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we present a new method of deriving shapes of entanglement wedges directly from conformal field theory (cft) calculations. we point out that a reduced density matrix in holographic cfts possesses a sharp wedge structure such that inside the wedge we can distinguish two local excitations, while outside we cannot. we can... | looking at shadows of entanglement wedges |
the classical treatment of plasmonics is insufficient at the nanometer-scale due to quantum mechanical surface phenomena. here, an extension of the classical paradigm is reported which rigorously remedies this deficiency through the incorporation of first-principles surface response functions—the feibelman d parameters... | quantum corrections in nanoplasmonics: shape, scale, and material |
quantum mechanics is inherently probabilistic in light of born's rule. using quantum circuits as probabilistic generative models for classical data exploits their superior expressibility and efficient direct sampling ability. however, training of quantum circuits can be more challenging compared to classical neural net... | learning and inference on generative adversarial quantum circuits |
thanks to the recent discovery of the magic-angle bilayer graphene, twistronics is quickly becoming a burgeoning field in condensed matter physics. this rapid communication expands the realm of twistronics to acoustics by introducing twisted bilayer phononic graphene, which remarkably also harbors the magic angle, evid... | magic-angle bilayer phononic graphene |
we show that it is possible to have nonzero ergotropy in the steady states of an open quantum system consisting of qubits that are collectively coupled to a thermal bath at a finite temperature. the dynamics of our model leads the qubits into a steady state that has coherences in the energy eigenbasis when the system c... | ergotropy from coherences in an open quantum system |
bound states in the continuum provide a remarkable example of how a simple problem solved about a century ago in quantum mechanics can drive the research on a whole spectrum of resonant phenomena in wave physics. due to their huge radiative lifetime, bound states in the continuum have found multiple applications in var... | bound states in the continuum in photonic structures |
using arguments built on ergodicity, we derive an analytical expression for the renyi entanglement entropies which, we conjecture, applies to the finite-energy density eigenstates of chaotic many-body hamiltonians. the expression is a universal function of the density of states and is valid even when the subsystem is a... | renyi entropy of chaotic eigenstates |
achieving co2 reduction with h2o on metal photocatalysts and understanding the corresponding mechanisms at the molecular level are challenging. herein, we report that quantum-sized au nanoparticles can photocatalytically reduce co2 to co with the help of h2o by electron-hole pairs mainly originating from interband tran... | molecular-level insight into photocatalytic co2 reduction with h2o over au nanoparticles by interband transitions |
this text distills the core ideas of statistical mechanics to make room for new advances important to information theory, complexity, active matter, and dynamical systems. chapters address random walks, equilibrium systems, entropy, free energies, quantum systems, calculation and computation, order parameters and topol... | statistical mechanics: entropy, order parameters, and complexity (2nd edn) |
the tunneling between the two ground states of an ising ferromagnet is a typical example of many-body tunneling processes between two local minima, as they occur during quantum annealing. performing quantum monte carlo (qmc) simulations we find that the qmc tunneling rate displays the same scaling with system size, as ... | understanding quantum tunneling through quantum monte carlo simulations |
quantum mechanics provides the means of generating genuine randomness that is impossible with deterministic classical processes. remarkably, the unpredictability of randomness can be certified in a manner that is independent of implementation devices. here, we present an experimental study of device-independent quantum... | high-speed device-independent quantum random number generation without a detection loophole |
the quantum multiparameter estimation is very different from the classical multiparameter estimation due to heisenberg's uncertainty principle in quantum mechanics. when the optimal measurements for different parameters are incompatible, they cannot be jointly performed. we find a correspondence relationship between th... | incorporating heisenberg's uncertainty principle into quantum multiparameter estimation |
understanding the dynamics of strongly interacting disordered quantum systems is one of the most challenging problems in modern science, due to features such as the breakdown of thermalization and the emergence of glassy phases of matter. we report on the observation of anomalous relaxation dynamics in an isolated xxz ... | glassy dynamics in a disordered heisenberg quantum spin system |
