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prethermalization has been extensively studied in systems close to integrability. we propose a more general, yet conceptually simpler, setup for this phenomenon. we consider a—possibly nonintegrable—reference dynamics, weakly perturbed so that the perturbation breaks at least one conservation law of the reference dynam... | prethermalization and thermalization in isolated quantum systems |
quantum teleportation, the faithful transfer of an unknown input state onto a remote quantum system1, is a key component in long-distance quantum communication protocols2 and distributed quantum computing3,4. at the same time, high-frequency nano-optomechanical systems5 hold great promise as nodes in a future quantum n... | optomechanical quantum teleportation |
we numerically study an anyon chain based on the haagerup fusion category and find evidence that it leads in the long-distance limit to a conformal field theory whose central charge is ∼2 . fusion categories generalize the concept of finite group symmetries to noninvertible symmetry operations, and the haagerup fusion ... | numerical evidence for a haagerup conformal field theory |
in the past decades, it was recognized that quantum chaos, which is essential for the emergence of statistical mechanics and thermodynamics, manifests itself in the effective description of the eigenstates of chaotic hamiltonians through random matrix ensembles and the eigenstate thermalization hypothesis. standard mea... | adiabatic eigenstate deformations as a sensitive probe for quantum chaos |
we consider the out-of-equilibrium dynamics generated by joining two domains with arbitrary opposite magnetizations. we study the stationary state which emerges by the unitary evolution via the spin-1/2 x x z hamiltonian, in the gapless regime, where the system develops a stationary spin current. using the generalized ... | analytic solution of the domain-wall nonequilibrium stationary state |
experimental progress in atomic, molecular, and optical platforms in the last decade has stimulated strong and broad interest in the quantum coherent dynamics of many long-range interacting particles. the prominent collective character of these systems enables novel non-equilibrium phenomena with no counterpart in conv... | out-of-equilibrium dynamics of quantum many-body systems with long-range interactions |
thermalization of chaotic quantum many-body systems under unitary time evolution is related to the growth in complexity of initially simple heisenberg operators. operator growth is a manifestation of information scrambling and can be diagnosed by out-of-time-order correlators (otocs). however, the behavior of otocs of ... | locality, quantum fluctuations, and scrambling |
the preparation of long-range entangled states using unitary circuits is limited by lieb-robinson bounds, but circuits with projective measurements and feedback ("adaptive circuits") can evade such restrictions. we introduce three classes of local adaptive circuits that enable low-depth preparation of long-range entang... | measurement as a shortcut to long-range entangled quantum matter |
the syk model, a quantum mechanical model of n ≫ 1 majorana fermions χi , with a q-body, random interaction, is a novel realization of holography. it is known that the ads2 dual contains a tower of massive particles, yet there is at present no proposal for the bulk theory. as syk is solvable in the 1 /n expansion, one ... | the bulk dual of syk: cubic couplings |
one-dimensional fracton systems can exhibit perfect localization, failing to reach thermal equilibrium under arbitrary local unitary time evolution. we investigate how this nonergodic behavior manifests in the dynamics of a driven fracton system, specifically a one-dimensional floquet quantum circuit model featuring co... | dynamical scar states in driven fracton systems |
we study the out-of-equilibrium dynamics of the quantum cellular automaton known as "rule 54." for a class of low-entangled initial states, we provide an analytic description of the effect of the global evolution on finite subsystems in terms of simple quantum channels, which gives access to the full thermalization dyn... | exact thermalization dynamics in the "rule 54" quantum cellular automaton |
non-hermitian extensions of the anderson and aubry-andré-harper models are attracting considerable interest as platforms to study localization phenomena, metal-insulator, and topological phase transitions in disordered non-hermitian systems. most of the available studies, however, resort to numerical results, while few... | metal-insulator phase transition in a non-hermitian aubry-andré-harper model |
the standard hydrodynamic drude model with hard-wall boundary conditions can give accurate quantitative predictions for the optical response of noble-metal nanoparticles. however, it is less accurate for other metallic nanosystems, where surface effects due to electron density spill-out in free space cannot be neglecte... | resonance shifts and spill-out effects in self-consistent hydrodynamic nanoplasmonics |
