-16 | Local noise can enhance entanglement teleportation | Recently we have considered two-qubit teleportation via mixed states of four
qubits and defined the generalized singlet fraction. For single-qubit
teleportation, Badziag {\em et al.} [Phys. Rev. A {\bf 62}, 012311 (2000)] and
Bandyopadhyay [Phys. Rev. A {\bf 65}, 022302 (2002)] have obtained a family of
entangled two-q... | 0610125v1 |
2006-11-24 | High fidelity transfer of an arbitrary quantum state between harmonic oscillators | It is shown that by switching a specific time-dependent interaction between a
harmonic oscillator and a transmission line (a waveguide, an optical fiber,
etc.) the quantum state of the oscillator can be transferred into that of
another oscillator coupled to the distant other end of the line, with a
fidelity that is ind... | 0611249v1 |
2006-12-05 | Quantum Brownian motion and the second law of thermodynamics | We consider a single harmonic oscillator coupled to a bath at zero
temperature. As is well known, the oscillator then has a higher average energy
than that given by its ground state. Here we show analytically that for a
damping model with arbitrarily discrete distribution of bath modes and damping
models with continuou... | 0612038v1 |
2007-05-08 | Minimal qudit code for a qubit in the phase-damping channel | Using the stabilizer formalism we construct the minimal code into a
D-dimensional Hilbert space (qudit) to protect a qubit against phase damping.
The effectiveness of this code is then studied by means of input-output
fidelity. | 0705.1099v3 |
2007-05-10 | Anomalous Diffusion of particles with inertia in external potentials | Recently a new type of Kramers-Fokker-Planck Equation has been proposed [R.
Friedrich et al. Phys. Rev. Lett. {\bf 96}, 230601 (2006)] describing anomalous
diffusion in external potentials. In the present paper the explicit cases of a
harmonic potential and a velocity-dependend damping are incorporated. Exact
relations... | 0705.1480v1 |
2007-05-31 | Stability of Solutions to Damped Equations with Negative Stiffness | This article concerns the stability of a model for mass-spring systems with
positive damping and negative stiness. It is well known that when the
coefficients are frozen in time the system is unstable. Here we find conditions
on the variable cofficients to prove stability. In particular, we disprove the
believe that if... | 0705.4670v1 |
2007-06-13 | Polymers in a vacuum | In a variety of situations, isolated polymer molecules are found in a vacuum
and here we examine their properties. Angular momentum conservation is shown to
significantly alter the average size of a chain and its conservation is only
broken slowly by thermal radiation. The time autocorrelation for monomer
position osci... | 0706.2001v1 |
2007-07-15 | Enhancement of Carrier Mobility in Semiconductor Nanostructures by Dielectric Engineering | We propose a technique for achieving large improvements in carrier mobilities
in 2- and 1-dimensional semiconductor nanostructures by modifying their
dielectric environments. We show that by coating the nanostructures with
high-$\kappa$ dielectrics, scattering from Coulombic impurities can be strongly
damped. Though sc... | 0707.2244v1 |
2007-07-23 | Causal vs. Noncausal Description of Nonlinear Wave Mixing; Resolving the Damping-Sign Controversy | Frequency-domain nonlinear wave mixing processes may be described either
using response functions whereby the signal is generated after all interactions
with the incoming fields, or in terms of scattering amplitudes where all fields
are treated symetrically with no specific time ordering. Closed Green's
function expres... | 0707.3458v1 |
2007-07-27 | Excitation of spin dynamics by spin-polarized current in vortex state disks | A spin-polarized current with the polarization perpendicular to the plane of
a vortex-state disk results in renormalization of the effective damping for a
given magnetization mode, and the effective damping becomes zero if the current
exceeds a threshold value. The lowest threshold current corresponds to the
lowest fre... | 0707.4128v1 |
2007-09-11 | Frequency and damping of the Scissors Mode of a Fermi gas | We calculate the frequency and damping of the scissors mode in a classical
gas as a function of temperature and coupling strength. Our results show good
agreement with the main features observed in recent measurements of the
scissors mode in an ultracold gas of $^6$Li atoms. The comparison between
theory and experiment... | 0709.1617v2 |