although entanglement is a key resource for quantum-enhanced metrology, not all entanglement is useful. for example, in the process of many-body thermalization, bipartite entanglement grows rapidly, naturally saturating to a volume law. this type of entanglement generation is ubiquitous in nature but has no known appli... | entanglement enhanced metrology with quantum many-body scars |
we investigate the logarithmic negativity in strongly disordered spin chains in the random-singlet phase. we focus on the spin-1/2 random heisenberg chain and the random x x chain. we find that for two arbitrary intervals, the disorder-averaged negativity and the mutual information are proportional to the number of sin... | entanglement negativity in random spin chains |
transforming an initial quantum state into a target state through the fastest possible route—a quantum brachistochrone—is a fundamental challenge for many technologies based on quantum mechanics. in two-level systems, the quantum brachistochrone solutions are long known. these solutions, however, are not applicable to ... | demonstration of quantum brachistochrones between distant states of an atom |
we describe the implementation of laser-cooled silica microspheres as force sensors in a dual-beam optical dipole trap in high vacuum. using this system we have demonstrated trap lifetimes exceeding several days, attonewton force detection capability, and wide tunability in trapping and cooling parameters. measurements... | attonewton force detection using microspheres in a dual-beam optical trap in high vacuum |
we introduce a novel tensor network structure augmenting the well-established tree tensor network representation of a quantum many-body wave function. the new structure satisfies the area law in high dimensions remaining efficiently manipulatable and scalable. we benchmark this novel approach against paradigmatic two-d... | efficient tensor network ansatz for high-dimensional quantum many-body problems |
quantum manipulation of coupled mechanical resonators has become an important research topic in optomechanics because these systems can be used to study the quantum coherence effects involving multiple mechanical modes. a prerequisite for observing macroscopic mechanical coherence is to cool the mechanical resonators t... | simultaneous cooling of coupled mechanical resonators in cavity optomechanics |
the dicke model is of fundamental importance in quantum mechanics for understanding the collective behavior of atoms coupled to a single electromagnetic mode. here, we demonstrate a dicke-model simulation via cavity-assisted raman transitions in a configuration using counterpropagating laser beams. the observations ind... | dicke-model simulation via cavity-assisted raman transitions |
we construct no-ghost theories of analytic mechanics involving arbitrary higher-order derivatives in lagrangian. it has been known that for theories involving at most second-order time derivatives in the lagrangian, eliminating linear dependence of canonical momenta in the hamiltonian is necessary and sufficient condit... | ghost-free theories with arbitrary higher-order time derivatives |
transmon qubits are the predominant element in circuit-based quantum information processing, such as existing quantum computers, due to their controllability and ease of engineering implementation. but more than qubits, transmons are multilevel nonlinear oscillators that can be used to investigate fundamental physics q... | spectral kissing and its dynamical consequences in the squeeze-driven kerr oscillator |
simultaneously cooling the rotational and translational motion of nanoscale dielectrics into the quantum regime is an open task of great importance for sensing applications and quantum superposition tests. here, we show that the six-dimensional ground state can be reached by coherent-scattering cooling with an elliptic... | cooling nanorotors by elliptic coherent scattering |
floquet topological insulators are noninteracting quantum systems that, when driven by a time-periodic field, are described by effective hamiltonians whose bands carry nontrivial topological invariants. a longstanding question concerns the possibility of selectively populating one of these effective bands, thereby maxi... | occupation of topological floquet bands in open systems |
the performance of quantum heat engines is generally based on the analysis of a single cycle. we challenge this approach by showing that the total work performed by a quantum engine need not be proportional to the number of cycles. furthermore, optimizing the engine over multiple cycles leads to the identification of s... | quantum performance of thermal machines over many cycles |