entanglement is a central subject in quantum mechanics. due to its genuine relativistic behavior and fundamental nature, high-energy colliders are attractive systems for the experimental study of fundamental aspects of quantum mechanics. we propose the detection of entanglement between the spins of top-antitop-quark pa... | entanglement and quantum tomography with top quarks at the lhc |
two-dimensional (2d) materials are not expected to be metals at low temperature owing to electron localization. consistent with this, pioneering studies on thin films reported only superconducting and insulating ground states, with a direct transition between the two as a function of disorder or magnetic field. however... | nature of the quantum metal in a two-dimensional crystalline superconductor |
we build in this paper the counterpart of the celebrated nielsen theorem for coherence manipulation. this offers an affirmative answer to the open question: whether, given two states ρ and σ , either ρ can be transformed into σ or vice versa under incoherent operations [baumgratz et al., phys. rev. lett. 113, 140401 (2... | conditions for coherence transformations under incoherent operations |
we show that the known bound on the growth rate of the out-of-time-order four-point correlator in chaotic many-body quantum systems follows directly from the general structure of operator matrix elements in systems that obey the eigenstate thermalization hypothesis. this ties together two key paradigms of thermal behav... | bounds on chaos from the eigenstate thermalization hypothesis |
the many-body localization transition (mblt) between ergodic and many-body localized phases in disordered interacting systems is a subject of much recent interest. the statistics of eigenenergies is known to be a powerful probe of crossovers between ergodic and integrable systems in simpler examples of quantum chaos. w... | spectral statistics across the many-body localization transition |
generative modeling, which learns joint probability distribution from data and generates samples according to it, is an important task in machine learning and artificial intelligence. inspired by probabilistic interpretation of quantum physics, we propose a generative model using matrix product states, which is a tenso... | unsupervised generative modeling using matrix product states |
we review the recent progress in the understanding of the relaxation of isolated near-integrable quantum many-body systems. focusing on prethermalization and universal dynamics following a quench, we describe the experiments with ultracold atomic gases that illustrate these phenomena and summarize the essential theoret... | prethermalization and universal dynamics in near-integrable quantum systems |
we show how generic non-hermitian tight-binding lattice models can be realized in an unconditional, quantum-mechanically consistent manner by constructing an appropriate open quantum system. we focus on the quantum steady states of such models for both fermionic and bosonic systems. surprisingly, key features and spati... | nonequilibrium stationary states of quantum non-hermitian lattice models |
hyperbolic lattices are a revolutionary platform for tabletop simulations of holography and quantum physics in curved space and facilitate efficient quantum error correcting codes. their underlying geometry is non-euclidean, and the absence of bloch's theorem precludes the straightforward application of the often indis... | crystallography of hyperbolic lattices |
we study the dynamics of thermalization following a quantum quench using tensor-network methods. contrary to the common belief that the rapid growth of entanglement and the resulting exponential growth of the bond dimension restricts simulations to short times, we demonstrate that the long time limit of local observabl... | quantum thermalization dynamics with matrix-product states |
we study mechanical cooling in systems of coupled passive (lossy) and active (with gain) optical resonators. we find that for a driving laser which is red-detuned with respect to the cavity frequency, the supermode structure of the system is radically changed, featuring the emergence of genuine high-order exceptional p... | high-order exceptional points in optomechanics |
we explore the rich landscape of higher-form and non-invertible symmetries that emerge at low energies in generic ordered phases. using that their charge is carried by homotopy defects (i.e., domain walls, vortices, hedgehogs, etc.), in the absence of domain walls we find that their symmetry defects in ${d}$-dimensiona... | emergent generalized symmetries in ordered phases |