2007-09-14 | Strong collisionless damping of the low-velocity branch of electromagnetic wave in plasmas with Maxwellian-like electron velocity distribution function | After approximate replacing of Maxwellian distribution exponent with the
rational polynomial fraction we have obtained precise analytical expression for
and calculated the principal value of logarithmically divergent integral in the
electron wave dispersion equation. At the same time our calculations have shown
the pre... | 0709.2206v1 |
2007-09-14 | Plasmons, plasminos and Landau damping in a quasiparticle model of the quark-gluon plasma | A phenomenological quasiparticle model is surveyed for 2+1 quark flavors and
compared with recent lattice QCD results. Emphasis is devoted to the effects of
plasmons, plasminos and Landau damping. It is shown that thermodynamic bulk
quantities, known at zero chemical potential, can uniquely be mapped towards
nonzero ch... | 0709.2262v2 |
2007-10-24 | Spin dynamics of a trapped spin-1 Bose Gas above the Bose-Einstein transition temperature | We study collective spin oscillations in a spin-1 Bose gas above the
Bose-Einstein transition temperature. Starting from the Heisenberg equation of
motion, we derive a kinetic equation describing the dynamics of a thermal gas
with the spin-1 degree of freedom. Applying the moment method to the kinetic
equation, we stud... | 0710.4419v2 |
2007-11-19 | Nonlinear mode conversion in monodomain magnetic squares | Modifications of spatial distributions of dynamic magnetization corresponding
to spinwave eigenmodes of magnetic squares subjected to a strong microwave
excitation field have been studied experimentally and theoretically. We show
that an increase of the excitation power leads to a nonlinear generation of
long-wavelengt... | 0711.2872v1 |
2007-12-18 | Weibel Instabilities in Dense Quantum Plasmas | The quantum effect on the Weibel instability in an unmagnetized plasma is
presented. Our analysis shows that the quantum effect tends to stabilize the
Weibel instability in the hydrodynamic regime, whereas it produces a new
oscillatory instability in the kinetic regime. A novel effect the quantum
damping, which is asso... | 0712.2874v1 |
2008-01-18 | A qualitative perspective on the dynamics of a single-Cooper-pair box with a phase-damped cavity | In a recent paper Dajka, et.al., [J. Phys. A \textbf{40}, F879 (2007)]
predicted that some composite systems can be entangled forever even if coupled
with a thermal bath. We analyze the transient entanglement of a
single-Cooper-pair box biased by a classical voltage and irradiated by a
quantized field and find the unus... | 0801.2905v2 |
2008-02-28 | Current driven spin-wave instability triggered by the anomalous Hall effect | We studied the effect of strong electric current on spin waves interacting
relativistically with the current. The spin-wave spectrum is calculated at
arbitrary direction of the wave vector. It is shown that the alternating Hall
current generated by the alternating magnetic moment of the spin waves, reduces
the spin-wav... | 0802.4150v1 |
2008-03-31 | Spectral Modeling of Magnetohydrodynamic Turbulent Flows | We present a dynamical spectral model for Large Eddy Simulation of the
incompressible magnetohydrodynamic (MHD) equations based on the Eddy Damped
Quasi Normal Markovian approximation. This model extends classical spectral
Large Eddy Simulations for the Navier-Stokes equations to incorporate general
(non Kolmogorovian)... | 0803.4499v1 |
2008-04-10 | Trapped Phase-Segregated Bose-Fermi Mixtures and their Collective Excitations | Recent progress in the field of ultracold gases has allowed the creation of
phase-segregated Bose-Fermi systems. We present a theoretical study of their
collective excitations at zero temperature. As the fraction of fermion to boson
particle number increases, the collective mode frequencies take values between
those fo... | 0804.1759v2 |
2008-04-14 | Size dependence of multipolar plasmon resonance frequencies and damping rates in simple metal spherical nanoparticles | Multipolar plasmon oscillation frequencies and corresponding damping rates
for nanospheres formed of the simplest free-electron metals are studied. The
possibility of controlling plasmon features by choosing the size and dielectric
properties of the sphere surroundings is discussed. Optical properties of the
studied me... | 0804.2156v1 |
2008-05-09 | Spin dynamics in (III,Mn)V ferromagnetic semiconductors: the role of correlations | We address the role of correlations between spin and charge degrees of
