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superfluidity in its various forms has been of interest since the observation of frictionless flow in liquid helium ii1,2. in three spatial dimensions it is conceptually associated with the emergence of long-range order at a critical temperature. one of the hallmarks of superfluidity, as predicted by the two-fluid mode... | observation of first and second sound in a bkt superfluid |
nascent platforms for programmable quantum simulation offer unprecedented access to new regimes of far-from-equilibrium quantum many-body dynamics in almost isolated systems. here achieving precise control over quantum many-body entanglement is an essential task for quantum sensing and computation. extensive theoretica... | dynamical topological phase realized in a trapped-ion quantum simulator |
magnon-phonon scattering (mps) has attracted widespread attention in quantum heat/spin transport across the ferromagnetic/nonmagnetic (f/n) interfaces, with the rapid progress of experiments on spin caloritronics in recent years. however, the lack of theoretical methods, accounting for the mps rigorously, has seriously... | quantum mechanical modeling of magnon-phonon scattering heat transport across three-dimensional ferromagnetic/nonmagnetic interfaces |
given a statistical ensemble of quantum states, the corresponding page curve quantifies the average entanglement entropy associated with each possible spatial bipartition of the system. in this work, we study a natural extension in the presence of a conservation law and introduce the symmetry-resolved page curves, char... | symmetry-resolved page curves |
rotational optomechanics strives to gain quantum control over mechanical rotors by harnessing the interaction of light and matter. we optically trap a dielectric nanodumbbell in a linearly polarized laser field, where the dumbbell represents a nanomechanical librator. using measurement-based parametric feedback control... | sub-kelvin feedback cooling and heating dynamics of an optically levitated librator |
recently, apparent nonphysical implications of non-hermitian quantum mechanics (nhqm) have been discussed in the literature. in particular, the apparent violation of the no-signaling theorem, discrimination of nonorthogonal states, and the increase of quantum entanglement by local operations were reported, and therefor... | non-hermitian hamiltonians and no-go theorems in quantum information |
reliable simulations of correlated quantum systems, including high-temperature superconductors and frustrated magnets, are increasingly desired nowadays to further our understanding of essential features in such systems. quantum monte carlo (qmc) is a unique numerically exact and intrinsically unbiased method to simula... | sign-problem-free fermionic quantum monte carlo: developments and applications |
the out-of-time-ordered correlator (otoc) diagnoses quantum chaos and the scrambling of quantum information via the spread of entanglement. the otoc encodes forward and reverse evolutions and has deep connections with the flow of time. so do fluctuation relations such as jarzynski's equality, derived in nonequilibrium ... | jarzynski-like equality for the out-of-time-ordered correlator |
we study photon blockade and antibunching in the cavity of an optomechanical system in which the mechanical resonator is coupled to a two-level system (tls). in particular, we analyze the effects of the coupling strength (to the mechanical mode), transition frequency, and decay rate of tls on the photon blockade. the s... | tunable photon blockade in a hybrid system consisting of an optomechanical device coupled to a two-level system |
quantum dynamical maps provide suitable mathematical representation of quantum evolutions. when representing quantum states by density operators, the evident requirements for any dynamical map are positivity and trace-preservation. however, these properties are not consistent with quantum mechanics of composite systems... | dynamical maps beyond markovian regime |
nonlinear optical processes, such as harmonic generation, are of great interest for various applications, e.g., microscopy, therapy, and frequency conversion. however, high-order harmonic conversion is typically much less efficient than low-order, due to the weak intrinsic response of the higher-order nonlinear process... | ultra-strong nonlinear optical processes and trigonal warping in mos2 layers |
hot carriers (hc) generated by surface plasmon polaritons (spps) in noble metals are promising for application in optoelectronics, plasmonics and renewable energy. however, existing models fail to explain key quantitative details of spp-to-hc conversion experiments. here we develop a quantum mechanical framework and ap... | theory and computation of hot carriers generated by surface plasmon polaritons in noble metals |
