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intrinsic defects in optomechanical devices are generally viewed to be detrimental for achieving coherent amplification of phonons, and great care has thus been exercised in fabricating devices and materials with no (or a minimal number of) defects. contrary to this view, here we show that, by surpassing an exceptional... | exceptional points in random-defect phonon lasers |
motivated by recent work showing that a quantum error correcting code can be generated by hybrid dynamics of unitaries and measurements, we study the long time behavior of such systems. we demonstrate that even in the ``mixed'' phase, a maximally mixed initial density matrix is purified on a time scale equal to the hil... | how dynamical quantum memories forget |
the wave-particle duality dates back to einstein's explanation of the photoelectric effect through quanta of light and de broglie's hypothesis of matter waves. quantum mechanics uses an abstract description for the behavior of physical systems such as photons, electrons, or atoms. whether quantum predictions for single... | delayed-choice gedanken experiments and their realizations |
the majority of classical dynamical systems are chaotic and exhibit the butterfly effect: a minute change in initial conditions has exponentially large effects later on. but this phenomenon is difficult to reconcile with quantum mechanics. one of the main goals in the field of quantum chaos is to establish a correspond... | early-time exponential instabilities in nonchaotic quantum systems |
the momentum carried by structured light fields exhibits a rich array of surprising features. in this work, we generate transverse orbital angular momentum (toam) in the interference field of two parallel and counter-propagating linearly-polarised focused beams, synthesising an array of identical handedness vortices ca... | structured transverse orbital angular momentum probed by a levitated optomechanical sensor |
we consider a dynamic protocol for quantum many-body systems, which enables us to study the interplay between unitary hamiltonian driving and random local projective measurements. while the unitary dynamics tends to increase entanglement, local measurements tend to disentangle, thus favoring decoherence. the competitio... | measurement-induced dynamics of many-body systems at quantum criticality |
we show that the magnetization of a single "qubit" spin weakly coupled to an otherwise isolated disordered spin chain exhibits periodic revivals in the localized regime, and retains an imprint of its initial magnetization at infinite time. we demonstrate that the revival rate is strongly suppressed upon adding interact... | quantum revivals and many-body localization |
we combine numerical diagonalization with semianalytical calculations to prove the existence of the intermediate nonergodic but delocalized phase in the anderson model on disordered hierarchical lattices. we suggest a new generalized population dynamics that is able to detect the violation of ergodicity of the delocali... | nonergodic phases in strongly disordered random regular graphs |
we theoretically study a simple non-equilibrium quantum network whose dynamics can be expressed and exactly solved in terms of a time-local master equation. specifically, we consider a pair of coupled fermionic modes, each one locally exchanging energy and particles with an independent, macroscopic thermal reservoir. w... | non-additive dissipation in open quantum networks out of equilibrium |
we study integrable spin chains and quantum and classical cellular automata with interaction range ℓ ≥3 . this is a family of integrable models for which there was no general theory so far. we develop an algebraic framework for such models, generalizing known methods from nearest-neighbor interacting chains. this leads... | integrable spin chains and cellular automata with medium-range interaction |
in this paper we further develop the fluctuating hydrodynamics proposed in [1] in a number of ways. we first work out in detail the classical limit of the hydrodynamical action, which exhibits many simplifications. in particular, this enables a transparent formulation of the action in physical spacetime in the presence... | effective field theory of dissipative fluids (ii): classical limit, dynamical kms symmetry and entropy current |
optomechanical systems in the well-resolved-sideband regime are ideal for studying a myriad of quantum phenomena with mechanical systems, including backaction-evading measurements, mechanical squeezing, and nonclassical states generation. for these experiments, the mechanical oscillator should be prepared in its ground... | laser cooling of a nanomechanical oscillator to its zero-point energy |