freedom on the dynamical properties of ferromagnetic systems governed by the
magnetic exchange interaction between itinerant and localized spins. For this
we introduce a general theory that treats quantum fluctuations beyond the
Random Phase Approxi... | 0805.1320v2 |
2008-06-05 | Thermally Assisted Spin Hall Effect | The spin polarized charge transport is systematically analyzed as a thermally
driven stochastic process. The approach is based on Kramers' equation
describing the semiclassical motion under the inclusion of stochastic and
damping forces. Due to the relativistic spin-orbit coupling the damping
experiences a relativistic... | 0806.0948v1 |
2008-06-13 | General Solution of the Quantum Damped Harmonic Oscillator II : Some Examples | In the preceding paper (arXiv : 0710.2724 [quant-ph]) we have constructed the
general solution for the master equation of quantum damped harmonic oscillator,
which is given by the complicated infinite series in the operator algebra
level. In this paper we give the explicit and compact forms to solutions
(density operat... | 0806.2169v1 |
2008-08-09 | Gilbert Damping in Conducting Ferromagnets I: Kohn-Sham Theory and Atomic-Scale Inhomogeneity | We derive an approximate expression for the Gilbert damping coefficient
\alpha_G of itinerant electron ferromagnets which is based on their description
in terms of spin-density-functional-theory (SDFT) and Kohn-Sham quasiparticle
orbitals. We argue for an expression in which the coupling of magnetization
fluctuations t... | 0808.1373v1 |
2008-08-27 | Entanglement dynamics of two-qubit system in different types of noisy channels | In this paper, we study entanglement dynamics of a two-qubit extended
Werner-like state locally interacting with independent noisy channels, i.e.,
amplitude damping, phase damping and depolarizing channels. We show that the
purity of initial entangled state has direct impacts on the entanglement
robustness in each nois... | 0808.3690v1 |
2008-09-01 | Heatons induced by attosecond laser pulses | In this paper the dynamics of the interaction of attosecond laser pulses with
matter is investigated. It will be shown that the master equation: modified
Klein-Gordon equation describes the propagation of the heatons. Heatons are the
thermal wave packets. When the duration of the laser pulses is of the order of
attosec... | 0809.0204v1 |
2008-10-09 | Heat conduction in 2D strongly-coupled dusty plasmas | We perform non-equilibrium simulations to study heat conduction in
two-dimensional strongly coupled dusty plasmas. Temperature gradients are
established by heating one part of the otherwise equilibrium system to a higher
temperature. Heat conductivity is measured directly from the stationary
temperature profile and hea... | 0810.1623v2 |
2008-10-21 | Structurally damped plate and wave equations with random point force in arbitrary space dimensions | In this paper we consider structurally damped plate and wave equations with
point and distributed random forces. In order to treat space dimensions more
than one, we work in the setting of $L^q$--spaces with (possibly small)
$q\in(1,2)$. We establish existence, uniqueness and regularity of mild and weak
solutions to th... | 0810.3898v2 |
2008-11-05 | Spectral function and quasi-particle damping of interacting bosons in two dimensions | We employ the functional renormalization group to study dynamical properties
of the two-dimensional Bose gas. Our approach is free of infrared divergences,
which plague the usual diagrammatic approaches, and is consistent with the
exact Nepomnyashchy identity, which states that the anomalous self-energy
vanishes at zer... | 0811.0624v2 |
2008-11-13 | Existence of weak solutions to the Cauchy problem of a semilinear wave equation with supercritical interior source and damping | In this paper we show existence of finite energy solutions for the Cauchy
problem associated with a semilinear wave equation with interior damping and
supercritical source terms. The main contribution consists in dealing with
super-supercritical source terms (terms of the order of $|u|^p$ with $p\geq 5$
in $n=3$ dimens... | 0811.2151v1 |
2008-11-17 | Asymptotic stability and blow up for a semilinear damped wave equation with dynamic boundary conditions | In this paper we consider a multi-dimensional wave equation with dynamic
boundary conditions, related to the Kelvin-Voigt damping. Global existence and
asymptotic stability of solutions starting in a stable set are proved. Blow up