the properties of a strongly correlated many-body quantum system, from the presence of topological order to the onset of quantum criticality, leave a footprint in its entanglement spectrum. the entanglement spectrum is composed by the eigenvalues of the density matrix representing a subsystem of the whole original syst... | quantum simulation and spectroscopy of entanglement hamiltonians |
it has been proposed that the deconfined criticality in (2 +1 )d —the quantum phase transition between a néel antiferromagnet and a valence-bond solid (vbs)—may actually be pseudocritical, in the sense that it is a weakly first-order transition with a generically long correlation length. the underlying field theory of ... | theory of deconfined pseudocriticality |
optomechanical systems offer new opportunities in quantum information processing and quantum sensing. many solid-state quantum devices operate at millikelvin temperatures—however, it has proven challenging to operate nanoscale optomechanical devices at these ultralow temperatures due to their limited thermal conductanc... | two-dimensional optomechanical crystal cavity with high quantum cooperativity |
using a new approximate strong-randomness renormalization group (rg), we study the many-body localized (mbl) phase and phase transition in one-dimensional quantum systems with short-range interactions and quenched disorder. our rg is built on those of zhang et al. [phys. rev. b 93, 224201 (2016), 10.1103/physrevb.93.22... | renormalization-group study of the many-body localization transition in one dimension |
we study relaxation times, also called mixing times, of quantum many-body systems described by a lindblad master equation. we in particular study the scaling of the spectral gap with the system length, the so-called dynamical exponent, identifying a number of transitions in the scaling. for systems with bulk dissipatio... | relaxation times of dissipative many-body quantum systems |
the loschmidt echo is a purely quantum-mechanical quantity whose determination for large quantum many-body systems requires an exceptionally precise knowledge of all eigenstates and eigenenergies. one might therefore be tempted to dismiss the applicability of any approximations to the underlying time evolution as hopel... | dynamical quantum phase transitions: a geometric picture |
the functional renormalization group (frg) approach is a powerful tool for studies of a large variety of systems, ranging from statistical physics over the theory of the strong interaction to gravity. the practical application of this approach relies on the derivation of so-called flow equations, which describe the cha... | numerical fluid dynamics for frg flow equations: zero-dimensional qfts as numerical test cases. i. the o (n ) model |
in the presence of symmetry, entanglement measures of quantum many-body states can be decomposed into contributions from distinct symmetry sectors. here we investigate the decomposability of negativity, a measure of entanglement between two parts of a generally open system in a mixed state. while the entanglement entro... | imbalance entanglement: symmetry decomposition of negativity |
it is proposed that a complete understanding of two-dimensional quantum gravity and its emergence in random matrix models requires fully embracing {\it both} wigner (statistics) and 't hooft (geometry). using non-perturbative definitions of random matrix models that yield various jt gravity and jt supergravity models o... | the microstate physics of jt gravity and supergravity |
in a quantum many-body system that possesses an additive conserved quantity, the entanglement entropy of a subsystem can be resolved into a sum of contributions from different sectors of the subsystem’s reduced density matrix, each sector corresponding to a possible value of the conserved quantity. recent studies have ... | symmetry resolved entanglement: exact results in 1d and beyond |
engines are systems and devices that convert one form of energy into another, typically into a more useful form that can perform work. in the classical setup, physical, chemical, and biological engines largely involve the conversion of heat into work. this energy conversion is at the core of thermodynamic laws and prin... | quantum engines and refrigerators |
energy decay plays a central role in a wide range of phenomena, such as optical emission, nuclear fission, and dissipation in quantum systems. energy decay is usually described as a system leaking energy irreversibly into an environmental bath. here, we report on energy decay measurements in nanomechanical systems base... | energy-dependent path of dissipation in nanomechanical resonators |
we introduce and study the dynamical probes of band-structure topology in the postquench time evolution of quantum many-body systems initialized in mixed states. our construction generalizes the notion of dynamical quantum phase transitions (dqpts), a real-time counterpart of conventional equilibrium phase transitions ... | dynamical topological quantum phase transitions for mixed states |
