abstract stringlengths 3 192k | title stringlengths 4 857 |
|---|---|
we present an overview of the onetep program for linear-scaling density functional theory (dft) calculations with large basis set (plane-wave) accuracy on parallel computers. the dft energy is computed from the density matrix, which is constructed from spatially localized orbitals we call non-orthogonal generalized wan... | the onetep linear-scaling density functional theory program |
it is known that any nondegenerate lagrangian containing time derivative terms higher than first order suffers from the ostrogradsky instability, pathological excitation of positive and negative energy degrees of freedom. we show that, within the framework of analytical mechanics of point particles, any lagrangian for ... | third order equations of motion and the ostrogradsky instability |
we investigate the single-photon scattering spectra of a giant atom coupled to a one-dimensional waveguide via multiple connection points or a continuous coupling region. using a full quantum mechanical method, we obtain the general analytic expressions for the single-photon scattering coefficients, which are valid in ... | coherent single-photon scattering spectra for a giant-atom waveguide-qed system beyond the dipole approximation |
we review concepts and methods associated with quantum discord and related topics. we also describe their possible connections with other aspects of quantum information and beyond, including quantum communication, quantum computation, many-body physics, and open quantum dynamics. quantum discord in the multiparty regim... | quantum discord and its allies: a review of recent progress |
the leggett-garg inequality, an analogue of bell's inequality involving correlations of measurements on a system at different times, stands as one of the hallmark tests of quantum mechanics against classical predictions. the phenomenon of neutrino oscillations should adhere to quantum-mechanical predictions and provide... | violation of the leggett-garg inequality in neutrino oscillations |
we consider a finite-time quantum otto cycle with single- and two spin-1 /2 systems as its working medium. to mimic adiabatic dynamics at a finite time, we employ a shortcut-to-adiabaticity technique and evaluate the performance of the engine including the cost of the shortcut. we compare our results with the true adia... | spin quantum heat engines with shortcuts to adiabaticity |
the modulation and engineering of the free-electron wave function bring new ingredients to the electron-matter interaction. we consider the dynamics of a free-electron passing by a two-level system fully quantum mechanically and study the enhancement of interaction from the modulation of the free-electron wave function... | quantum entanglement and modulation enhancement of free-electron-bound-electron interaction |
we study a (1 +1 )-dimensional quantum circuit consisting of haar-random unitary gates and projective measurements, both of which conserve a total u (1 ) charge and thus have u (1 ) symmetry. in addition to a measurement-induced entanglement transition between a volume-law and an area-law entangled phase, we find a pha... | charge fluctuation and charge-resolved entanglement in a monitored quantum circuit with u (1 ) symmetry |
the initial conditions of our universe appear to us in the form of a classical probability distribution that we probe with cosmological observations. in the current leading paradigm, this probability distribution arises from a quantum mechanical wavefunction of the universe. here we ask what the imprint of quantum mech... | cutting cosmological correlators |
recent applications of machine-learned normalizing flows to sampling in lattice field theory suggest that such methods may be able to mitigate critical slowing down and topological freezing. however, these demonstrations have been at the scale of toy models, and it remains to be determined whether they can be applied t... | aspects of scaling and scalability for flow-based sampling of lattice qcd |
the validity of just a few physical conditions comprising the einstein equivalence principle (eep) suffices to ensure that gravity can be understood as spacetime geometry. the eep is therefore subject to ongoing experimental verification, with present-day tests reaching the regime in which quantum mechanics becomes rel... | quantum formulation of the einstein equivalence principle |
dynamics of large complex systems, such as relaxation towards equilibrium in classical statistical mechanics, often obeys a master equation that captures essential information from the complexities. here, we find that thermalization of an isolated many-body quantum state can be described by a master equation. we observ... | detailed balance of thermalization dynamics in rydberg-atom quantum simulators |