the grand canonical ensemble lies at the core of quantum and classical statistical mechanics. a small system thermalizes to this ensemble while exchanging heat and particles with a bath. a quantum system may exchange quantities represented by operators that fail to commute. whether such a system thermalizes and what fo... | microcanonical and resource-theoretic derivations of the thermal state of a quantum system with noncommuting charges |
inspired by recent results on the non-equilibrium dynamics of many-body quantum systems, we study the classical hard rod problem in one dimension with initial domain wall condition. hard rods are an integrable system, in the sense that for each velocity the density of particles is locally conserved. it was proven by bo... | dynamics of hard rods with initial domain wall state |
out of time ordered correlator (otoc) is recently introduced as a powerful diagnose for quantum chaos. to go beyond, here we present an analytical solution of otoc for a non-chaotic many body localized (mbl) system, showing distinct feature from quantum chaos and anderson localization (al). the otoc is found to fall on... | universal logarithmic scrambling in many body localization |
quasicrystals are long-range ordered but not periodic, representing an interesting middle ground between order and disorder. we experimentally and numerically study the localization transition in the ground state of noninteracting and weakly interacting bosons in an eightfold symmetric quasicrystalline optical lattice.... | observing localization in a 2d quasicrystalline optical lattice |
we define a notion of target space entanglement entropy. rather than partitioning the base space on which the theory is defined, we consider partitions of the target space. this is the physical case of interest for first-quantized theories, such as worldsheet string theory. we associate to each subregion of the target ... | target space entanglement entropy |
the quantum ground state of a massive mechanical system is a stepping stone for investigating macroscopic quantum states and building high fidelity sensors. with the recent achievement of ground-state cooling of a single motional mode, levitated nanoparticles have entered the quantum domain. to overcome detrimental cro... | simultaneous ground-state cooling of two mechanical modes of a levitated nanoparticle |
we explore universality and phases of matter in hybrid quantum dynamics combining chaotic time evolution and projective measurements. we develop a unitary representation of measurements based on the stinespring theorem, which we crucially identify with the time evolution of the system and measurement apparatus, affordi... | measurement-induced phases of matter require feedback |
circularly polarized light exhibits promising applications in future displays and photonic technologies. circularly polarized luminescence (cpl) from chiral luminophores is an ideal approach to directly generating circularly polarized light, in which the energy loss induced by the circularly polarized filters can be re... | circularly polarized luminescence from organic micro-/nano-structures |
lee-yang zeros are points on the complex plane of physical parameters where the partition function of a system vanishes and hence the free energy diverges. lee-yang zeros are ubiquitous in many-body systems and fully characterize their thermodynamics. notwithstanding their fundamental importance, lee-yang zeros have ne... | experimental observation of lee-yang zeros |
it has been postulated that secondary organic particulate matter plays a pivotal role in the early growth of newly formed particles in forest areas. the recently detected class of extremely low volatile organic compounds (elvoc) provides the missing organic vapors and possibly contributes a significant fraction to atmo... | formation of highly oxidized multifunctional compounds: autoxidation of peroxy radicals formed in the ozonolysis of alkenes - deduced from structure-product relationships |
the act of position measurement alters the motion of an object being measured. this quantum measurement backaction is typically much smaller than the thermal motion of a room-temperature object and thus difficult to observe. by shining laser light through a nanomechanical beam, we measure the beam’s thermally driven vi... | quantum correlations from a room-temperature optomechanical cavity |
understanding how quantum resources can be quantified and distributed over many parties has profound applications in quantum communication. as one of the most intriguing features of quantum mechanics, einstein-podolsky-rosen (epr) steering is a useful resource for secure quantum networks. by reconstructing the covarian... | demonstration of monogamy relations for einstein-podolsky-rosen steering in gaussian cluster states |
out-of-time-ordered correlators (otocs) have been proposed as a probe of chaos in quantum mechanics, on the basis of their short-time exponential growth found in some particular setups. however, it has been seen that this behavior is not universal. therefore, we query other quantum chaos manifestations arising from the... | gauging classical and quantum integrability through out-of-time-ordered correlators |