we study the quantum speed limit for open quantum systems described by the lindblad master equation. the obtained inequality shows a trade-off relation between the operation time and the physical quantities such as the energy fluctuation and the entropy production. we further identify a quantity characterizing the spee... | speed limit for open quantum systems |
the control of many-body quantum dynamics in complex systems is a key challenge in the quest to reliably produce and manipulate large-scale quantum entangled states. recently, quench experiments in rydberg atom arrays [bluvstein et al. science 371, 1355 (2021), 10.1126/science.abg2530] demonstrated that coherent reviva... | discrete time-crystalline order enabled by quantum many-body scars: entanglement steering via periodic driving |
quasi-exactly solvable schrödinger equations occupy an intermediate place between exactly-solvable (e.g. the harmonic oscillator and coulomb problems, etc.) and non-solvable ones. mainly, they were discovered in the 1980s. their major property is an explicit knowledge of several eigenstates while the remaining ones are... | one-dimensional quasi-exactly solvable schrödinger equations |
in 1935, einstein, podolsky, and rosen (epr) formulated an apparent paradox of quantum theory [phys. rev. 47, 777 (1935), 10.1103/physrev.47.777]. they considered two quantum systems that were initially allowed to interact and were then later separated. a measurement of a physical observable performed on one system the... | einstein-podolsky-rosen paradox and quantum entanglement at subnucleonic scales |
we study the quantum dynamics of a simple translation invariant, center-of-mass (com) preserving model of interacting fermions in one dimension (1d), which arises in multiple experimentally realizable contexts. we show that this model naturally displays the phenomenology associated with fractonic systems, wherein singl... | thermalization and its absence within krylov subspaces of a constrained hamiltonian |
non-hermitian topological phases exhibit a number of exotic features that have no hermitian counterparts, including the skin effect and breakdown of the conventional bulk-boundary correspondence. here, we implement the non-hermitian su-schrieffer-heeger hamiltonian, which is a prototypical model for studying non-hermit... | observation of non-hermitian topology with nonunitary dynamics of solid-state spins |
topological insulators are new phases of matter whose properties are derived from a number of qualitative yet robust topological invariants rather than specific geometric features or constitutive parameters. their salient feature is that they conduct localized waves along edges and interfaces with negligible scattering... | a study of topological effects in 1d and 2d mechanical lattices |
this work aims at determining whether artificial intelligence can recognize a phase transition without prior human knowledge. if this were successful, it could be applied to, for instance, analyzing data from the quantum simulation of unsolved physical models. toward this goal, we first need to apply the machine learni... | machine learning of frustrated classical spin models. i. principal component analysis |
we propose that holographic spacetimes can be regarded as collections of quantum circuits based on path-integrals. we relate a codimension one surface in a gravity dual to a quantum circuit given by a path-integration on that surface with an appropriate uv cut off. our proposal naturally generalizes the conjectured dua... | holographic spacetimes as quantum circuits of path-integrations |
the quantum approximate optimization algorithm (qaoa) is a prospective near-term quantum algorithm due to its modest circuit depth and promising benchmarks. however, an external parameter optimization required in qaoa could become a performance bottleneck. this motivates studies of the optimization landscape and search... | quantum annealing initialization of the quantum approximate optimization algorithm |
lattice gauge theories are fundamental to our understanding of high-energy physics. nevertheless, the search for suitable platforms for their quantum simulation has proven difficult. we show that the abelian higgs model in 1 +1 dimensions is a prime candidate for an experimental quantum simulation of a lattice gauge th... | quantum simulation of the universal features of the polyakov loop |
we show that dssyk amplitudes are reproduced by considering the quantum mechanics of a constrained particle on the quantum group su$_q(1,1)$. we construct its left-and right-regular representations, and show that the representation matrices reproduce two-sided wavefunctions and correlation functions of dssyk. we then c... | dynamical actions and q-representation theory for double-scaled syk |
information is physical but information is also processed in finite time. where computing protocols are concerned, finite-time processing in the quantum regime can dynamically generate coherence. here we show that this can have significant thermodynamic implications. we demonstrate that quantum coherence generated in t... | quantum fluctuations hinder finite-time information erasure near the landauer limit |