confinement effects of aharonov-bohm (ab) flux and magnetic fields with topological defect on co diatomic molecule modeled by screened modified kratzer potential is investigated in this paper. the all-encompassing effects of the fields and topological defect result in a strongly repulsive system. we discover that the c... | effects of topological defect on the energy spectra and thermo-magnetic properties of co diatomic molecule |
we demonstrate that some quantum teleportation protocols exhibit measurement induced phase transitions in sachdev-ye-kitaev model. namely, kitaev-yoshida and gao-jafferis-wall protocols have a phase transition if we apply them at a large projection rate or at a large coupling rate respectively. it is well-known that at... | measurement-induced phase transition in teleportation and wormholes |
we demonstrate the formation of large sheets of layered organic-inorganic perovskite (oipc) crystals, as thin as a single unit cell, prepared by mechanical exfoliation. the resulting two-dimensional oipc nanosheets of 2.4 nm thickness are direct semiconductors with an optical band gap of 2.4 ev. they exhibit unusually ... | excitons in ultrathin organic-inorganic perovskite crystals |
light is often characterized only by its classical properties, like intensity or coherence. when looking at its quantum properties, described by photon correlations, new information about the state of the matter generating the radiation can be revealed. in particular the difference between independent and entangled emi... | giant photon bunching, superradiant pulse emission and excitation trapping in quantum-dot nanolasers |
we investigate the near-field interaction between an isolated free-base phthalocyanine molecule and a plasmon localized in the gap between an nacl-covered ag(111) surface and the tip apex of a scanning tunneling microscope. when the tip is located in the close proximity of the molecule, asymmetric dips emerge in the br... | single-molecule investigation of energy dynamics in a coupled plasmon-exciton system |
although most quantum systems thermalize locally on short timescales independent of initial conditions, recent developments have shown this is not always the case. lattice geometry and quantum mechanics can conspire to produce constrained quantum dynamics and associated glassy behavior, a phenomenon that falls outside ... | frustration-induced emergent hilbert space fragmentation |
we analyze the interference field formed by two electromagnetic plane waves (with the same frequency but different wave vectors), and find that such a field reveals a rich and highly nontrivial structure of the local momentum and spin densities. despite the seemingly planar and extensively studied character of the two-... | transverse spin and momentum in two-wave interference |
some of the oldest and most important applications of thermodynamics are operations of refrigeration as well as production of useful energy. part of the efforts to understand and develop thermodynamics in the quantum regime have been focusing on harnessing quantum effects to such operations. in this review, we present ... | roles of quantum coherences in thermal machines |
highly excited states of quantum many-body systems are central objects in the study of quantum dynamics and thermalization that challenge classical computational methods due to their volume-law entanglement content. in this work, we explore the potential of variational quantum algorithms to approximate such states. we ... | adaptive variational quantum eigensolvers for highly excited states |
we review recent results on an exactly solvable model of nonequilibrium statistical mechanics, specifically the classical rule 54 reversible cellular automaton and some of its quantum extensions. we discuss the exact microscopic description of nonequilibrium dynamics as well as the equilibrium and nonequilibrium statio... | rule 54: exactly solvable model of nonequilibrium statistical mechanics |
time remains one of the least well-understood concepts in physics, most notably in quantum mechanics. a central goal is to find the fundamental limits of measuring time. one of the main obstacles is the fact that time is not an observable and thus has to be measured indirectly. here, we explore these questions by intro... | autonomous quantum clocks: does thermodynamics limit our ability to measure time? |
we review the schwinger-keldysh, or in-in, formalism for studying quantum dynamics of systems out-of-equilibrium. the main motivation is to rephrase well known facts in the subject in a mathematically elegant setting, by exhibiting a set of brst symmetries inherent in the construction. we show how these fundamental sym... | schwinger-keldysh formalism. part i: brst symmetries and superspace |
we explore the perspective of considering the squeezed thermal reservoir as an equilibrium reservoir in a generalized gibbs ensemble with two noncommuting conserved quantities. we outline the main properties of such a reservoir in terms of the exchange of energy, both heat and work, and entropy, giving some key example... | squeezed thermal reservoir as a generalized equilibrium reservoir |