for solutions of the problem with linear dynamic boundary conditions with
initial data in... | 0811.2783v3 |
2008-11-19 | Weyl laws for partially open quantum maps | We study a toy model for "partially open" wave-mechanical system, like for
instance a dielectric micro-cavity, in the semiclassical limit where ray
dynamics is applicable. Our model is a quantized map on the 2-dimensional
torus, with an additional damping at each time step, resulting in a subunitary
propagator, or "dam... | 0811.3134v2 |
2008-12-16 | A picogram and nanometer scale photonic crystal opto-mechanical cavity | We describe the design, fabrication, and measurement of a cavity
opto-mechanical system consisting of two nanobeams of silicon nitride in the
near-field of each other, forming a so-called "zipper" cavity. A photonic
crystal patterning is applied to the nanobeams to localize optical and
mechanical energy to the same cub... | 0812.2953v1 |
2009-02-12 | Discrete breathers in a forced-damped array of coupled pendula: Modeling, Computation and Experiment | In this work, we present a mechanical example of an experimental realization
of a stability reversal between on-site and inter-site centered localized
modes. A corresponding realization of a vanishing of the Peierls-Nabarro
barrier allows for an experimentally observed enhanced mobility of the
localized modes near the ... | 0902.2129v1 |
2009-03-08 | Enhancement of transmission rates in quantum memory channels with damping | We consider the transfer of quantum information down a single-mode quantum
transmission line. Such quantum channel is modeled as a damped harmonic
oscillator, the interaction between the information carriers -a train of N
qubits- and the oscillator being of the Jaynes-Cummings kind. Memory effects
appear if the state o... | 0903.1424v1 |
2009-03-15 | A variational approach to strongly damped wave equations | We discuss a Hilbert space method that allows to prove analytical
well-posedness of a class of linear strongly damped wave equations. The main
technical tool is a perturbation lemma for sesquilinear forms, which seems to
be new. In most common linear cases we can furthermore apply a recent result
due to Crouzeix--Haase... | 0903.2599v2 |
2009-03-30 | Damping of Exciton Rabi Rotations by Acoustic Phonons in Optically Excited InGaAs/GaAs Quantum Dots | We report experimental evidence identifying acoustic phonons as the principal
source of the excitation-induced-dephasing (EID) responsible for the intensity
damping of quantum dot excitonic Rabi rotations. The rate of EID is extracted
from temperature dependent Rabi rotation measurements of the ground-state
excitonic t... | 0903.5278v2 |
2009-05-13 | Landau damping | In this note we present the main results from the recent work
hal-00376547/arXiv:0904.2760, which for the first time establish Landau damping
in a nonlinear context. | 0905.2167v2 |
2009-05-13 | Amortissement Landau | Dans cette note nous pr\'esentons les principaux r\'esultats du r\'ecent
travail hal-00376547/arXiv:0904.2760, o\`u le ph\'enom\`ene d'amortissement
Landau est pour la premi\`ere fois \'etabli dans un contexte non lin\'eaire.
-----
In this note we present the main results from the recent work hal-00376547 /
arXiv:0... | 0905.2168v2 |
2009-06-27 | Effect of Bohm potential on a charged gas | Bohm's interpretation of Quantum Mechanics leads to the derivation of a
Quantum Kinetic Equation (QKE): in the present work, propagation of waves in
charged quantum gases is investigated starting from this QKE. Dispersion
relations are derived for fully and weakly degenerate fermions and bosons
(these latter above crit... | 0906.5061v1 |
2009-07-14 | Quantum Monty Hall problem under decoherence | We study the effect of decoherence on quantum Monty Hall problem under the
influence of amplitude damping, depolarizing and dephasing channels. It is
shown that under the effect of decoherence, there is a Nash equilibrium of the
game in case of depolarizing channel for Alice's quantum strategy. Where as in
case of deph... | 0907.2293v1 |
2009-09-11 | Energy decay for the damped wave equation under a pressure condition | We establish the presence of a spectral gap near the real axis for the damped
wave equation on a manifold with negative curvature. This results holds under a
dynamical condition expressed by the negativity of a topological pressure with
respect to the geodesic flow. As an application, we show an exponential decay
of th... | 0909.2093v1 |