investigating many-body localization (mbl) using exact numerical methods is limited by the exponential growth of the hilbert space. however, localized eigenstates display multifractality and only extend over a vanishing fraction of the hilbert space. here, building on this remarkable property, we develop a simple yet e... | hilbert-space fragmentation, multifractality, and many-body localization |
relaxation to a thermal state is the inevitable fate of nonequilibrium interacting quantum systems without special conservation laws. while thermalization in one-dimensional systems can often be suppressed by integrability mechanisms, in two spatial dimensions thermalization is expected to be far more effective due to ... | stabilizing two-dimensional quantum scars by deformation and synchronization |
we study the transition between integrable and chaotic behavior in dissipative open quantum systems, exemplified by a boundary driven quantum spin chain. the repulsion between the complex eigenvalues of the corresponding liouville operator in radial distance s is used as a universal measure. the corresponding level spa... | universal signature from integrability to chaos in dissipative open quantum systems |
the breaking of the continuous time-translation symmetry manifests, in markovian open quantum systems, through the emergence of nonstationary dynamical phases. systems that display nonequilibrium transitions into these phases are referred to as time crystals, and they can be realized, for example, in many-body systems ... | exact solution of a boundary time-crystal phase transition: time-translation symmetry breaking and non-markovian dynamics of correlations |
we derive general constraints on the existence of many-body localized (mbl) phases in the presence of global symmetries, and show that mbl is not possible with symmetry groups that protect multiplets (e.g., all non-abelian symmetry groups). based on simple representation theoretic considerations, we derive general merm... | symmetry constraints on many-body localization |
the notion of non-hermitian optics and photonics rooted in quantum mechanics and photonic systems has recently attracted considerable attention ushering in tremendous progress on theoretical foundations and photonic applications, benefiting from the flexibility of photonic platforms. in this review, we first introduce ... | topological physics of non-hermitian optics and photonics: a review |
we construct the finite-temperature dynamical phase diagram of the fully connected transverse-field ising model from the vantage point of two disparate concepts of dynamical criticality. an analytical derivation of the classical dynamics and exact diagonalization simulations are used to study the dynamics after a quant... | concurrence of dynamical phase transitions at finite temperature in the fully connected transverse-field ising model |
topological protection offers unprecedented opportunities for wave manipulation and energy transport in various fields of physics, including elasticity, acoustics, quantum mechanics, and electromagnetism. distinct classes of topological waves have been investigated by establishing analogs with the quantum, spin, and va... | valley-based splitting of topologically protected helical waves in elastic plates |
we study theoretically and experimentally the behavior of a strongly confined dipolar bose-einstein condensate in the regime of quantum-mechanical stabilization by beyond-mean-field effects. theoretically, we demonstrate that self-organized "striped" ground states are predicted in the framework of the extended gross-pi... | striped states in a many-body system of tilted dipoles |
motional control of levitated nanoparticles relies on either autonomous feedback via a cavity or measurement-based feedback via external forces. recent demonstrations of the measurement-based ground-state cooling of a single nanoparticle employ linear velocity feedback, also called cold damping, and require the use of ... | scalable all-optical cold damping of levitated nanoparticles |
we report an efficient mechanism to generate a squeezed state of a mechanical mirror in an optomechanical system. we use an especially tuned parametric amplifier (pa) inside the cavity and the parametric photon phonon processes to transfer quantum squeezing from photons to phonons with almost 100% efficiency. we get 50... | strong mechanical squeezing and its detection |
many-body systems with both coherent dynamics and dissipation constitute a rich class of models which are nevertheless much less explored than their dissipationless counterparts. the advent of numerous experimental platforms that simulate such dynamics poses an immediate challenge to systematically understand and class... | nonequilibrium many-body steady states via keldysh formalism |