decoherence inevitably happens when a quantum state is exposed to its environment, which can affect quantum critical points (qcps) in a nontrivial way. as was pointed out in the recent literature on (1 +1 )d conformal field theory (cft) [garratt et al. measurements conspire nonlocally to restructure critical quantum st... | quantum criticality under decoherence or weak measurement |
recent years have witnessed an explosion of interest in quantum devices for the production, storage, and transfer of energy. in this colloquium, we concentrate on the field of quantum energy storage by reviewing recent theoretical and experimental progress in quantum batteries. we first provide a theoretical background... | colloquium: quantum batteries |
the time evolution of the entanglement entropy is a key concept to understand the structure of a nonequilibrium quantum state. in a large class of models, such evolution can be understood in terms of a semiclassical picture of moving quasiparticles spreading the entanglement throughout the system. however, it is not ye... | quasiparticle dynamics of symmetry-resolved entanglement after a quench: examples of conformal field theories and free fermions |
recent years have seen remarkable development in open quantum systems effectively described by non-hermitian hamiltonians. a unique feature of non-hermitian topological systems is the skin effect, anomalous localization of an extensive number of eigenstates driven by nonreciprocal dissipation. despite its significance ... | entanglement phase transition induced by the non-hermitian skin effect |
the quantum approximate optimization algorithm (qaoa) has rapidly become a cornerstone of contemporary quantum algorithm development. despite a growing range of applications, only a few results have been developed towards understanding the algorithm's ultimate limitations. here we report that qaoa exhibits a strong dep... | reachability deficits in quantum approximate optimization |
the concept of quantum many-body scars has recently been put forward as a route to describe weak ergodicity breaking and violation of the eigenstate thermalization hypothesis. we propose a simple setup to generate quantum many-body scars in a doubly modulated bose-hubbard system which can be readily implemented in cold... | quantum many-body scars in optical lattices |
realizing topological insulators is of great current interest because of their remarkable properties and possible future applications. there are recent proposals based on floquet analyses that one can generate topologically non-trivial insulators by periodically driving topologically trivial ones. here we address what ... | dynamical preparation of floquet chern insulators |
the entanglement in operator space is a well established measure for the complexity of the quantum many-body dynamics. in particular, that of local operators has recently been proposed as dynamical chaos indicator, i.e. as a quantity able to discriminate between quantum systems with integrable and chaotic dynamics. for... | operator entanglement in local quantum circuits i: chaotic dual-unitary circuits |
we investigate a class of local quantum circuits on chains of d-level systems (qudits) that share the so-called `dual unitarity' property. in essence, the latter property implies that these systems generate unitary dynamics not only when propagating in time, but also when propagating in space. we consider space-time ho... | random matrix spectral form factor of dual-unitary quantum circuits |
we study the double-scaling limit of syk (ds-syk) model and elucidate the underlying quantum group symmetry. the ds-syk model is characterized by a parameter q, and in the q → 1 and low-energy limit it goes over to the familiar schwarzian theory. we relate the chord and transfer-matrix picture to the motion of a "bound... | quantum groups, non-commutative ads2, and chords in the double-scaled syk model |
experiments on disordered alloys1-3 suggest that spin glasses can be brought into low-energy states faster by annealing quantum fluctuations than by conventional thermal annealing. owing to the importance of spin glasses as a paradigmatic computational testbed, reproducing this phenomenon in a programmable system has r... | quantum critical dynamics in a 5,000-qubit programmable spin glass |
topological operations around exceptional points1-8—time-varying system configurations associated with non-hermitian singularities—have been proposed as a robust approach to achieving far-reaching open-system dynamics, as demonstrated in highly dissipative microwave transmission3 and cryogenic optomechanical oscillator... | time-asymmetric loop around an exceptional point over the full optical communications band |
we use the density matrix renormalization group method to calculate several energy eigenvalues of the frustrated s =1 /2 square-lattice j1-j2 heisenberg model on 2 l ×l cylinders with l ≤10 . we identify excited-level crossings versus the coupling ratio g =j2/j1 and study their drifts with the system size l . the lowes... | critical level crossings and gapless spin liquid in the square-lattice spin-1 /2 j1-j2 heisenberg antiferromagnet |