hydrodynamics is the low-energy effective field theory of any interacting quantum theory, capturing the long-wavelength fluctuations of an equilibrium gibbs densitymatrix. conventionally, one views the effective dynamics in terms of the conserved currents, which should be expressed via the constitutive relations in ter... | adiabatic hydrodynamics: the eightfold way to dissipation |
irreversibility is one of the most intriguing concepts in physics. while microscopic physical laws are perfectly reversible, macroscopic average behavior has a preferred direction of time. according to the second law of thermodynamics, this arrow of time is associated with a positive mean entropy production. using a nu... | irreversibility and the arrow of time in a quenched quantum system |
the carnot statement of the second law of thermodynamics poses an upper limit on the efficiency of all heat engines. recently, it has been studied whether generic quantum features such as coherence and quantum entanglement could allow for quantum devices with efficiencies larger than the carnot efficiency. the present ... | thermodynamic universality of quantum carnot engines |
we consider the estimation of noise parameters in a quantum channel, assuming the most general strategy allowed by quantum mechanics. this is based on the exploitation of unlimited entanglement and arbitrary quantum operations, so that the channel inputs may be interactively updated. in this general scenario, we draw a... | ultimate precision of adaptive noise estimation |
continuous weak measurement allows localizing open quantum systems in state space and tracing out their quantum trajectory as they evolve in time. efficient quantum measurement schemes have previously enabled recording quantum trajectories of microwave photon and qubit states. we apply these concepts to a macroscopic m... | observing and verifying the quantum trajectory of a mechanical resonator |
indistinguishability of particles is a fundamental principle of quantum mechanics. for all elementary and quasiparticles observed to date - including fermions, bosons, and abelian anyons - this principle guarantees that the braiding of identical particles leaves the system unchanged. however, in two spatial dimensions,... | non-abelian braiding of graph vertices in a superconducting processor |
to understand the typical dynamics of an open quantum system in continuous time, we introduce an ensemble of random lindblad operators, which generate completely positive markovian evolution in the space of the density matrices. the spectral properties of these operators, including the shape of the eigenvalue distribut... | universal spectra of random lindblad operators |
the study shows that presence of the quantum coherent, unitary component of the evolution of the system can improve constancy of heat engines, i.e., decrease fluctuations of the output power, in comparison with purely stochastic setups. this enables us to overcome the recently derived trade-off between efficiency, powe... | coherence-enhanced constancy of a quantum thermoelectric generator |
the electronic character of photoexcited molecules can abruptly change at avoided crossings and conical intersections. here, we report direct mapping of the coupled interplay between electrons and nuclei in a prototype molecule, iodine monobromide (ibr), by using attosecond transient absorption spectroscopy. a few-femt... | direct mapping of curve-crossing dynamics in ibr by attosecond transient absorption spectroscopy |
a large spatial quantum superposition of size o (1 -10 )μ m for mass m ∼10−17-10−14 kg is required to probe the foundations of quantum mechanics and test the classical and quantum nature of gravity via entanglement in a laboratory. in this paper, we will show that it is possible to accelerate the two spin states of a m... | catapulting towards massive and large spatial quantum superposition |
infrared photodetectors (irpds) have become important devices in various applications such as night vision, military missile tracking, medical imaging, industry defect imaging, environmental sensing, and exoplanet exploration. mature semiconductor technologies such as mercury cadmium telluride and iii-v material-based ... | emerging technologies for high performance infrared detectors |
understanding how hydrodynamic behaviour emerges from the unitary evolution of the many-particle schrödinger equation is a central goal of non-equilibrium statistical mechanics. in this work we implement a digital simulation of the discrete time quantum dynamics of a spin-1/2 xxz spin chain on a noisy near-term quantum... | evidence of kardar-parisi-zhang scaling on a digital quantum simulator |
starting with a four-dimensional gauge theory approach to rational, elliptic, and trigonometric solutions of the yang-baxter equation, we determine the corresponding quantum group deformations to all orders in $\hbar$ by deducing their rtt presentations. the arguments we give are a mix of familiar ones with reasoning t... | gauge theory and integrability, ii |