we propose and analyze a protocol to study quantum information scrambling using statistical correlations between measurements, which are performed after evolving a quantum system from randomized initial states. we prove that the resulting correlations precisely capture the so-called out-of-time-ordered correlators and ... | probing scrambling using statistical correlations between randomized measurements |
we study the slow quenching dynamics (characterized by an inverse rate τ-1) of a one-dimensional transverse ising chain with nearest neighbor ferromagentic interactions across the quantum critical point (qcp) and analyze the loschmidt overlap measured using the subsequent temporal evolution of the final wave function (... | slow quenches in a quantum ising chain: dynamical phase transitions and topology |
we derive detailed and integral quantum fluctuation theorems for heat exchange in a quantum correlated bipartite thermal system using the framework of dynamic bayesian networks. contrary to the usual two-projective-measurement scheme that is known to destroy quantum features, these fluctuation relations fully capture q... | quantum fluctuation theorems beyond two-point measurements |
quantum mechanics allows for situations where the relative order between two processes is entangled with a quantum degree of freedom. here we show that such entanglement can enhance the ability to transmit quantum information over noisy communication channels. we consider two completely dephasing channels, which in nor... | quantum communication in a superposition of causal orders |
non-hermitian hamiltonians provide an alternative perspective on the dynamics of quantum and classical systems coupled non-conservatively to an environment. once primarily an interest of mathematical physicists, the theory of non-hermitian hamiltonians has solidified and expanded to describe various physically observab... | non-hermitian physics in magnetic systems |
in floquet engineering, periodic driving is used to realize novel phases of matter that are inaccessible in thermal equilibrium. for this purpose, the floquet theory provides us a recipe for obtaining a static effective hamiltonian. although many existing works have treated closed systems, it is important to consider t... | floquet states in open quantum systems |
quantum-limited microwave parametric amplifiers are genuine key pillars for rising quantum technologies and, in general, for applications that rely on the successful readout of weak microwave signals by adding only the minimum amount of noise allowed by quantum mechanics. in this perspective, after providing a brief ov... | perspective on traveling wave microwave parametric amplifiers |
we perform a comprehensive analysis of the symmetry-resolved (sr) entanglement entropy (ee) for one single interval in the ground state of a 1 + 1d conformal field theory (cft), that is invariant under an arbitrary finite or compact lie group, g. we utilize the boundary cft approach to study the total ee, which enables... | symmetry-resolved entanglement entropy, spectra & boundary conformal field theory |
the hierarchical equations of motion (heom), derived from the exact feynman-vernon path integral, is one of the most powerful numerical methods to simulate the dynamics of open quantum systems. its applicability has so far been limited to specific forms of spectral reservoir distributions and relatively elevated temper... | taming quantum noise for efficient low temperature simulations of open quantum systems |
the transport of energy through 1-dimensional (1d) waveguiding channels can be affected by sub-wavelength disorder, resulting in undesirable localization and backscattering phenomena. however, quantized disorder-resilient transport is observable in the edge currents of 2-dimensional (2d) topological band insulators wit... | robust temporal pumping in a magneto-mechanical topological insulator |
tunnelling is one of the most fundamental manifestations of quantum mechanics. the recent advent of lightwave-driven scanning tunnelling microscopy has revolutionized ultrafast nanoscience by directly resolving electron tunnelling in electrically conducting samples on the relevant ultrashort length- and timescales. her... | subcycle contact-free nanoscopy of ultrafast interlayer transport in atomically thin heterostructures |
a definition for the entanglement entropy in a gauge theory was given recently in arxiv:1501.02593. working on a spatial lattice, it involves embedding the physical state in an extended hilbert space obtained by taking the tensor product of the hilbert space of states on each link of the lattice. this extended hilbert ... | aspects of entanglement entropy for gauge theories |
recently, quantum hall state analogs in classical mechanics attract much attention from topological points of view. topology is not only for mathematicians but also quite useful in a quantum world. further it even governs the newton’s law of motion. one of the advantages of classical systems over solid state materials ... | manipulation of dirac cones in mechanical graphene |