point defects in semiconductor crystals provide a means for carriers to recombine nonradiatively. this recombination process impacts the performance of devices. we present the nonrad code that implements the first-principles approach of alkauskas et al. (2014) [8] for the evaluation of nonradiative capture coefficients... | nonrad: computing nonradiative capture coefficients from first principles |
we report 51v nmr and inelastic neutron scattering (ins) measurements on a quasi-1d antiferromagnet baco2v2o8 under transverse field along the [010] direction. the scaling behavior of the spin-lattice relaxation rate above the néel temperatures unveils a 1d quantum critical point (qcp) at hc1 d≈4.7 t , which is masked ... | e8 spectra of quasi-one-dimensional antiferromagnet baco2v2o8 under transverse field |
according to clausius formulation of the second law of thermodynamics, for any thermal machine withdrawing heats q1 ,2 from two heat reservoirs at temperatures t1 ,2, it holds that q1/t1+q2/t2≤0 . combined with the observation that the quantity q1+q2 is the work w done by the system, that inequality tells us that only ... | nonadiabatic single-qubit quantum otto engine |
we discuss nonergodic dynamics of interacting spinless fermions in a tilted optical lattice as modeled by a xxz spin chain in a magnetic (or electric) field changing linearly across the chain. the time dynamics is studied using exact propagation for small chains and matrix product state techniques for larger system siz... | many-body localization in tilted and harmonic potentials |
the equivalence between particles under rotation and charged particles in a magnetic field relates phenomena as diverse as spinning atomic nuclei, weather patterns, and the quantum hall effect. for such systems, quantum mechanics dictates that translations along different directions do not commute, implying a heisenber... | geometric squeezing into the lowest landau level |
interacting quantum systems illustrate complex phenomena including phase transitions to novel ordered phases. the universal nature of critical phenomena reduces their description to determining only the transition temperature and the critical exponents. numerically calculating these results for systems in new universal... | many-body thermodynamics on quantum computers via partition function zeros |
we discuss the possibility of devising cosmological observables which violate bell's inequalities. such observables could be used to argue that cosmic scale features were produced by quantum mechanical effects in the very early universe. as a proof of principle, we propose a somewhat elaborate inflationary model where ... | a model with cosmological bell inequalities |
quantum many-body systems may defy thermalization even without disorder. intriguingly, non-ergodicity may be caused by a fragmentation of the many-body hilbert-space into dynamically disconnected subspaces. the tilted one-dimensional fermi-hubbard model was proposed as a platform to realize fragmented models perturbati... | experimental realization of fragmented models in tilted fermi-hubbard chains |
quantum spin hall (qsh) insulators are materials that feature an insulating bulk and host edge states protected by time-reversal symmetry. the helical locking of spin and momentum in these states suppresses backscattering of charge carriers, promising applications from low-power electronics to quantum computing. a majo... | signature of large-gap quantum spin hall state in the layered mineral jacutingaite |
in recent years we have witnessed a concentrated effort to make sense of thermodynamics for small-scale systems. one of the main difficulties is to capture a suitable notion of work that models realistically the purpose of quantum machines, in an analogous way to the role played, for macroscopic machines, by the energy... | thermodynamic work from operational principles |
we report a systematic study of finite-temperature spin transport in quantum and classical one-dimensional magnets with isotropic spin interactions, including both integrable and nonintegrable models. employing a phenomenological framework based on a generalized burgers' equation in a time-dependent stochastic environm... | universality classes of spin transport in one-dimensional isotropic magnets: the onset of logarithmic anomalies |
recent progress in nanoscale manufacturing has allowed to experimentally investigate quantum dots coupled to two superconducting leads in controlled and tunable setups. the equilibrium josephson current was measured in on-chip superconducting quantum interference devices, and subgap states were investigated using weakl... | the anderson-josephson quantum dot—a theory perspective |