as the field of artificial intelligence advances, the demand for algorithms that can learn quickly and efficiently increases. an important paradigm within artificial intelligence is reinforcement learning1, where decision-making entities called agents interact with environments and learn by updating their behaviour on ... | experimental quantum speed-up in reinforcement learning agents |
machine learning (ml) methods are being used in almost every conceivable area of electronic structure theory and molecular simulation. in particular, ml has become firmly established in the construction of high-dimensional interatomic potentials. not a day goes by without another proof of principle being published on h... | perspective on integrating machine learning into computational chemistry and materials science |
we examine localization phenomena associated with generic, high entropy, states of a translation-invariant, one-dimensional spin ladder. at early times, we find slow growth of entanglement entropy consistent with the known phenomenology of many-body localization in disordered, interacting systems. at intermediate times... | quasi-many-body localization in translation-invariant systems |
entanglement plays a prominent role in the study of condensed matter many-body systems: entanglement measures not only quantify the possible use of these systems in quantum information protocols, but also shed light on their physics. however, exact analytical results remain scarce, especially for systems out of equilib... | entanglement measures in a nonequilibrium steady state: exact results in one dimension |
entanglement transitions in quantum dynamics present a novel class of phase transitions in nonequilibrium systems. when a many-body quantum system undergoes unitary evolution interspersed with monitored random measurements, the steady state can exhibit a phase transition between volume- and area-law entanglement. there... | measurement-induced criticality and entanglement clusters: a study of one-dimensional and two-dimensional clifford circuits |
we identify a class of one-dimensional spin and fermionic lattice models that display diverging spin and charge diffusion constants, including several paradigmatic models of exactly solvable, strongly correlated many-body dynamics such as the isotropic heisenberg spin chains, the fermi-hubbard model, and the t -j model... | superdiffusion in one-dimensional quantum lattice models |
we demonstrate analytically and numerically that the paradigmatic model of quantum magnetism, the heisenberg xxz spin chain, does not equilibrate. it constitutes an example of persistent nonstationarity in a quantum many-body system that does not rely on external driving or coupling to an environment. we trace this phe... | isolated heisenberg magnet as a quantum time crystal |
mechanical systems facilitate the development of a hybrid quantum technology comprising electrical, optical, atomic and acoustic degrees of freedom1, and entanglement is essential to realize quantum-enabled devices. continuous-variable entangled fields—known as einstein-podolsky-rosen (epr) states—are spatially separat... | stationary entangled radiation from micromechanical motion |
we study the effects of integrability-breaking perturbations on the nonequilibrium evolution of many-particle quantum systems. we focus on a class of spinless fermion models with weak interactions. we employ equation of motion techniques that can be viewed as generalizations of quantum boltzmann equations. we benchmark... | prethermalization and thermalization in models with weak integrability breaking |
classical hydrodynamics is a remarkably versatile description of the coarse-grained behaviour of many-particle systems once local equilibrium has been established1. the form of the hydrodynamical equations is determined primarily by the conserved quantities present in a system. some quantum spin chains are known to pos... | detection of kardar-parisi-zhang hydrodynamics in a quantum heisenberg spin-1/2 chain |
attosecond metrology of atoms has accessed the time scale of the most fundamental processes in quantum mechanics. transferring the time-resolved photoelectric effect from atoms to molecules considerably increases experimental and theoretical challenges. here we show that orientation- and energy-resolved measurements ch... | orientation-dependent stereo wigner time delay and electron localization in a small molecule |
spontaneous parametric down-conversion (spdc), also known as parametric fluorescence, parametric noise, parametric scattering and all various combinations of the abbreviation spdc, is a non-linear optical process where a photon spontaneously splits into two other photons of lower energies. one would think that this art... | spontaneous parametric down-conversion |