mechanical resonators based on low-dimensional materials are promising for force and mass sensing experiments. the force sensitivity in these ultra-light resonators is often limited by the imprecision in the measurement of the vibrations, the fluctuations of the mechanical resonant frequency and the heating induced by ... | force sensitivity of multilayer graphene optomechanical devices |
we show how to perform accurate, nonperturbative and controlled calculations in quantum field theory in d dimensions. we use the truncated conformal space approach, a hamiltonian method which exploits the conformal structure of the uv fixed point. the theory is regulated in the ir by putting it on a sphere of a large f... | truncated conformal space approach in d dimensions: a cheap alternative to lattice field theory? |
the spreading of quantum information in closed systems, often termed scrambling, is a hallmark of many-body quantum dynamics. in open systems, scrambling competes with noise, errors, and decoherence. here, we provide a universal framework that describes the scrambling of quantum information in open systems: we predict ... | operator growth in open quantum systems |
we construct an exact map between a tight-binding model on any bipartite lattice in the presence of dephasing noise and a hubbard model with imaginary interaction strength. in one dimension, the exact many-body liouvillian spectrum can be obtained by application of the bethe ansatz method. we find that both the nonequi... | exact bethe ansatz spectrum of a tight-binding chain with dephasing noise |
quantum coherence is a fundamental feature of quantum mechanics and an underlying requirement for most quantum information tasks. in the resource theory of coherence, incoherent states are diagonal with respect to a fixed orthonormal basis; i.e., they can be seen as arising from a von neumann measurement. here, we intr... | resource theory of coherence based on positive-operator-valued measures |
we develop a systematic effective field theory of hydrodynamics for many-body systems on the lattice with global continuous non-abelian symmetries. models with continuous non-abelian symmetries are ubiquitous in physics, arising in diverse settings ranging from hot nuclear matter to cold atomic gases and quantum spin c... | hydrodynamics in lattice models with continuous non-abelian symmetries |
the analogy between an equilibrium partition function and the return probability in many-body unitary dynamics has led to the concept of dynamical quantum phase transition (dqpt). dqpts are defined by nonanalyticities in the return amplitude and are present in many models. in some cases, dqpts can be related to equilib... | entanglement view of dynamical quantum phase transitions |
quantum systems subject to driving and dissipation display distinctive non-equilibrium phenomena relevant to condensed matter, quantum optics, metrology and quantum error correction. an example is the emergence of phase transitions with uniquely quantum properties, which opposes the intuition that dissipation generally... | characterizing a non-equilibrium phase transition on a quantum computer |
in the present study, the improved screened kratzer potential (iskp) is investigated in the presence of external magnetic and aharanov-bohm (ab) fields within the framework of non-relativistic quantum mechanics. the schrodinger equation is solved via the nikiforov-uvarov functional analysis (nufa) method and the energy... | energy spectra and thermal properties of diatomic molecules in the presence of magnetic and ab fields with improved kratzer potential |
we use dirac's method for the quantization of constrained systems in order to quantize a spatially flat friedmann-lemaître-robertson-walker spacetime in the context of f(q) cosmology. when the coincident gauge is considered, the resulting minisuperspace system possesses second class constraints. this distinguishes the ... | quantum cosmology in f(q) theory |
we study the nonequilibrium phase diagram and the dynamical phase transitions occurring during the prethermalization of nonintegrable quantum spin chains, subject to either quantum quenches or linear ramps of a relevant control parameter. we consider spin systems in which long-range ferromagnetic interactions compete w... | impact of nonequilibrium fluctuations on prethermal dynamical phase transitions in long-range interacting spin chains |
in noninteracting isolated quantum systems out of equilibrium, local subsystems typically relax to nonthermal stationary states. in the standard framework, information on the rest of the system is discarded, and such states are described by a generalized gibbs ensemble (gge), maximizing the entropy while respecting the... | generalized deep thermalization for free fermions |