2009-09-12 | Signature of smooth transition from diabatic to adiabatic states in heavy-ion fusion reactions at deep subbarrier energies | We propose a novel extension of the standard coupled-channels framework for
heavy-ion reactions in order to analyze fusion reactions at deep subbarrier
incident energies. This extension simulates a smooth transition between the
diabatic two-body and the adiabatic one-body states. To this end, we damp
gradually the off-... | 0909.2298v1 |
2009-10-05 | Construction of quasi-periodic response solutions in forced strongly dissipative systems | We consider a class of ordinary differential equations describing
one-dimensional quasiperiodically forced systems in the presence of large
damping. We give a fully constructive proof of the existence of response
solutions, that is quasi-periodic solutions which have the same frequency
vector as the forcing. This requi... | 0910.0746v1 |
2009-10-14 | Plasmon-phonon Strongly-Coupled Mode in Epitaxial Graphene | We report the dispersion measurements, using angle-resolved reflection
electron-energy-loss-spectroscopy (AREELS), on two-dimensional (2D) plasmons in
single and multilayer graphene which couple strongly to surface optical phonon
(FK phonon) modes of silicon carbide substrate. The coupled modes show discrete
dispersion... | 0910.2735v1 |
2009-10-23 | Collective Enhancement and Suppression of Excitation Decay in Optical Lattices | We calculate radiative lifetimes of collective electronic excitations of
atoms in an infinite one dimensional lattice. The translational symmetry along
the lattice restricts the photon wave vector component parallel to the lattice
to the exciton wave number and thus the possible emission directions. The
resulting radia... | 0910.4501v1 |
2009-10-24 | Global Attractor for Weakly Damped Forced KdV Equation in Low Regularity on T | In this paper we consider the long time behavior of the weakly damped, forced
Korteweg-de Vries equation in the Sololev spaces of the negative indices in the
periodic case. We prove that the solutions are uniformly bounded in
$\dot{H}^s(\T)$ for $s>-\dfrac{1}{2}$. Moreover, we show that the solution-map
possesses a glo... | 0910.4652v1 |
2009-11-12 | A new perspective on supersymmetric inflation | We consider supersymmetric inflation with the hybrid-type potential. In the
absence of the symmetry that forbids Hubble-induced mass terms, the inflaton
mass will be as large as the Hubble scale during inflation. We consider
gravitational decay of the trigger field as the least decay mode and find that
the damping caus... | 0911.2350v1 |
2009-12-15 | Distillability sudden death in qutrit-qutrit systems under amplitude damping | Recently it has been discovered that certain two-qutrit entangled states
interacting with global and/or multi-local decoherence undergo distillability
sudden death (DSD). We investigate this phenomenon for qutrit-qutrit systems
interacting with statistically independent zero-temperature reservoirs. We show
that certain... | 0912.2868v1 |
2009-12-15 | Global Controllability of Multidimensional Rigid Body by Few Torques | We study global controllability of 'rotating' multidimensional rigid body
(MRB) controlled by application of few torques. Study by methods of geometric
control requires analysis of algebraic structure introduced by the quadratic
term of Euler-Frahm equation. We discuss problems, which arise in the course of
this analys... | 0912.2900v1 |
2010-01-16 | Resonance Damping in Ferromagnets and Ferroelectrics | The phenomenological equations of motion for the relaxation of ordered phases
of magnetized and polarized crystal phases can be developed in close analogy
with one another. For the case of magnetized systems, the driving magnetic
field intensity toward relaxation was developed by Gilbert. For the case of
polarized syst... | 1001.2845v1 |
2010-02-05 | Damping Effect of Electromagnetic Radiation and Time-Dependent Schrodinger Equation | The inexactness of the time-dependent Schr\"odinger equation of a charged
particle in an external electromagnetic field is discussed in terms of the
damping effect of the radiation. A possible improvement is to add a nonlinear
term representing this effect to the linear Schr\"odinger equation. Conditions
for the nonlin... | 1002.1116v3 |
2010-02-05 | Uniform stabilization in weighted Sobolev spaces for the KdV equation posed on the half-line | Studied here is the large-time behavior of solutions of the Korteweg-de Vries
equation posed on the right half-line under the effect of a localized damping.