motivated by the qualitative picture of canonical typicality, we propose a refined formulation of the eigenstate thermalization hypothesis (eth) for chaotic quantum systems. this formulation, which we refer to as subsystem eth, is in terms of the reduced density matrix of subsystems. this strong form of eth outlines th... | subsystem eigenstate thermalization hypothesis |
the quantum speed limit (qsl), or the energy-time uncertainty relation, describes the fundamental maximum rate for quantum time evolution and has been regarded as being unique in quantum mechanics. in this study, we obtain a classical speed limit corresponding to the qsl using hilbert space for the classical liouville ... | quantum speed limit is not quantum |
an open question of fundamental importance in thermodynamics is how to describe the fluctuations of work for quantum coherent processes. in the standard approach, based on a projective energy measurement both at the beginning and at the end of the process, the first measurement destroys any initial coherence in the ene... | no-go theorem for the characterization of work fluctuations in coherent quantum systems |
heat spontaneously flows from hot to cold in standard thermodynamics. however, the latter theory presupposes the absence of initial correlations between interacting systems. we here experimentally demonstrate the reversal of heat flow for two quantum correlated spins-1/2, initially prepared in local thermal states at d... | reversing the direction of heat flow using quantum correlations |
this monograph attempts a theory of every 'thing' that can be distinguished from other things in a statistical sense. the ensuing statistical independencies, mediated by markov blankets, speak to a recursive composition of ensembles (of things) at increasingly higher spatiotemporal scales. this decomposition provides a... | a free energy principle for a particular physics |
continuous phase transitions in equilibrium statistical mechanics were successfully described 50 years ago with the development of the renormalization group framework. this framework was initially developed in the context of phase transitions whose universal properties are captured by the long wavelength (and long time... | deconfined quantum critical points: a review |
we propose a scaling theory for the many-body localization (mbl) phase transition in one dimension, building on the idea that it proceeds via a "quantum avalanche." we argue that the critical properties can be captured at a coarse-grained level by a kosterlitz-thouless (kt) renormalization group (rg) flow. on phenomeno... | kosterlitz-thouless scaling at many-body localization phase transitions |
discrete quantum trajectories of systems under random unitary gates and projective measurements have been shown to feature transitions in the entanglement scaling that are not encoded in the density matrix. in this paper, we study the projective transverse field ising model, a stochastic model with two noncommuting pro... | entanglement transition in the projective transverse field ising model |
understanding universal aspects of quantum dynamics is an unresolved problem in statistical mechanics. in particular, the spin dynamics of the 1d heisenberg model were conjectured to belong to the kardar-parisi-zhang (kpz) universality class based on the scaling of the infinite-temperature spin-spin correlation functio... | dynamics of magnetization at infinite temperature in a heisenberg spin chain |
continuously measured quantum systems are characterized by an output current, in the form of a stochastic and correlated time series which conveys crucial information about the underlying quantum system. the many tools used to describe current fluctuations are scattered across different communities: quantum opticians o... | current fluctuations in open quantum systems: bridging the gap between quantum continuous measurements and full counting statistics |
ensembles of particles governed by quantum mechanical laws exhibit fascinating emergent behavior. atomic quantum gases, liquid helium, and electrons in quantum materials all show distinct properties due to their composition and interactions. quantum degenerate samples of bosonic dipolar molecules promise the realizatio... | observation of bose-einstein condensation of dipolar molecules |
we investigate and characterize the dynamics of operator growth in irrational two-dimensional conformal field theories. by employing the oscillator realization of the virasoro algebra and cft states, we systematically implement the lanczos algorithm and evaluate the krylov complexity of simple operators (primaries and ... | operator growth in 2d cft |
the control of physical systems and their dynamics on the level of individual quanta underpins both fundamental science and quantum technologies. trapped atomic and molecular systems, neutral1 and charged2, are at the forefront of quantum science. their extraordinary level of control is evidenced by numerous applicatio... | observation of feshbach resonances between a single ion and ultracold atoms |