we introduce a method "dmt" for approximating density operators of 1d systems that, when combined with a standard framework for time evolution (tebd), makes possible simulation of the dynamics of strongly thermalizing systems to arbitrary times. we demonstrate that the method performs well for both near-equilibrium ini... | quantum dynamics of thermalizing systems |
we study the operators in the large n tensor models, focusing mostly on the fermionic quantum mechanics with o (n )3 symmetry which may be either global or gauged. in the model with global symmetry, we study the spectra of bilinear operators, which are in either the symmetric traceless or the antisymmetric representati... | spectra of operators in large n tensor models |
we investigate the dynamics of bipartite entanglement after the sudden junction of two leads in interacting integrable models. by combining the quasiparticle picture for the entanglement spreading with generalised hydrodynamics we derive an analytical prediction for the dynamics of the entanglement entropy between a fi... | entanglement evolution and generalised hydrodynamics: interacting integrable systems |
the oxygen evolution reaction (oer) is a key component to applications of electrochemistry in energy and environment, but the reaction mechanism for oer on a best-performing catalyst, the fe-doped niooh [(ni,fe)ooh], is under debate. using advanced quantum mechanics (qm) methods, we find that the (ni,fe)ooh systems fea... | synergy between fe and ni in the optimal performance of (ni,fe)ooh catalysts for the oxygen evolution reaction |
we study the real-time dynamics of a translationally invariant quantum spin chain, based on the east kinetically constrained glass model, in search for evidence of many-body localization in the absence of disorder. numerical simulations indicate a change, controlled by a coupling parameter, from a regime of fast relaxa... | dynamics of many-body localization in a translation-invariant quantum glass model |
all-inorganic cspbi3 perovskite quantum dots have received substantial research interest for photovoltaic applications because of higher efficiency compared to solar cells using other quantum dots materials and the various exciting properties that perovskites have to offer. these quantum dot devices also exhibit good m... | flexible and efficient perovskite quantum dot solar cells via hybrid interfacial architecture |
we propose a measurement theory for quantum fields based on measurements made with localized nonrelativistic systems that couple covariantly to quantum fields (like the unruh-dewitt detector). concretely, we analyze the positive operator-valued measure induced on the field when an idealized measurement is carried out o... | a detector-based measurement theory for quantum field theory |
we consider monitored quantum systems with a global conserved charge, and ask how efficiently an observer ("eavesdropper") can learn the global charge of such systems from local projective measurements. we find phase transitions as a function of the measurement rate, depending on how much information about the quantum ... | transitions in the learnability of global charges from local measurements |
the presence of noise or the interaction with an environment can radically change the dynamics of observables of an otherwise isolated quantum system. we derive a bound on the speed with which observables of open quantum systems evolve. this speed limit is divided into mandelstam and tamm's original time-energy uncerta... | unifying quantum and classical speed limits on observables |
we study the dynamics of entanglement in the scaling limit of the ising spin chain in the presence of both a longitudinal and a transverse field. we present analytical results for the quench of the longitudinal field in the critical transverse field which go beyond current lattice integrability techniques. we test thes... | entanglement oscillations near a quantum critical point |
many-body localization (mbl) has emerged as a powerful paradigm for understanding nonequilibrium quantum dynamics. folklore based on perturbative arguments holds that mbl arises only in systems with short-range interactions. here, we advance nonperturbative arguments indicating that mbl can arise in systems with long-r... | many-body localization with long-range interactions |
we present a new variational method for investigating the ground state and out of equilibrium dynamics of quantum many-body bosonic and fermionic systems. our approach is based on constructing variational wavefunctions which extend gaussian states by including generalized canonical transformations between the fields. t... | variational study of fermionic and bosonic systems with non-gaussian states: theory and applications |