the quantum hydrodynamic (qhd) model of charged spin-1/2 particles contains physical quantities defined for all particles of a species including particles with spin-up and with spin-down. different populations of states with different spin directions are included in the spin density (the magnetization). in this paper i... | separated spin-up and spin-down quantum hydrodynamics of degenerated electrons: spin-electron acoustic wave appearance |
we propose to explore the quantum nature of gravity using the correlation of light between two optomechanical cavities, and the quantumness of the correlation is witnessed by squeezing. as long as the gravity between the end mirrors of two cavities is quantum in the newtonian limit, we show that the squeezing is always... | quantum correlations of light mediated by gravity |
entanglement between distant massive mechanical oscillators is of particular interest in quantum-enabled devices due to its potential applications in distributed quantum information processing. here we propose how to achieve nonreciprocal remote entanglement between two spatially separated mechanical oscillators within... | nonreciprocal enhancement of remote entanglement between nonidentical mechanical oscillators |
the exploration of quantum‑inspired symmetries in optical and photonic systems has witnessed immense research interest both fundamentally and technologically in a wide range of subject areas in physics and engineering. one of the principal emerging fields in this context is non‑hermitian physics based on parity‑time sy... | parity‑time symmetry in non‑hermitian complex optical media |
the rich dynamics and phase structure of driven systems include the recently described phenomenon of the "discrete time crystal" (dtc), a robust phase which spontaneously breaks the discrete time translation symmetry of its driving hamiltonian. experiments in trapped ions and diamond nitrogen vacancy centers have recen... | 31p nmr study of discrete time-crystalline signatures in an ordered crystal of ammonium dihydrogen phosphate |
we propose a novel mechanism for a nonequilibrium phase transition in a u (1 )-broken phase of an electron-hole-photon system, from a bose-einstein condensate of polaritons to a photon laser, induced by the non-hermitian nature of the condensate. we show that a (uniform) steady state of the condensate can always be cla... | non-hermitian phase transition from a polariton bose-einstein condensate to a photon laser |
how a many-body quantum system thermalizes—or fails to do so—under its own interaction is a fundamental yet elusive concept. here we demonstrate nuclear magnetic resonance observation of the emergence of prethermalization by measuring out-of-time ordered correlations. we exploit hamiltonian engineering techniques to tu... | emergent prethermalization signatures in out-of-time ordered correlations |
generalized hydrodynamics is a recent theory that describes the large scale transport properties of one dimensional integrable models. at the heart of this theory lies an exact quantum-classical correspondence, which states that the flows of the conserved quantities are essentially quasiclassical even in the interactin... | algebraic construction of current operators in integrable spin chains |
transfer matrices and matrix product operators play a ubiquitous role in the field of many-body physics. this review gives an idiosyncratic overview of applications, exact results, and computational aspects of diagonalizing transfer matrices and matrix product operators. the results in this paper are a mixture of class... | diagonalizing transfer matrices and matrix product operators: a medley of exact and computational methods |
many-body localization has become an important phenomenon for illuminating a potential rift between nonequilibrium quantum systems and statistical mechanics. however, the nature of the transition between ergodic and localized phases in models displaying many-body localization is not yet well understood. assuming that t... | many-body localization transition: schmidt gap, entanglement length, and scaling |
the electroreduction of co2 is a promising technology for carbon utilization. although electrolysis of co2 or co2-derived co can generate important industrial multicarbon feedstocks such as ethylene, ethanol, n-propanol and acetate, most efforts have been devoted to promoting c-c bond formation. here, we demonstrate th... | formation of carbon-nitrogen bonds in carbon monoxide electrolysis |
we explore the fock-space structure of eigenstates across the many-body localization (mbl) transition in a disordered, interacting quantum spin-1/2 chain. eigenstate expectation values of spatially local observables, which distinguish an mbl phase from an ergodic one, can be represented in terms of eigenstate amplitude... | fock-space anatomy of eigenstates across the many-body localization transition |
we analyze the error of approximating gibbs states of local quantum spin hamiltonians on lattices with projected entangled pair states (peps) as a function of the bond dimension (d ), temperature (β-1), and system size (n ). first, we introduce a compression method in which the bond dimension scales as d =eo ( log22(n ... | approximating gibbs states of local hamiltonians efficiently with projected entangled pair states |