clay minerals retain or adsorb metal ions in the earth's critical zone. rocks, sediments and soils rich in clay minerals can concentrate rare earth elements (rees) in ion adsorption-type deposits (iads) and are similarly effective at metallic contaminant remediation. however, the molecular-scale chemical and physical m... | molecular-level understanding of metal ion retention in clay-rich materials |
two different heat-transport mechanisms are discussed in solids. in crystals, heat carriers propagate and scatter particlelike as described by peierls's formulation of the boltzmann transport equation for phonon wave packets. in glasses, instead, carriers behave wavelike, diffusing via a zener-like tunneling between qu... | wigner formulation of thermal transport in solids |
the possibility of observing many-body localization of ultracold atoms in a one-dimensional optical lattice is discussed for random interactions. in the noninteracting limit, such a system reduces to single-particle physics in the absence of disorder, i.e., to extended states. in effect, the observed localization is in... | many-body localization due to random interactions |
we propose and theoretically investigate a nanomechanical heat engine. we show how a levitated nanoparticle in an optical trap inside a cavity can be used to realize a stirling cycle in the underdamped regime. the all-optical approach enables fast and flexible control of all thermodynamical parameters and the efficient... | all-optical nanomechanical heat engine |
tremendous research efforts have been invested in exploring and designing so-called shortcuts to adiabaticity. these are finite-time processes that produce the same final states that would result from infinitely slow driving. most of these techniques rely on auxiliary fields and quantum control, which makes them rather... | thermodynamic control —an old paradigm with new applications |
the nlts (no low-energy trivial state) conjecture of freedman and hastings [2014] posits that there exist families of hamiltonians with all low energy states of non-trivial complexity (with complexity measured by the quantum circuit depth preparing the state). we prove this conjecture by showing that the recently disco... | nlts hamiltonians from good quantum codes |
the first part of these lecture notes is mostly devoted to a comparative discussion of the three basic large $n$ limits, which apply to fields which are vectors, matrices, or tensors of rank three and higher. after a brief review of some physical applications of large $n$ limits, we present a few solvable examples in z... | tasi lectures on large $n$ tensor models |
we present the entropic uncertainty relations for multiple measurement settings which demonstrate the uncertainty principle of quantum mechanics. those uncertainty relations are obtained for both cases with and without the presence of quantum memory, and can be proven by a unified method. our results recover some well ... | entropic uncertainty relations for multiple measurements |
recent results suggest that flow-based algorithms may provide efficient sampling of field distributions for lattice field theory applications, such as studies of quantum chromodynamics and the schwinger model. in this work, we provide a numerical demonstration of robust flow-based sampling in the schwinger model at the... | flow-based sampling in the lattice schwinger model at criticality |
in this paper, we apply the form factor bootstrap approach to branch point twist fields in the q-state potts model for q ≤ 3. for q = 3 this is an integrable interacting quantum field theory with an internal discrete &z;3 symmetry and therefore provides an ideal starting point for the investigation of the symmetry reso... | entanglement of the 3-state potts model via form factor bootstrap: total and symmetry resolved entropies |
self-organized synchronization is a ubiquitous collective phenomenon, in which each unit adjusts their rhythms to achieve synchrony through mutual interactions. the optomechanical systems, due to their inherently engineerable nonlinearities, provide an ideal platform to study self-organized synchronization. here, we de... | self-organized synchronization of phonon lasers |
in nature, instances of synchronisation abound across a diverse range of environments. in the quantum regime, however, synchronisation is typically observed by identifying an appropriate parameter regime in a specific system. in this work we show that this need not be the case, identifying conditions which, when satisf... | quantum synchronisation enabled by dynamical symmetries and dissipation |
we argue that a quantum annealer at very long annealing times is likely to experience a quasistatic evolution, returning a final population that is close to a boltzmann distribution of the hamiltonian at a single (freeze-out) point during the annealing. such a system is expected to correlate with classical algorithms t... | searching for quantum speedup in quasistatic quantum annealers |