atypical eigenstates in the form of quantum scars and fragmentation of hilbert space due to conservation laws provide obstructions to thermalization in the absence of disorder. in certain models with dipole and u (1 ) conservation, the fragmentation results in subdiffusive transport. in this letter we study the interpl... | anomalous hydrodynamics in a class of scarred frustration-free hamiltonians |
external monitoring of quantum many-body systems can give rise to a measurement-induced phase transition characterized by a change in behavior of the entanglement entropy from an area law to an unbounded growth. in this paper, we show that this transition extends beyond bipartite correlations to multipartite entangleme... | multipartite entanglement in the measurement-induced phase transition of the quantum ising chain |
knowledge about the electronic motion in molecules is essential for our understanding of chemical reactions and biological processes. the advent of attosecond techniques opens up the possibility to induce electronic motion, observe it in real time, and potentially steer it. a fundamental question remains the factors in... | electron dynamics upon ionization of polyatomic molecules: coupling to quantum nuclear motion and decoherence |
combining ambient pressure x-ray photoelectron spectroscopy experiments and quantum mechanical density functional theory calculations, this work reveals the essential first step for activating co2 on a cu surface, in particular, highlighting the importance of copper suboxide and the critical role of water. these findin... | subsurface oxide plays a critical role in co2 activation by cu(111) surfaces to form chemisorbed co2, the first step in reduction of co2 |
studies of disordered spin chains have recently experienced a renewed interest, inspired by the question to which extent the exact numerical calculations comply with the existence of a many-body localization phase transition. for the paradigmatic random field heisenberg spin chains, many intriguing features were observ... | phenomenology of spectral functions in disordered spin chains at infinite temperature |
nonstabilizerness, also known as magic, quantifies the number of non-clifford operations needed to prepare a quantum state. as typical measures either involve minimization procedures or a computational cost exponential in the number of qubits n , it is notoriously hard to characterize for many-body states. in this pape... | quantifying nonstabilizerness of matrix product states |
the dynamics of nonlinear systems qualitatively change depending on their parameters, which is called bifurcation. a quantum-mechanical nonlinear oscillator can yield a quantum superposition of two oscillation states, known as a schrödinger cat state, via quantum adiabatic evolution through its bifurcation point. here ... | bifurcation-based adiabatic quantum computation with a nonlinear oscillator network |
we study the entanglement entropy of eigenstates (including the ground state) of the sachdev-ye-kitaev model. we argue for a volume law, whose coefficient can be calculated analytically from the density of states. the coefficient depends on not only the energy density of the eigenstate but also the subsystem size. very... | eigenstate entanglement in the sachdev-ye-kitaev model |
we exploit the knowledge of the entanglement spectrum in the ground state of the gapped xxz spin chain to derive asymptotic exact results for the full counting statistics of the transverse magnetisation in a large spin block of length ℓ. we found that for a subsystem of even length the full counting statistics is gauss... | full counting statistics in the gapped xxz spin chain |
the out-of-time-ordered (oto) correlation is a key quantity for quantifying quantum chaoticity and has been recently used in the investigation of quantum holography. here we use it to study and characterize many-body localization (mbl). we find that a long-time logarithmic variation of the oto correlation occurs in the... | characterizing many-body localization by out-of-time-ordered correlation |
breaking the symmetry of electromagnetic wave propagation enables important technological functionality. in particular, circulators are nonreciprocal components that can route photons directionally in classical or quantum photonic circuits and offer prospects for fundamental research on electromagnetic transport. devel... | optical circulation in a multimode optomechanical resonator |
we consider how the energy cost of bit reset scales with the time duration of the protocol. bit reset necessarily takes place in finite time, where there is an extra penalty on top of the quasistatic work cost derived by landauer. this extra energy is dissipated as heat in the computer, inducing a fundamental limit on ... | universal bound on energy cost of bit reset in finite time |
by generalizing the density matrix to a transition matrix between two states, represented as $|\phi\rangle$ and $|\psi\rangle$, one can define the pseudo entropy analogous to the entanglement entropy. in this paper, we derive an operator sum rule involving the reduced transition matrix and density matrix of the superpo... | sum rule for pseudo rényi entropy |