preparing mechanical systems in their lowest possible entropy state, the quantum ground state, starting from a room temperature environment is a key challenge in quantum optomechanics. this would not only enable creating quantum states of truly macroscopic systems, but at the same time also lay the groundwork for a new... | feedback cooling of a room temperature mechanical oscillator close to its motional ground state |
quantum time crystals are systems characterized by spontaneously emerging periodic order in the time domain1. while originally a phase of broken time translation symmetry was a mere speculation2, a wide range of time crystals has been reported3-5. however, the dynamics and interactions between such systems have not bee... | ac josephson effect between two superfluid time crystals |
molscat is a general-purpose program for quantum-mechanical calculations on nonreactive atom-atom, atom-molecule and molecule-molecule collisions. it constructs the coupled-channel equations of atomic and molecular scattering theory, and solves them by propagating the wavefunction or log-derivative matrix outwards from... | molscat: a program for non-reactive quantum scattering calculations on atomic and molecular collisions |
the hungarian physicist eugene wigner introduced random matrix models in physics to describe the energy spectra of atomic nuclei. as such, the main goal of random matrix theory (rmt) has been to derive the eigenvalue statistics of matrices drawn from a given distribution. the wigner approach gives powerful insights int... | a tale of two hungarians: tridiagonalizing random matrices |
scrambling of quantum information in unitary evolution can be hindered due to measurements and localization, which pin quantum mechanical wave functions in real space, suppressing entanglement in the steady state. in monitored free-fermionic models, the steady state undergoes an entanglement transition from a logarithm... | disordered monitored free fermions |
the laws of thermodynamics put limits to the efficiencies of thermal machines. analogues of these laws are now established for quantum engines weakly and passively coupled to the environment providing a framework to find improvements to their performance. systems whose interaction with the environment is actively contr... | the thermodynamic cost of driving quantum systems by their boundaries |
lithium niobate (ln) exhibits unique material characteristics that have found many important applications. scaling ln devices down to a nanoscopic scale can dramatically enhance light-matter interaction that would enable nonlinear and quantum photonic functionalities beyond the reach of conventional means. however, dev... | high-quality lithium niobate photonic crystal nanocavities |
a 2d map is created for solid‑state materials based on a quantum‑mechanical description of electron sharing and electron transfer. this map intuitively identifies the fundamental nature of ionic, metallic, and covalent bonding in a range of elements and binary compounds; furthermore, it highlights a distinct region for... | a quantum‑mechanical map for bonding and properties in solids |
the availability of quantum annealing devices with hundreds of qubits has made the experimental demonstration of a quantum speedup for optimization problems a coveted, albeit elusive goal. going beyond earlier studies of random ising problems, here we introduce a method to construct a set of frustrated ising-model opti... | probing for quantum speedup in spin-glass problems with planted solutions |
maxwell's demon explores the role of information in physical processes. employing information about microscopic degrees of freedom, this "intelligent observer" is capable of compensating entropy production (or extracting work), apparently challenging the second law of thermodynamics. in a modern standpoint, it is regar... | experimental rectification of entropy production by maxwell's demon in a quantum system |
finite-temperature spin transport in the quantum heisenberg spin chain is known to be superdiffusive, and has been conjectured to lie in the kardar-parisi-zhang (kpz) universality class. using a kinetic theory of transport, we compute the kpz coupling strength for the heisenberg chain as a function of temperature, dire... | superdiffusion from emergent classical solitons in quantum spin chains |
we propose a different tensor renormalization group algorithm, anisotropic tensor renormalization group (atrg), for lattice models in arbitrary dimensions. the proposed method shares the same versatility with the higher-order tensor renormalization group (hotrg) algorithm, i.e., it preserves the lattice topology after ... | anisotropic tensor renormalization group |
quantum coherence is an essential feature of quantum mechanics which is responsible for the departure between the classical and quantum world. the recently established resource theory of quantum coherence studies possible quantum technological applications of quantum coherence, and limitations that arise if one is lack... | structure of the resource theory of quantum coherence |