despite their inherently non-equilibrium nature, living systems can self-organize in highly ordered collective states that share striking similarities with the thermodynamic equilibrium phases of conventional condensed-matter and fluid systems. examples range from the liquid-crystal-like arrangements of bacterial colon... | ferromagnetic and antiferromagnetic order in bacterial vortex lattices |
the emergence of superdiffusive spin dynamics in integrable classical and quantum magnets is well established by now, but there is no generally valid theoretical explanation for this phenomenon. a fundamental difficulty is that the hydrodynamic fluctuations of conserved quasiparticle modes are purely diffusive. we argu... | kardar-parisi-zhang universality from soft gauge modes |
structural hierarchy is found in myriad biological systems and has improved man-made structures ranging from the eiffel tower to optical cavities. in mechanical resonators whose rigidity is provided by static tension, structural hierarchy can reduce the dissipation of the fundamental mode to ultralow levels due to an u... | hierarchical tensile structures with ultralow mechanical dissipation |
we propose a quantum harmonic oscillator measurement engine fueled by simultaneous quantum measurements of the noncommuting position and momentum quadratures of the quantum oscillator. the engine extracts work by moving the harmonic trap suddenly, conditioned on the measurement outcomes. we present two protocols for wo... | efficiently fueling a quantum engine with incompatible measurements |
in this paper, we study the pxp hamiltonian with an external magnetic field that exhibits both quantum scar states and quantum criticality. it is known that this model hosts a series of quantum many-body scar states violating quantum thermalization at zero magnetic field, and it also exhibits an ising quantum phase tra... | quantum many-body scars and quantum criticality |
in this paper, we study the krylov complexity (k) from the planar/inflationary patch of the de sitter space using the two mode squeezed state formalism in the presence of an effective field having sound speed . from our analysis, we obtain the explicit behavior of krylov complexity (k) and lancoz coefficients () with r... | c{\\cal c}osmological k{\\cal k}rylov c{\\cal c}omplexity |
local constraint is closely related to the gauge field, so constrained models are usually effective low energy descriptions and important in condensed matter physics. on the other hand, local restriction hinders the application of numerical algorithms. in addition to the computational difficulties of the constraints, t... | global scheme of sweeping cluster algorithm to sample among topological sectors |
2d perovskites, due to their unique properties and reduced dimension, are promising candidates for future optoelectronic devices. however, the development of stable and nontoxic 2d wide‑bandgap perovskites remains a challenge. 2d all‑inorganic perovskite sr2nb3o10 (sno) nanosheets with thicknesses down to 1.8 nm are sy... | 2d perovskite sr2nb3o10 for high‑performance uv photodetectors |
nonlinear wave-matter interactions may give rise to solitons, phenomena that feature inherent stability in wave propagation and unusual spectral characteristics. solitons have been created in a variety of physical systems and have had important roles in a broad range of applications, including communications, spectrosc... | optomechanical dissipative solitons |
we study the role of long-range interactions (more precisely, the long-range superconducting gap term) on the nonequilibrium dynamics considering a long-range p -wave superconducting chain in which the superconducting term decays with distance between two sites in a power-law fashion characterized by an exponent α . we... | probing the role of long-range interactions in the dynamics of a long-range kitaev chain |
we consider a model of dirac fermions in 2 +1 dimensions with dynamically generated, anticommuting so(3) néel and z2 kekulé mass terms that permits sign-free quantum monte carlo simulations. the phase diagram is obtained from finite-size scaling and includes a direct and continuous transition between the néel and kekul... | dirac fermions with competing orders: non-landau transition with emergent symmetry |
we elucidate the deep connection between the pxp model, which is a standard model of quantum many-body scars, and the affleck-kennedy-lieb-tasaki (aklt) hamiltonian. using the framework of embedded hamiltonians, we establish the connection between the pxp hamiltonian and the aklt hamiltonian, which clarifies the reason... | connection between quantum-many-body scars and the affleck-kennedy-lieb-tasaki model from the viewpoint of embedded hamiltonians |
we discuss several classes of integrable floquet systems, i.e. systems which do not exhibit chaotic behavior even under a time dependent perturbation. the first class is associated with finite-dimensional lie groups and infinite-dimensional generalization thereof. the second class is related to the row transfer matrice... | integrable floquet dynamics |