topologically quantized response is one of the focal points of contemporary condensed matter physics. while it directly results in quantized response coefficients in quantum systems, there has been no notion of quantized response in classical systems thus far. this is because quantized response has always been connecte... | quantized classical response from spectral winding topology |
this is the first in a series of papers presenting a new understanding of scattering amplitudes based on fundamentally combinatorial ideas in the kinematic space of the scattering data. we study the simplest theory of colored scalar particles with cubic interactions, at all loop orders and to all orders in the topologi... | all loop scattering as a counting problem |
by coupling a macroscopic mechanical oscillator to two microwave cavities, we simultaneously prepare and monitor a nonclassical steady state of mechanical motion. in each cavity, correlated radiation pressure forces induced by two coherent drives engineer the coupling between the quadratures of light and motion. we, fi... | quantum nondemolition measurement of a nonclassical state of a massive object |
we analyze dynamical large deviations of quantum trajectories in markovian open quantum systems in their full generality. we derive a quantum level-2.5 large deviation principle for these systems, which describes the joint fluctuations of time-averaged quantum jump rates and of the time-averaged quantum state for long ... | unraveling the large deviation statistics of markovian open quantum systems |
the second-order nonlinear responses of inviscid chiral fluids near local equilibrium are investigated by applying the chiral kinetic theory (ckt) incorporating side-jump effects. it is shown that the local equilibrium distribution function can be nontrivially introduced in a comoving frame with respect to the fluid ve... | nonlinear responses of chiral fluids from kinetic theory |
if a photon interacts with a member of an entangled photon pair via a bell-state measurement (bsm), its state is teleported over principally arbitrary distances onto the pair's second member. since 1997, this puzzling prediction of quantum mechanics has been demonstrated many times. however, with two exceptions, only t... | quantum teleportation across a metropolitan fibre network |
silicon carbide has recently surged as an alternative material for scalable and integrated quantum photonics, as it is a host for naturally occurring color centers within its bandgap, emitting from the uv to the ir even at telecom wavelength. some of these color centers have been proved to be characterized by quantum p... | silicon carbide color centers for quantum applications |
there is a common belief in the condensed matter community that bulk quantities become insensitive to the boundary condition in the infinite-volume limit. here we reconsider this statement in terms of recent arguments of non-hermitian skin effects—strong dependence of spectra on boundary conditions for the non-hermitia... | non-hermitian skin effects in hermitian correlated or disordered systems: quantities sensitive or insensitive to boundary effects and pseudo-quantum-number |
magnetic insulators in the regime of strong spin-orbit coupling exhibit intriguing behaviors in external magnetic fields, reflecting the frustrated nature of their effective interactions. we review the recent advances in understanding the field responses of materials that are described by models with strongly bond-depe... | heisenberg-kitaev physics in magnetic fields |
the ability to generate complex optical photon states involving entanglement between multiple optical modes is not only critical to advancing our understanding of quantum mechanics but will play a key role in generating many applications in quantum technologies. these include quantum communications, computation, imagin... | integrated sources of photon quantum states based on nonlinear optics |
we review the recent advances on exact results for dynamical correlation functions at large scales and related transport coefficients in interacting integrable models. we discuss drude weights, conductivity and diffusion constants, as well as linear and nonlinear response on top of equilibrium and non-equilibrium state... | correlation functions and transport coefficients in generalised hydrodynamics |
the theory of entanglement provides a fundamentally new language for describing interactions and correlations in many body systems. its vocabulary consists of qubits and entangled pairs, and the syntax is provided by tensor networks. we review how matrix product states and projected entangled pair states describe many-... | matrix product states and projected entangled pair states: concepts, symmetries, and theorems |