in one dimension, the area law and its implications for the approximability by matrix product states are the key to efficient numerical simulations involving quantum states. similarly, in simulations involving quantum operators, the approximability by matrix product operators (in hilbert-schmidt norm) is tied to an ope... | entanglement scaling of operators: a conformal field theory approach, with a glimpse of simulability of long-time dynamics in 1\u2009\u2009+\u2009\u20091d |
spin-flip in purely organic molecular systems is often described as a forbidden process; however, it is commonly observed and utilized to harvest triplet excitons in a wide variety of organic material-based applications. although the initial and final electronic states of spin-flip between the lowest singlet and lowest... | critical role of intermediate electronic states for spin-flip processes in charge-transfer-type organic molecules with multiple donors and acceptors |
it is well known that correlations predicted by quantum mechanics cannot be explained by any classical (local-realistic) theory. the relative strength of quantum and classical correlations is usually studied in the context of bell inequalities, but this tells us little about the geometry of the quantum set of correlati... | geometry of the set of quantum correlations |
understanding the entanglement structure of out-of-equilibrium many-body systems is a challenging yet revealing task. here, we investigate the entanglement dynamics after a quench from a piecewise homogeneous initial state in integrable systems. this is the prototypical setup for studying quantum transport, and it cons... | entanglement and quantum transport in integrable systems |
quantum speed limits (qsls) rule the minimum time for a quantum state to evolve into a distinguishable state in an arbitrary physical process. these fundamental results constrain a notion of distance traveled by the quantum state, known as the bures angle, in terms of the speed of evolution set by nonadiabatic energy f... | probing quantum speed limits with ultracold gases |
primordial perturbations in our universe are believed to have a quantum origin, and can be described by the wavefunction of the universe (or equivalently, cosmological correlators). it follows that these observables must carry the imprint of the founding principle of quantum mechanics: unitary time evolution. indeed, i... | cosmological cutting rules |
the predictive accuracy of machine learning (ml) models of molecular properties depends on the choice of the molecular representation. inspired by the postulates of quantum mechanics, we introduce a hierarchy of representations which meet uniqueness and target similarity criteria. to systematically control target simil... | communication: understanding molecular representations in machine learning: the role of uniqueness and target similarity |
weak values and measurements have been proposed as a means to achieve dramatic enhancements in metrology based on the greatly increased range of possible measurement outcomes. unfortunately, the very large values of measurement outcomes occur with highly suppressed probabilities. this raises three vital questions in we... | precision metrology using weak measurements |
two-electron oxygen photoreduction to hydrogen peroxide (h2o2) is seriously inhibited by its sluggish charge kinetics. herein, a polarization engineering strategy is demonstrated by grafting (thio)urea functional groups onto covalent triazine frameworks (ctfs), giving rise to significantly promoted charge separation/tr... | polarization engineering of covalent triazine frameworks for highly efficient photosynthesis of hydrogen peroxide from molecular oxygen and water |
mechanical degrees of freedom, which have often been overlooked in various quantum systems, have been studied for applications ranging from quantum information processing to sensing. here, we develop a hybrid platform consisting of a magnomechanical cavity and an optomechanical cavity, which are coherently coupled by t... | coherent coupling between phonons, magnons, and photons |
in the time evolution of isolated quantum systems out of equilibrium, local observables generally relax to a long-time asymptotic value, governed by the expectation values (diagonal matrix elements) of the corresponding operator in the eigenstates of the system. the temporal fluctuations around this value, response to ... | off-diagonal matrix elements of local operators in many-body quantum systems |
we consider the nonequilibrium dynamics in quantum field theories (qfts). after being prepared in a density matrix that is not an eigenstate of the hamiltonian, such systems are expected to relax locally to a stationary state. in the presence of local conservation laws, these stationary states are believed to be descri... | generalized gibbs ensembles for quantum field theories |