a minimal observable length is a common feature of theories that aim to merge quantum physics and gravity. quantum mechanically, this concept is associated with a nonzero minimal uncertainty in position measurements, which is encoded in deformed commutation relations. in spite of increasing theoretical interest, the su... | probing deformed commutators with macroscopic harmonic oscillators |
using individual molecules as conducting bridges for electrons offers opportunities when investigating quantum phenomena that are not readily accessible from experiments involving ensembles of molecules. the probing of single molecules has led, over the past few decades, to the rise of molecular electronics. although s... | from molecular to supramolecular electronics |
we explore quantum and classical correlations along with coherence in the ground states of spin-1 heisenberg chains, namely the one-dimensional xxz model and the one-dimensional bilinear biquadratic model, with the techniques of density matrix renormalization group theory. exploiting the tools of quantum information th... | quantum correlations and coherence in spin-1 heisenberg chains |
the eigenstate thermalization hypothesis explains the emergence of the thermodynamic equilibrium in isolated quantum many-body systems by assuming a particular structure of the observable's matrix elements in the energy eigenbasis. schematically, it postulates that off-diagonal matrix elements are random numbers and th... | eigenstate thermalization hypothesis and its deviations from random-matrix theory beyond the thermalization time |
large n matrix quantum mechanics is central to holographic duality but not solvable in the most interesting cases. we show that the spectrum and simple expectation values in these theories can be obtained numerically via a "bootstrap" methodology. in this approach, operator expectation values are related by symmetries—... | bootstrapping matrix quantum mechanics |
unidirectional and robust transport is generally observed at the edge of two- or three-dimensional quantum hall and topological insulator systems. a hallmark of these systems is topological protection, i.e., the existence of propagative edge states that cannot be scattered by imperfections or disorder in the system. a ... | non-hermitian transparency and one-way transport in low-dimensional lattices by an imaginary gauge field |
we study causality in gravitational systems beyond the classical limit. using on-shell methods, we consider the 1-loop corrections from charged particles to the photon energy-momentum tensor — the self-stress — that controls the quantum interaction between two on-shell photons and one off-shell graviton. the self-stres... | gravitational causality and the self-stress of photons |
deterministic classical dynamical systems have an ergodic hierarchy, from ergodic through mixing, to bernoulli systems that are "as random as a coin toss." dual-unitary circuits have been recently introduced as solvable models of many-body nonintegrable quantum chaotic systems having a hierarchy of ergodic properties. ... | from dual-unitary to quantum bernoulli circuits: role of the entangling power in constructing a quantum ergodic hierarchy |
many emerging quantum technologies demand precise engineering and control over networks consisting of quantum mechanical degrees of freedom connected by propagating electromagnetic fields, or quantum input-output networks. here we review recent progress in theory and experiment related to such quantum input-output netw... | the slh framework for modeling quantum input-output networks |
we show that any heat definition expressed as an energy change in the reservoir energy plus any fraction of the system-reservoir interaction is not an exact differential when evaluated along reversible isothermal transformations, except when that fraction is zero. even in that latter case the reversible heat divided by... | nature of heat in strongly coupled open quantum systems |
we study (1 +1 )-dimensional s u (n ) spin systems in the presence of global s u (n ) rotation and lattice translation symmetries. knowing the mixed anomaly of the two symmetries at low energy, we identify, by the anomaly matching argument, a topological index for the spin model—the total number of young-tableau boxes ... | anomaly matching and symmetry-protected critical phases in s u (n ) spin systems in 1 +1 dimensions |
in one dimension, noninteracting particles can undergo a localization-delocalization transition in a quasiperiodic potential. recent studies have suggested that this transition transforms into a many-body localization (mbl) transition upon the introduction of interactions. it has also been shown that mobility edges can... | many-body localization in the presence of a single-particle mobility edge |