a key goal of quantum chaos is to establish a relationship between widely observed universal spectral fluctuations of clean quantum systems and random matrix theory (rmt). most prominent features of such rmt behavior with respect to a random spectrum, both encompassed in the spectral pair correlation function, are stat... | many-body quantum chaos: analytic connection to random matrix theory |
it is commonly believed that quantum isolated systems satisfying the eigenstate thermalization hypothesis (eth) are diffusive. we show that this assumption is too restrictive since there are systems that are asymptotically in a thermal state yet exhibit anomalous, subdiffusive thermalization. we show that such systems ... | anomalous thermalization in ergodic systems |
the complexity of quantum many-body systems originates from the interplay of strong interactions, quantum statistics, and the large number of quantum-mechanical degrees of freedom. probing these systems on a microscopic level with single-site resolution offers important insights. here we report site-resolved imaging of... | site-resolved imaging of a fermionic mott insulator |
the motion of a mechanical object, even a human-sized object, should be governed by the rules of quantum mechanics. coaxing them into a quantum state is, however, difficult because the thermal environment masks any quantum signature of the object’s motion. the thermal environment also masks the effects of proposed modi... | approaching the motional ground state of a 10-kg object |
thermodynamics is a highly successful macroscopic theory widely used across the natural sciences and for the construction of everyday devices, from car engines to solar cells. with thermodynamics predating quantum theory, research now aims to uncover the thermodynamic laws that govern finite size systems which may in a... | coherence and measurement in quantum thermodynamics |
entanglement is an essential property of multipartite quantum systems, characterized by the inseparability of quantum states of objects regardless of their spatial separation. generation of entanglement between increasingly macroscopic and disparate systems is an ongoing effort in quantum science, as it enables hybrid ... | entanglement between distant macroscopic mechanical and spin systems |
we introduce a new quantity, called pseudo-entropy, as a generalization of entanglement entropy via postselection. we expect this quantity to provide a new class of order parameters in quantum many-body systems. in the anti-de sitter space (ads)/conformal field theory (cft) correspondence, this quantity is dual to area... | new holographic generalization of entanglement entropy |
understanding the spreading of quantum correlations in out-of-equilibrium many-body systems is one of the major challenges in physics. for isolated systems, a hydrodynamic theory explains the origin and spreading of entanglement via the propagation of quasiparticle pairs. however, when systems interact with their surro... | spreading of correlations in markovian open quantum systems |
the energy levels of hydrogen-like atomic systems can be calculated with great precision. starting from their quantum mechanical solution, they have been refined over the years to include the electron spin, the relativistic and quantum field effects, and tiny energy shifts related to the complex structure of the nucleu... | measuring the α-particle charge radius with muonic helium-4 ions |
we consider a clean quantum system subject to strong periodic driving. the existence of a dominant energy scale, hdx, can generate considerable structure in an effective description of a system that, in the absence of the drive, is nonintegrable and interacting, and does not host localization. in particular, we uncover... | dynamical freezing and scar points in strongly driven floquet matter: resonance vs emergent conservation laws |
disorder-free localization has been recently introduced as a mechanism for ergodicity breaking in low-dimensional homogeneous lattice gauge theories caused by local constraints imposed by gauge invariance. we show that also genuinely interacting systems in two spatial dimensions can become nonergodic as a consequence o... | disorder-free localization in an interacting 2d lattice gauge theory |
demonstrating quantum advantage requires experimental implementation of a computational task that is hard to achieve using state-of-the-art classical systems. one approach is to perform sampling from a probability distribution associated with a class of highly entangled many-body wavefunctions. it has been suggested th... | limitations of linear cross-entropy as a measure for quantum advantage |
controlling and measuring the temperature in different devices and platforms that operate in the quantum regime is, without any doubt, essential for any potential application. in this review, we report the most recent theoretical developments dealing with accurate estimation of very low temperatures in quantum systems.... | thermometry in the quantum regime: recent theoretical progress |