in a variant of communication complexity tasks, two or more separated parties cooperate to compute a function of their local data, using a limited amount of communication. it is known that communication of quantum systems and shared entanglement can increase the probability for the parties to arrive at the correct valu... | quantum superposition of the order of parties as a communication resource |
dissociation of quarkonium in quark-gluon plasma (qgp) is a long standing topic in relativistic heavy-ion collisions because it has been believed to signal one of the fundamental natures of the qgp -- debye screening due to the liberation of color degrees of freedom. among recent new theoretical developments is the app... | quarkonium in quark-gluon plasma: open quantum system approaches re-examined |
we study the matrix elements of local operators in the eigenstates of the integrable xxz chain and of the quantum-chaotic model obtained by locally perturbing the xxz chain with a magnetic impurity. we show that, at frequencies that are polynomially small in the system size, the behavior of the variances of the off-dia... | low-frequency behavior of off-diagonal matrix elements in the integrable xxz chain and in a locally perturbed quantum-chaotic xxz chain |
maximally entangled bipartite unitary operators or gates find various applications from quantum information to many-body physics wherein they are building blocks of minimal models of quantum chaos. in the latter case, they are referred to as "dual unitaries." dual unitary operators that can create the maximum average e... | creating ensembles of dual unitary and maximally entangling quantum evolutions |
in "planckian metals," electrons dissipate energy at the fastest possible rate allowed by the fundamental laws of quantum mechanics, resulting in a linear temperature dependence of their electrical resistivity. although observed for a number of quantum materials, this phenomenon lacks a general theoretical understandin... | linear resistivity and sachdev-ye-kitaev (syk) spin liquid behavior in a quantum critical metal with spin-1/2 fermions |
monolayers of transition metal dichalcogenides (tmds) are characterized by an extraordinarily strong coulomb interaction giving rise to tightly bound excitons with binding energies of hundreds of mev. excitons dominate the optical response as well as the ultrafast dynamics in tmds. as a result, a microscopic understand... | exciton relaxation cascade in two-dimensional transition metal dichalcogenides |
dynamical phase transitions (dpts), characterized by nonanalytic behaviors in time domain, extend the equilibrium phase transitions to far-from-equilibrium situations. it has been predicted that dpts can be precisely identified by the discontinuities of the pancharatnam geometric phase (pgp) during the time evolution. ... | observation of dynamical phase transitions in a topological nanomechanical system |
we consider a quantum system strongly coupled to multiple heat baths at different temperatures. quantum heat transport phenomena in this system are investigated using two definitions of the heat current: one in terms of the system energy and the other in terms of the bath energy. when we consider correlations among sys... | quantum heat current under non-perturbative and non-markovian conditions: applications to heat machines |
exponential growth of thermal out-of-time-order correlator (otoc) is an indicator of a possible gravity dual, and a simple toy quantum model showing the growth is being looked for. we consider a system of two harmonic oscillators coupled nonlinearly with each other, and numerically observe that the thermal otoc grows e... | out-of-time-order correlator in coupled harmonic oscillators |
the ability to manipulate single photons is of critical importance for fundamental quantum optics studies and practical implementations of quantum communications. while extraordinary progresses have been made in controlling spatial, temporal, spin and orbit angular momentum degrees of freedom, frequency-domain control ... | integrated optomechanical single-photon frequency shifter |
explaining quantum many-body dynamics is a long-held goal of physics. a rigorous operator algebraic theory of dynamics in locally interacting systems in any dimension is provided here in terms of time-dependent equilibrium (gibbs) ensembles. the theory explains dynamics in closed, open, and time-dependent systems, prov... | unified theory of local quantum many-body dynamics: eigenoperator thermalization theorems |
preface; 1. thermodynamics and statistical mechanics review; 2. ising model in d = 0 and d = 1; 3. statistical to quantum mechanics; 4. quantum to statistical mechanics; 5. feynman path integral; 6. coherent state path integrals for spins, bosons and fermions; 7. the two-dimensional ising model; 8. exact solution of th... | quantum field theory and condensed matter |