we consider a class of quantum field theories and quantum mechanics, which we couple to &z;n topological qfts, in order to classify non-perturbative effects in the original theory. the &z;n tqft structure arises naturally from turning on a classical background field for a &z;n 0- or 1-form global symmetry. in su(n) yan... | strongly coupled qft dynamics via tqft coupling |
we investigate the trade-off between information gain and disturbance for von neumann measurements on spin-1/2 particles, and derive the measurement pointer state that saturates this trade-off, which turns out to be highly unusual. we apply this result to the question of whether the nonlocality of a single particle fro... | multiple observers can share the nonlocality of half of an entangled pair by using optimal weak measurements |
computational study of molecules and materials from first principles is a cornerstone of physics, chemistry, and materials science, but limited by the cost of accurate and precise simulations. in settings involving many simulations, machine learning can reduce these costs, often by orders of magnitude, by interpolating... | representations of molecules and materials for interpolation of quantum-mechanical simulations via machine learning |
the growing amount of data that is generated every year creates an urgent need for new and improved data storage methods. nanomaterials, which have unique mechanical, electronic and optical properties owing to the strong confinement of electrons, photons and phonons at the nanoscale, are enabling the development of dis... | nanomaterials for optical data storage |
we use a reservoir engineering technique based on two-tone driving to generate and stabilize a quantum squeezed state of a micron-scale mechanical oscillator in a microwave optomechanical system. using an independent backaction-evading measurement to directly quantify the squeezing, we observe 4.7 ±0.9 db of squeezing ... | quantum nondemolition measurement of a quantum squeezed state beyond the 3 db limit |
mechanical resonators are ubiquitous in modern information technology. with the possibility of coupling them to electromagnetic and plasmonic modes, they hold promise as the key building blocks in future quantum information technology. graphene-based resonators are of interest for technological applications due to thei... | dynamical strong coupling and parametric amplification of mechanical modes of graphene drums |
the laws of thermodynamics require any initial macroscopic inhomogeneity in extended many-body systems to be smoothed out by the time evolution through the activation of transport processes. in generic quantum systems, transport is expected to be governed by a diffusion law, whereas a sufficiently strong quenched disor... | suppression of transport in nondisordered quantum spin chains due to confined excitations |
out-of-time-order correlators (otocs) have become established as a tool to characterise quantum information dynamics and thermalization in interacting quantum many-body systems. it was recently argued that the expected exponential growth of the otoc is connected to the existence of correlations beyond those encoded in ... | out-of-time-order correlations and the fine structure of eigenstate thermalization |
the generalized uncertainty principle and the related minimum length are normally considered in non-relativistic quantum mechanics. extending it to relativistic theories is important for having a lorentz invariant minimum length and for testing the modified heisenberg principle at high energies. in this paper, we formu... | relativistic generalized uncertainty principle |
inspired by the idea that quantum computers can be useful in advancing basic science, we use a quantum processor to experimentally validate a number of theoretical results in non-equilibrium quantum thermodynamics, that were not (or were very little) corroborated so far. in order to do so, we first put forward a novel ... | experimental verification of fluctuation relations with a quantum computer |
competition between unitary dynamics that scrambles quantum information nonlocally and local measurements that probe and collapse the quantum state can result in a measurement-induced entanglement phase transition. here we study this phenomenon in an analytically tractable all-to-all brownian hybrid circuit model compo... | measurement-induced purification in large-n hybrid brownian circuits |
energy storage is a basic physical process with many applications. when considering this task at the quantum scale, it becomes important to optimise the non-equilibrium dynamics of energy transfer to the storage device or battery. here, we tackle this problem using the methods of quantum feedback control. specifically,... | charging a quantum battery with linear feedback control |