we review the non-equilibrium dynamics of many-body quantum systems after a quantum quench with spatial inhomogeneities, either in the hamiltonian or in the initial state. we focus on integrable and many-body localized systems that fail to self-thermalize in isolation and for which the standard hydrodynamical picture b... | nonequilibrium quantum dynamics and transport: from integrability to many-body localization |
closed generic quantum many-body systems may fail to thermalize under certain conditions even after long times, a phenomenon called many-body localization (mbl). numerous studies support the stability of the mbl phase in strongly disordered one-dimensional systems. however, the situation is much less clear when a small... | many-body delocalization in the presence of a quantum bath |
the idea that events are equipped with a partial causal order is central to our understanding of physics in the tested regimes: given two pointlike events a and b, either a is in the causal past of b, b is in the causal past of a, or a and b are space-like separated. operationally, the meaning of these order relations ... | causal and causally separable processes |
non-hermitian random matrices have been utilized in such diverse fields as dissipative and stochastic processes, mesoscopic physics, nuclear physics, and neural networks. however, the only known universality class of level-spacing statistics is that of the ginibre ensemble characterized by complex-conjugation symmetry.... | universality classes of non-hermitian random matrices |
we develop a general framework to describe the thermodynamics of microscopic heat engines driven by arbitrary periodic temperature variations and modulations of a mechanical control parameter. within the slow-driving regime, our approach leads to a universal trade-off relation between efficiency and power, which follow... | thermodynamic geometry of microscopic heat engines |
the most accepted version of the third law of thermodynamics, the unattainability principle, states that any process cannot reach absolute zero temperature in a finite number of steps and within a finite time. here, we provide a derivation of the principle that applies to arbitrary cooling processes, even those exploit... | a general derivation and quantification of the third law of thermodynamics |
imposing chirality on a physical system engenders unconventional energy flow and responses, such as the aharonov-bohm effect1 and the topological quantum hall phase for electrons in a symmetry-breaking magnetic field. recently, great interest has arisen in combining that principle with broken hermiticity to explore nov... | non-hermitian chiral phononics through optomechanically induced squeezing |
we consider the nonequilibrium protocol where two semi-infinite gapped xxz chains, initially prepared in different equilibrium states, are suddenly joined together. at large times, a generalized hydrodynamic description applies, according to which the system can locally be represented by space- and time-dependent stati... | transport in out-of-equilibrium xxz chains: nonballistic behavior and correlation functions |
we analyze the entropy production and the maximal extractable work from a squeezed thermal reservoir. the nonequilibrium quantum nature of the reservoir induces an entropy transfer with a coherent contribution while modifying its thermal part, allowing work extraction from a single reservoir, as well as great improveme... | entropy production and thermodynamic power of the squeezed thermal reservoir |
the near-threshold photo or electroproduction of heavy vector quarkonium off the proton is studied in quantum chromodynamics. similar to the high-energy limit, the production amplitude can be factorized in terms of gluonic generalized parton distributions and the quarkonium distribution amplitude. at the threshold, the... | qcd analysis of near-threshold photon-proton production of heavy quarkonium |
quantum mechanics exhibits a wide range of nonclassical features, of which entanglement in multipartite systems takes a central place. in several specific settings, it is well known that nonclassicality (e.g., squeezing, spin squeezing, coherence) can be converted into entanglement. in this work, we present a general f... | converting nonclassicality into entanglement |
the entanglement in a quantum system that possesses an internal symmetry, characterized by the sz magnetization or u (1 ) charge, is distributed among different sectors. the aim of this rapid communication is to gain a deeper understanding of the contribution to the entanglement entropy in each of those sectors for the... | equipartition of the entanglement entropy |
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