elemental phosphorus is attracting growing interest across fundamental and applied fields of research. however, atomistic simulations of phosphorus have remained an outstanding challenge. here, we show that a universally applicable force field for phosphorus can be created by machine learning (ml) from a suitably chose... | a general-purpose machine-learning force field for bulk and nanostructured phosphorus |
the berezinskii-kosterlitz-thouless (bkt) mechanism, building upon proliferation of topological defects in 2d systems, is the first example of phase transition beyond the landau-ginzburg paradigm of symmetry breaking. such a topological phase transition has long been sought yet undiscovered directly in magnetic materia... | evidence of the berezinskii-kosterlitz-thouless phase in a frustrated magnet |
how quantum information is scrambled in the global degrees of freedom of nonequilibrium many-body systems is a key question to understand local thermalization. a consequence of scrambling is that in the scaling limit the mutual information between two intervals vanishes at all times, i.e., it does not exhibit a peak at... | quantum information scrambling after a quantum quench |
we construct classes of superconformal theories elements of which are labeled by punctured riemann surfaces. degenerations of the surfaces correspond, in some cases, to weak coupling limits. different classes are labeled by two integers ( n, k). the k = 1 case coincides with an - 1 theories of class and simple examples... | theories of class |
the thermodynamic framework of repeated interactions is generalized to an arbitrary open quantum system in contact with a heat bath. based on these findings, the theory is then extended to arbitrary measurements performed on the system. this constitutes a direct experimentally testable framework in strong coupling quan... | repeated interactions and quantum stochastic thermodynamics at strong coupling |
a sudden quantum quench of a bloch band from one topological phase toward another has been shown to exhibit an intimate connection with the notion of a dynamical quantum phase transition (dqpt), where the returning probability of the quenched state to the initial state—i.e., the loschmidt echo—vanishes at critical time... | dynamical quantum phase transitions: role of topological nodes in wave function overlaps |
controlling and manipulating quanta of coherent acoustic vibrations—phonons—in integrated circuits has recently drawn a lot of attention, since phonons can function as unique links between radiofrequency and optical signals, allow access to quantum regimes and offer advanced signal processing capabilities. recent appro... | a chip-integrated coherent photonic-phononic memory |
shortcuts to adiabaticity provide fast protocols for quantum state preparation in which the use of auxiliary counterdiabatic controls circumvents the requirement of slow driving in adiabatic strategies. while their development is well established in simple systems, their engineering and implementation are challenging i... | shortcuts to adiabaticity in krylov space |
in this work, we present the inverted harmonic oscillator (iho) hamiltonian as a paradigm to understand the quantum mechanics of scattering and time-decay in a diverse set of physical systems. as one of the generators of area preserving transformations, the iho hamiltonian can be studied as a dilatation generator, sque... | physics of the inverted harmonic oscillator: from the lowest landau level to event horizons |
we consider a unitary circuit where the underlying gates are chosen to be r-matrices satisfying the yang-baxter equation and correlation functions can be expressed through a transfer matrix formalism. these transfer matrices are no longer hermitian and differ from the ones guaranteeing local conservation laws, but rema... | correlations and commuting transfer matrices in integrable unitary circuits |
we investigate the entanglement dynamics in a free-fermion chain initially prepared in a fermi sea and subjected to localized losses (dissipative impurity). we derive a formula describing the dynamics of the entanglement entropies in the hydrodynamic limit of long times and large intervals. the result depends only on t... | unbounded entanglement production via a dissipative impurity |
entanglement is one of the most intriguing aspects of quantum mechanics and lies at the heart of the ongoing second quantum revolution, where it is a resource that is used in quantum key distribution, quantum computing, and quantum teleportation. we report experiments demonstrating the crucial role that entanglement pl... | experimental control of quantum-mechanical entanglement in an attosecond pump-probe experiment |