a quantum phase transition is generally thought to imprint distinctive characteristics on the nonequilibrium dynamics of a closed quantum system. specifically, the loschmidt echo after a sudden quench to a quantum critical point—measuring the time dependence of the overlap between initial and time-evolved states—is exp... | loschmidt echo revivals: critical and noncritical |
recently, a thermodynamic uncertainty relation (tur) has been formulated for classical markovian systems demonstrating trade-off between precision (current fluctuation) and cost (dissipation). systems that violate the tur are interesting as they overcome another trade-off relation concerning the efficiency of a heat en... | thermodynamic uncertainty relation in quantum thermoelectric junctions |
composing higher auxiliary-spin transfer matrices and their derivatives, we construct a family of quasilocal conserved operators of isotropic heisenberg spin-1 /2 chain and rigorously establish their linear independence from the well-known set of local conserved charges. | quasilocal conserved operators in the isotropic heisenberg spin-1 /2 chain |
we study nonequilibrium dynamics of integrable and nonintegrable closed quantum systems whose unitary evolution is interrupted with stochastic resets, characterized by a reset rate r , that project the system to its initial state. we show that the steady-state density matrix of a nonintegrable system, averaged over the... | quantum dynamics with stochastic reset |
quantum phenomena are typically observable at length and time scales smaller than those of our everyday experience, often involving individual particles or excitations. the past few decades have seen a revolution in the ability to structure matter at the nanoscale, and experiments at the single particle level have beco... | roadmap on quantum nanotechnologies |
the notion of a dynamical quantum phase transition (dqpt) was recently introduced [heyl et al., phys. rev. lett. 110, 135704 (2013), 10.1103/physrevlett.110.135704] as the nonanalytic behavior of the loschmidt echo at critical times in the thermodynamic limit. in this work the quench dynamics in the ground state sector... | dynamical quantum phase transitions in the kitaev honeycomb model |
recent experiments on a one-dimensional chain of trapped alkali-metal atoms [bernien et al., nature (london) 551, 579 (2017), 10.1038/nature24622] have observed a quantum transition associated with the onset of period-3 ordering of pumped rydberg states. this spontaneous z3 symmetry breaking is described by a constrain... | numerical study of the chiral z3 quantum phase transition in one spatial dimension |
the application of state-of-the-art machine learning techniques to statistical physic problems has seen a surge of interest for their ability to discriminate phases of matter by extracting essential features in the many-body wavefunction or the ensemble of correlators sampled in monte carlo simulations. here we introdu... | quantum phase recognition via unsupervised machine learning |
scrambling of quantum information can conveniently be quantified by so-called out-of-time-order correlators (otocs), i.e., correlators of the type <[wτ,v ] †[wτ,v ] > , whose measurements present a formidable experimental challenge. here we report on a method for the measurement of otocs based on the so-called tw... | thermodynamics of quantum information scrambling |
"magic" is the degree to which a state cannot be approximated by clifford gates. we study mana, a measure of magic, in the ground state of the z3 potts model, and argue that it is a broadly useful diagnostic for many-body physics. in particular we find that the q =3 ground state has large mana at the model's critical p... | conformal field theories are magical |
quantum opto- and electromechanical systems interface mechanical motion with the electromagnetic modes of optical resonators and microwave circuits. the capabilities and promise of these hybrid devices have been showcased through a variety of recent experimental advances that demonstrated exquisite control over the qua... | a perspective on hybrid quantum opto- and electromechanical systems |
a long period of linear growth in the spectral form factor provides a universal diagnostic of quantum chaos at intermediate times. by contrast, the behavior of the spectral form factor in disordered integrable many-body models is not well understood. here we study the two-body sachdev-ye-kitaev model and show that the ... | exponential ramp in the quadratic sachdev-ye-kitaev model |
although two-dimensional (2d) materials have attracted considerable research interest for use in the development of innovative wearable optoelectronic systems, the integrated optoelectronic performance of 2d materials photodetectors, including flexibility, transparency, broadband response and stability in air, remains ... | flexible, transparent and ultra-broadband photodetector based on large-area wse2 film for wearable devices |