Assuming as in \cite{linares-pazoto} that the damping is active on a set
$(a_0,+\infty)$ with $a_0>0$, we establish the exponential decay of the
solutions in the w... | 1002.1127v1 |
2010-03-28 | Giant magnetic broadening of ferromagnetic resonance in a GMR Co/Ag/Co/Gd quadlayer | Both magnetic-resonance damping and the giant magnetoresistance effect have
been predicted to be strongly affected by the local density of states in thin
ferromagnetic films. We employ the antiferromagnetic coupling between Co and Gd
to provide a spontaneous change from parallel to antiparallel alignment of two
Co film... | 1003.5344v1 |
2010-04-04 | Quantum information reclaiming after amplitude damping | We investigate the quantum information reclaim from the environment after
amplitude damping has occurred. In particular we address the question of
optimal measurement on the environment to perform the best possible correction
on two and three dimensional quantum systems. Depending on the dimension we
show that the enta... | 1004.0497v1 |
2010-04-09 | Validity of Landauer's principle in the quantum regime | We demonstrate the validity of Landauer's erasure principle in the strong
coupling quantum regime by treating the system-reservoir interaction in a
consistent way. We show that the initial coupling to the reservoir modifies
both energy and entropy of the system and provide explicit expressions for the
latter in the cas... | 1004.1599v1 |
2010-04-22 | Critical exponent for damped wave equations with nonlinear memory | We consider the Cauchy problem in $\mathbb{R}^n,$ $n\geq 1,$ for a semilinear
damped wave equation with nonlinear memory. Global existence and asymptotic
behavior as $t\rightarrow\infty$ of small data solutions have been established
in the case when $1\leq n\leq3.$ Moreover, we derive a blow-up result under
some positi... | 1004.3850v4 |
2010-04-27 | Radiation Damping in a Non-Abelian Strongly-Coupled Gauge Theory | We study a `dressed' or `composite' quark in strongly-coupled N=4
super-Yang-Mills (SYM), making use of the AdS/CFT correspondence. We show that
the standard string dynamics nicely captures the physics of the quark and its
surrounding quantum non-Abelian field configuration, making it possible to
derive a relativistic ... | 1004.4912v1 |
2010-05-21 | Quantization of the Damped Harmonic Oscillator Revisited | We return to the description of the damped harmonic oscillator by means of a
closed quantum theory with a general assessment of previous works, in
particular the Bateman-Caldirola-Kanai model and a new model recently proposed
by one of the authors. We show the local equivalence between the two models and
argue that lat... | 1005.4096v1 |
2010-06-09 | Dispersion and damping of two-dimensional dust acoustic waves: Theory and Simulation | A two-dimensional generalized hydrodynamics (GH) model is developed to study
the full spectrum of both longitudinal and transverse dust acoustic waves (DAW)
in strongly coupled complex (dusty) plasmas, with memory-function-formalism
being implemented to enforce high-frequency sum rules. Results are compared
with earlie... | 1006.1799v1 |
2010-07-01 | Finite time extinction by nonlinear damping for Schrodinger equation | We consider the Schrodinger equation on a compact manifold, in the presence
of a nonlinear damping term, which is homogeneous and sublinear. For initial
data in the energy space, we construct a weak solution, defined for all
positive time, which is shown to be unique. In the one-dimensional case, we
show that it become... | 1007.0077v2 |
2010-07-07 | Spin drag Hall effect in a rotating Bose mixture | We show that in a rotating two-component Bose mixture, the spin drag between
the two different spin species shows a Hall effect. This spin drag Hall effect
can be observed experimentally by studying the out-of-phase dipole mode of the
mixture. We determine the damping of this mode due to spin drag as a function
of temp... | 1007.1088v1 |
2010-08-30 | Synthesis of electrical networks interconnecting PZT actuators to damp mechanical vibrations | This paper proves that it is possible to damp mechanical vibrations of some
beam frames by means of piezoelectric actuators interconnected via passive
networks. We create a kind of electromechanical wave guide where the electrical
velocity group equals the mechanical one thus enabling an electromechanical
energy transf... | 1008.5112v1 |
2010-09-09 | The Damped String Problem Revisited | We revisit the damped string equation on a compact interval with a variety of
boundary conditions and derive an infinite sequence of trace formulas
associated with it, employing methods familiar from supersymmetric quantum
mechanics. We also derive completeness and Riesz basis results (with
parentheses) for the associa... | 1009.1858v1 |
2010-09-15 | Anomalous High-Energy Spin Excitations in La2CuO4 | Inelastic neutron scattering is used to investigate the collective magnetic
excitations of the high-temperature superconductor parent antiferromagnet
La2CuO4. We find that while the lower energy excitations are well described by
spin-wave theory, including one- and two-magnon scattering processes, the
high-energy spin ... | 1009.2915v1 |
2010-10-05 | Damping of dHvA oscillations and vortex-lattice disorder in the peak-effect region of strong type-II superconductors | The phenomenon of magnetic quantum oscillations in the superconducting state
poses several questions that still defy satisfactory answers. A key
controversial issue concerns the additional damping observed in the vortex
state. Here, we show results of \mu SR, dHvA, and SQUID magnetization
measurements on borocarbide su... | 1010.0929v1 |
2010-10-21 | Classical behavior of strongly correlated Fermi systems near a quantum critical point. Transport properties | The low-temperature kinetics of the strongly correlated electron liquid
inhabiting a solid is analyzed. It is demonstrated that a softly damped branch
of transverse zero sound emerges when several bands cross the Fermi surface
simultaneously near a quantum critical point at which the density of states
diverges. Suppres... | 1010.4547v1 |
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