the displacement of micro-electro-mechanical-systems (mems) cantilevers is used to measure a broad variety of phenomena in devices ranging from force microscopes to biochemical sensors to thermal imaging systems. we demonstrate the first direct measurement of a mems cantilever displacement with a noise floor at 40% of ... | ultrasensitive measurement of microcantilever displacement below the shot-noise limit |
model-independent compact representations of imaginary-time data are presented in terms of the intermediate representation (ir) of analytical continuation. we demonstrate the efficiency of the ir through continuous-time quantum monte carlo calculations of an anderson impurity model. we find that the ir yields a signifi... | compressing green's function using intermediate representation between imaginary-time and real-frequency domains |
we explore a conformal field theoretic interpretation of the holographic entanglement of purification, which is defined as the minimal area of the entanglement wedge cross section. we argue that, in ads3/cft2 , the holographic entanglement of purification agrees with the entanglement entropy for a purified state, obtai... | holographic entanglement of purification from conformal field theories |
physical systems powering motion and creating structure in a fixed amount of time dissipate energy and produce entropy. whether living, synthetic or engineered, systems performing these dynamic functions must balance dissipation and speed. here, we show that rates of energy and entropy exchange are subject to a speed l... | time-information uncertainty relations in thermodynamics |
understanding the influence of measurements on the properties of many-body systems is a fundamental problem in quantum mechanics and for quantum technologies. this paper explores how a finite density of stochastic local measurement modifies a given state's entanglement structure. considering various measurement protoco... | enhanced entanglement in the measurement-altered quantum ising chain |
strongly correlated systems can exhibit unexpected phenomena when brought in a state far from equilibrium. an example is many-body localization, which prevents generic interacting systems from reaching thermal equilibrium even at long times1,2. the stability of the many-body localized phase has been predicted to be hin... | probing the onset of quantum avalanches in a many-body localized system |
quantum many-body scarring (qmbs) is a recently discovered form of weak ergodicity breaking in strongly interacting quantum systems, which presents opportunities for mitigating thermalization-induced decoherence in quantum information processing applications. however, the existing experimental realizations of qmbs are ... | many-body hilbert space scarring on a superconducting processor |
the dynamics of markovian open quantum systems are described by lindblad master equations. for fermionic and bosonic systems that are quasi-free, i.e. with hamiltonians that are quadratic in the ladder operators and lindblad operators that are linear in the ladder operators, we derive the equation of motion for the cov... | solving quasi-free and quadratic lindblad master equations for open fermionic and bosonic systems |
the presence of a global internal symmetry in a quantum many-body system is reflected in the fact that the entanglement between its subparts is endowed with an internal structure, namely it can be decomposed as a sum of contributions associated to each symmetry sector. the symmetry resolution of entanglement measures p... | dynamics of charge-imbalance-resolved entanglement negativity after a quench in a free-fermion model |
the existence of nontrivial berry phases associated with two inequivalent valleys in graphene provides interesting opportunities for investigating the valley-projected topological states. examples of such studies include observation of anomalous quantum hall effect in monolayer graphene, demonstration of topological ze... | nanoscale strain engineering of giant pseudo-magnetic fields, valley polarization, and topological channels in graphene |
we consider a paradigmatic quantum harmonic otto engine operating in finite time. we investigate its performance when shortcut-to-adiabaticity techniques are used to speed up its cycle. we compute efficiency and power by taking the energetic cost of the shortcut driving explicitly into account. we analyze in detail thr... | performance of shortcut-to-adiabaticity quantum engines |
we give a consistent quantum description of time, based on page and wootters's conditional probabilities mechanism, which overcomes the criticisms that were raised against similar previous proposals. in particular we show how the model allows one to reproduce the correct statistics of sequential measurements performed ... | quantum time |