considerable advances made in the development of nanomechanical and nano-optomechanical devices have enabled the observation of quantum effects, improved sensitivity to minute forces, and provided avenues to probe fundamental physics at the nanoscale. concurrently, solid-state quantum emitters with optically accessible... | multi-dimensional single-spin nano-optomechanics with a levitated nanodiamond |
raman spectroscopy of transition metal dichalcogenides (tmds) is reviewed based on our recent theoretical and experimental works. first, we discuss the semi-classical and quantum mechanical description for the polarization dependence of raman spectra of tmds in which the optical dipole transition matrix elements as a f... | raman spectroscopy of transition metal dichalcogenides |
we present a gauge-invariant effective action for the abelian-higgs model (scalar electrodynamics) with a chemical potential μ on a (1 +1 )-dimensional lattice. this formulation provides an expansion in the hopping parameter κ which we test with monte carlo simulations for a broad range of the inverse gauge coupling βp... | gauge-invariant implementation of the abelian-higgs model on optical lattices |
classical systems containing cleverly devised combinations of loss and gain elements constitute extremely rich building units that can mimic non-hermitian properties, which conventionally are attainable in quantum mechanics only. parity-time (p t ) symmetric media, also referred to as synthetic media, have been devised... | parity-time synthetic phononic media |
the thermodynamics of quantum systems coupled to periodically modulated heat baths and work reservoirs is developed. by identifying affinities and fluxes, the first and the second law are formulated consistently. in the linear response regime, entropy production becomes a quadratic form in the affinities. specializing ... | periodic thermodynamics of open quantum systems |
we study transitionless quantum driving in an infinite-range many-body system described by the lipkin-meshkov-glick model. despite the correlation length being always infinite the closing of the gap at the critical point makes the driving hamiltonian of increasing complexity also in this case. to this aim we develop a ... | shortcut to adiabaticity in the lipkin-meshkov-glick model |
here, we demonstrate the radiative polarization of high-energy electron beams in collisions with ultrashort pulsed bichromatic laser fields. employing a boltzmann kinetic approach for the electron distribution allows us to simulate the beam polarization over a wide range of parameters and determine the optimum conditio... | ultrafast polarization of an electron beam in an intense bichromatic laser field |
we study the dynamics and stability in a strongly interacting resonantly driven two-band model. using exact numerical simulations, we find a stable regime at large driving frequencies where the time evolution is governed by a local floquet hamiltonian that is approximately conserved out to very long times. for slow dri... | heating and many-body resonances in a periodically driven two-band system |
monte carlo studies involving real time dynamics are severely restricted by the sign problem that emerges from a highly oscillatory phase of the path integral. in this letter, we present a new method to compute real time quantities on the lattice using the schwinger-keldysh formalism via monte carlo simulations. the ke... | monte carlo study of real time dynamics on the lattice |
we elucidate the relation between out-of-time-order correlators (otocs) and quantum phase transitions via analytically studying the otoc dynamics in a degenerate spectrum. our method points to key ingredients to dynamically detect quantum phases via out-of-time-order correlators for a wide range of quantum phase transi... | detection of quantum phases via out-of-time-order correlators |
frustrated magnets hold the promise of material realizations of exotic phases of quantum matter, but direct comparisons of unbiased model calculations with experimental measurements remain very challenging. here we design and implement a protocol of employing many-body computation methodologies for accurate model calcu... | kosterlitz-thouless melting of magnetic order in the triangular quantum ising material tmmggao4 |
motivated by quantum quenches in spin chains, a one-dimensional toy-model of fermionic particles evolving in imaginary-time from a domain-wall initial state is solved. the main interest of this toy-model is that it exhibits the arctic circle phenomenon, namely a spatial phase separation between a critically fluctuating... | inhomogeneous field theory inside the arctic circle |
Subsets and Splits
No community queries yet
The top public SQL queries from the community will appear here once available.