the gap of the liouvillian spectrum gives the asymptotic decay rate of a quantum dissipative system, and therefore its inverse has been identified as the slowest relaxation time. contrary to this common belief, we show that the relaxation time due to diffusive transports in a boundary dissipated many-body quantum syste... | resolving a discrepancy between liouvillian gap and relaxation time in boundary-dissipated quantum many-body systems |
it is an open question how well tensor network states in the form of an infinite projected entangled-pair states (ipeps) tensor network can approximate gapless quantum states of matter. here we address this issue for two different physical scenarios: (i) a conformally invariant (2 +1 )d quantum critical point in the in... | finite correlation length scaling in lorentz-invariant gapless ipeps wave functions |
we study quenching dynamics of a one-dimensional transverse ising chain with nearest neighbor antiferromagnetic interactions in the presence of a longitudinal field which renders the model nonintegrable. the dynamics of the spin chain is studied following a slow (characterized by a rate) or sudden quenches of the longi... | quenches and dynamical phase transitions in a nonintegrable quantum ising model |
a method to study strongly interacting quantum many-body systems at and away from criticality is proposed. the method is based on a mera-like tensor network that can be efficiently and reliably contracted on a noisy quantum computer using a number of qubits that is much smaller than the system size. we prove that the o... | robust entanglement renormalization on a noisy quantum computer |
we demonstrate a peculiar mechanism for the formation of bound states of light pulses of substantially different optical frequencies, in which pulses are strongly bound across a vast frequency gap. this is enabled by a propagation constant with two separate regions of anomalous dispersion. the resulting soliton compoun... | soliton molecules with two frequencies |
we derive a system of tba equations governing the exact wkb periods in one-dimensional quantum mechanics with arbitrary polynomial potentials. these equations provide a generalization of the ode/im correspondence, and they can be regarded as the solution of a riemann-hilbert problem in resurgent quantum mechanics formu... | tba equations and resurgent quantum mechanics |
in a classically chaotic system that is ergodic, any trajectory will be arbitrarily close to any point of the available phase space after a long time, filling it uniformly. using born's rules to connect quantum states with probabilities, one might then expect that all quantum states in the chaotic regime should be unif... | ubiquitous quantum scarring does not prevent ergodicity |
in quantum materials, degeneracies and frustrated interactions can have a profound impact on the emergence of long-range order, often driving strong fluctuations that suppress functionally relevant electronic or magnetic phases1-7. engineering the atomic structure in the bulk or at heterointerfaces has been an importan... | photo-induced high-temperature ferromagnetism in ytio3 |
using the framework of infinite matrix product states, the existence of an anomalous dynamical phase for the transverse-field ising chain with sufficiently long-range interactions was first reported in j. c. halimeh and v. zauner-stauber [phys. rev. b 96, 134427 (2017), 10.1103/physrevb.96.134427], where it was shown t... | probing the anomalous dynamical phase in long-range quantum spin chains through fisher-zero lines |
the weak ergodicity breaking induced by quantum many-body scars (qmbss) represents an intriguing concept that has received great attention in recent years due to its relation to unusual nonequilibrium behavior. here, we reveal that this phenomenon can occur in a particular regime of a lattice gauge theory, where qmbss ... | scar states in deconfined z2 lattice gauge theories |
pseudo-entropy is an interesting quantity with a simple gravity dual, which generalizes entanglement entropy such that it depends on both an initial and a final state. here we reveal the basic properties of pseudo-entropy in quantum field theories by numerically calculating this quantity for a set of two-dimensional fr... | pseudo-entropy in free quantum field theories |
recent experimental observation of weak ergodicity breaking in rydberg atom quantum simulators has sparked interest in quantum many-body scars—eigenstates which evade thermalization at finite energy densities due to novel mechanisms that do not rely on integrability or protection by a global symmetry. a salient feature... | extensive multipartite entanglement from su(2) quantum many-body scars |
we consider a class of tripartite systems for which two d-dimensional qfts are cross-coupled via a third d + 1-dimensional "messenger" qft. we analyse in detail the example of a pair of one-dimensional matrix quantum mechanics) coupled via a twodimensional theory of the bf-type and compute its partition function and s... | interacting systems and wormholes |
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