we introduce a general framework for thermometry based on collisional models, where ancillas probe the temperature of the environment through an intermediary system. this allows for the generation of correlated ancillas even if they are initially independent. using tools from parameter estimation theory, we show throug... | collisional quantum thermometry |
the motion of micrometre-sized mechanical resonators can now be controlled and measured at the fundamental limits imposed by quantum mechanics. these resonators have been prepared in their motional ground state or in squeezed states, measured with quantum-limited precision, and even entangled with microwave fields. suc... | faithful conversion of propagating quantum information to mechanical motion |
we propose to realize mechanical parity-time (pt ) symmetry in two coupled optomechanical systems. to provide gain to one mechanical resonator and the same amount of damping to the other, the two optical cavities should be driven by blue- and red-detuned laser fields, respectively. after adiabatically eliminating the d... | mechanical pt symmetry in coupled optomechanical systems |
electromagnetically induced transparency (eit) is a quantum interference effect arising from different transition pathways of optical fields. within the transparency window, both absorption and dispersion properties strongly change, which results in extensive applications such as slow light and optical storage. due to ... | electromagnetically induced transparency in optical microcavities |
the sachdev-ye-kitaev (syk) model is a quantum-mechanical model of fermions interacting with q -body random couplings. for q =2 , it describes free particles and is nonchaotic in the many-body sense, while for q >2 it is strongly interacting and exhibits many-body chaos. in this work we study the entanglement entrop... | quantum entanglement of the sachdev-ye-kitaev models |
levitated optomechanics is showing potential for precise force measurements. here, we report a case study to show experimentally the capacity of such a force sensor, using an electric field as a tool to detect a coulomb force applied onto a levitated nanosphere. we experimentally observe the spatial displacement of up ... | force sensing with an optically levitated charged nanoparticle |
we investigate how the presence of quantum correlations can influence work extraction in closed quantum systems, establishing a new link between the field of quantum non-equilibrium thermodynamics and the one of quantum information theory. we consider a bipartite quantum system and we show that it is possible to optimi... | daemonic ergotropy: enhanced work extraction from quantum correlations |
we introduce exactly solvable gapless quantum systems in d dimensions that support symmetry-protected topological (spt) edge modes. our construction leads to long-range entangled, critical points or phases that can be interpreted as critical condensates of domain walls "decorated" with dimension (d -1 ) spt systems. us... | gapless symmetry-protected topological order |
spontaneous collapse models predict that a weak force noise acts on any mechanical system, as a consequence of the collapse of the wave function. significant upper limits on the collapse rate have been recently inferred from precision mechanical experiments, such as ultracold cantilevers and the space mission lisa path... | improved noninterferometric test of collapse models using ultracold cantilevers |
quantum thermalization in a many-body system is defined by the approach of local subsystems toward a universal form, describable as an ensemble of quantum states wherein observables acquire thermal expectation values. recently, it has been demonstrated that the distribution of these quantum states can also exhibit univ... | dynamical purification and the emergence of quantum state designs from the projected ensemble |
recently, significant progress has been made in (2 +1 )-dimensional conformal field theories without supersymmetry. in particular, it was realized that different lagrangians may be related by hidden dualities; i.e., seemingly different field theories may actually be identical in the infrared limit. among all the propos... | duality between the deconfined quantum-critical point and the bosonic topological transition |
the finite-time dynamics, apart from its fundamental importance in nonequilibrium thermodynamics, is of great significance in designing heat engine cycles. we build an experimental apparatus to test the predicted long-time 1 /τ scaling of the irreversible entropy generation in the finite-time (τ ) thermodynamic process... | experimental test of the 1 /τ -scaling entropy generation in finite-time thermodynamics |
coherence, the stability of the relative phase between quantum states, is central to quantum mechanics and its applications. for ultracold dipolar molecules at sub-microkelvin temperatures, internal states with robust coherence are predicted to offer rich prospects for quantum many-body physics and quantum information ... | second-scale nuclear spin coherence time of ultracold 23na40k molecules |