wave-particle duality is one of the basic features of quantum mechanics, giving rise to the use of complex numbers in describing states of quantum systems and their dynamics and interaction. since the inception of quantum theory, it has been debated whether complex numbers are essential or whether an alternative consis... | operational resource theory of imaginarity |
we study optomechanically induced transparency in a microresonator coupled with nanoparticles. by tuning the relative angle of the nanoparticles, exceptional points (eps) emerge periodically in this system and thus strongly modify both the transmission rate and the group delay of the signal. as a result, controllable s... | optomechanically induced transparency at exceptional points |
during recent years the interest to dynamics of quantum systems has grown considerably. quantum many body systems out of equilibrium often manifest behavior, different from the one predicted by standard statistical mechanics and thermodynamics in equilibrium. since the dynamics of a many-body quantum system typically i... | dynamical quantum phase transitions (review article) |
we propose using the optomechanical interaction to create artificial magnetic fields for photons on a lattice. the ingredients required are an optomechanical crystal, i.e. a piece of dielectric with the right pattern of holes, and two laser beams with the right pattern of phases. one of the two proposed schemes is base... | optomechanical creation of magnetic fields for photons on a lattice |
we construct exact steady states of unitary nonequilibrium time evolution in the gapless xxz spin-1/2 chain where integrability preserves ballistic spin transport at long times. we characterize the quasilocal conserved quantities responsible for this feature and introduce a computationally effective way to evaluate the... | nonequilibrium spin transport in integrable spin chains: persistent currents and emergence of magnetic domains |
in any medium there are fluctuations due to temperature or due to the quantum nature of its constituents. if a material body is immersed into such a medium, its shape and the properties of its constituents modify the properties of the surrounding medium and its fluctuations. if in the same medium there is a second body... | critical casimir effect: exact results |
in this paper, we propose a new gravity dual for a 2d bcft with two conformal boundaries by introducing a defect that connects the two end-of-the-world branes. we demonstrate that the bcft dual to this bulk model exhibits a richer lowest spectrum. the corresponding lowest energy eigenvalue can continuously interpolate ... | holographic bcft with a defect on the end-of-the-world brane |
quantum devices for sensing and computing applications require coherent quantum systems, which can be manipulated in fast and robust ways. such quantum control is typically achieved using external electromagnetic fields, which drive the system’s orbital, charge or spin degrees of freedom. however, most existing approac... | strong mechanical driving of a single electron spin |
we study tunable optomechanically induced transparency by controlling the dark-mode effect induced by two mechanical modes coupled to a common cavity field. this is realized by introducing a phase-dependent phonon-exchange interaction, which is used to form a loop-coupled configuration. combining this phase-dependent c... | tunable optomechanically induced transparency by controlling the dark-mode effect |
we study the onset of eigenstate thermalization in the two-dimensional transverse field ising model (2d-tfim) in the square lattice. we consider two nonequivalent hamiltonians: the ferromagnetic 2d-tfim and the antiferromagnetic 2d-tfim in the presence of a uniform longitudinal field. we use full exact diagonalization ... | eigenstate thermalization in the two-dimensional transverse field ising model |
the development of magnetic field sensors for biomedical applications primarily focuses on equivalent magnetic noise reduction or overall design improvement in order to make them smaller and cheaper while keeping the required values of a limit of detection. one of the cutting-edge topics today is the use of magnetic fi... | ultrasensitive magnetic field sensors for biomedical applications |
the intensely studied measurement-induced entanglement phase transition has become a hallmark of nonunitary quantum many-body dynamics. usually, such a transition only appears at the level of each individual quantum trajectory, and is absent for the density matrix averaged over measurement outcomes. in this work, we in... | entanglement steering in adaptive circuits with feedback |
the large-scale properties of homogeneous states after quantum quenches in integrable systems have been successfully described by a semiclassical picture of moving quasiparticles. here we consider the generalisation for the entanglement evolution after an inhomogeneous quench in noninteracting systems in the framework ... | entanglement evolution and generalised hydrodynamics: noninteracting systems |
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