within the wave-packet semiclassical approach, the bloch electron energy is derived to second order in the magnetic field and classified into gauge-invariant terms with clear physical meaning, yielding a fresh understanding of the complex behavior of orbital magnetic susceptibility. the berry curvature and quantum metr... | geometrical effects in orbital magnetic susceptibility |
we study numerically and analytically the quench dynamics of isolated many-body quantum systems. using full random matrices from the gaussian orthogonal ensemble, we obtain analytical expressions for the evolution of the survival probability, density imbalance, and out-of-time-ordered correlator. they are compared with... | generic dynamical features of quenched interacting quantum systems: survival probability, density imbalance, and out-of-time-ordered correlator |
random quantum circuits have played a central role in establishing the computational advantages of near-term quantum computers over their conventional counterparts. here, we use ensembles of low-depth random circuits with local connectivity in d ≥1 spatial dimensions to generate quantum error-correcting codes. for rand... | quantum coding with low-depth random circuits |
demonstrating a device that efficiently connects light, motion, and microwaves is an outstanding challenge in classical and quantum photonics. we make significant progress in this direction by demonstrating a photonic crystal resonator on thin-film lithium niobate (ln) that simultaneously supports high-$q$ optical and ... | lithium niobate piezo-optomechanical crystals |
in a seminal paper [d. n. page, phys. rev. lett. 71, 1291 (1993), 10.1103/physrevlett.71.1291], page proved that the average entanglement entropy of subsystems of random pure states is save≃ln da-(1 /2 )da2/d for 1 ≪da≤√{d }, where da and d are the hilbert space dimensions of the subsystem and the system, respectively.... | entanglement entropy of eigenstates of quadratic fermionic hamiltonians |
we investigate various aspects of the lanczos coefficients in a family of free lifshitz scalar theories, characterized by their integer dynamical exponent, at finite temperature. in this non-relativistic setup, we examine the effects of mass, finite ultraviolet cutoff, and finite lattice spacing on the behavior of the ... | krylov complexity in lifshitz-type scalar field theories |
quantitative and well-targeted design of modern alloys is extremely challenging due to their immense compositional space. when considering only 50 elements for compositional blending the number of possible alloys is practically infinite, as is the associated unexplored property realm. in this paper, we present a simple... | engineering atomic-level complexity in high-entropy and complex concentrated alloys |
we derive a dynamical equation that describes the exact time evolution in generic (inhomogeneous) noninteracting spin-chain models. assuming quasistationarity, we develop a (generalized) hydrodynamic theory. the question at hand is whether some large-time corrections are captured by higher-order hydrodynamics. we consi... | higher-order generalized hydrodynamics in one dimension: the noninteracting test |
we investigate both pure and mixed states floquet dynamical quantum phase transition (dqpt) in the periodically time-dependent extended xy model. we exactly show that the proposed floquet hamiltonian of interacting spins can be expressed as a sum of noninteracting quasispins imposed by an effective time dependent magne... | floquet dynamical quantum phase transition in the extended xy model: nonadiabatic to adiabatic topological transition |
we investigate the interplay between unitary and nonunitary dynamics after a quantum quench in a noninteracting fermionic chain. in particular, we consider the effect of localized loss processes, for which fermions are added and removed incoherently at the center of the chain. we focus on the hydrodynamic limit of larg... | noninteracting fermionic systems with localized losses: exact results in the hydrodynamic limit |
the prediction of quantum mechanical properties is historically plagued by a trade-off between accuracy and speed. machine learning potentials have previously shown great success in this domain, reaching increasingly better accuracy while maintaining computational efficiency comparable with classical force fields. in t... | torchmd-net: equivariant transformers for neural network based molecular potentials |
we investigate the symmetry resolution of entanglement in the presence of long-range couplings. to this end, we study the symmetry-resolved entanglement entropy in the ground state of a fermionic chain that has dimerised long-range hoppings with power-like decaying amplitude-a long-range generalisation of the su-schrie... | symmetry-resolved entanglement in a long-range free-fermion chain |
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