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we investigate many-body dynamics where the evolution is governed by unitary circuits through the lens of `krylov complexity', a recently proposed measure of complexity and quantum chaos. we extend the formalism of krylov complexity to unitary circuit dynamics and focus on floquet circuits arising as the trotter decomp... | krylov complexity and trotter transitions in unitary circuit dynamics |
we explore the nonunitary dynamics of (2 +1 ) -dimensional free fermions and show that the obtained steady state is critical regardless the strength of the nonunitary evolution. numerical results indicate that the entanglement entropy has a logarithmic violation of the area law and the mutual information between two di... | quantum criticality in the nonunitary dynamics of (2 +1 ) -dimensional free fermions |
we present a new holographic duality between q-schwarzian quantum mechanics and liouville gravity. the q-schwarzian is a one parameter deformation of the schwarzian, which is dual to jt gravity and describes the low energy sector of syk. we show that the q-schwarzian in turn is dual to sinh dilaton gravity. this one pa... | the q-schwarzian and liouville gravity |
we study the properties of output distributions of noisy random circuits. we obtain upper and lower bounds on the expected distance of the output distribution from the "useless" uniform distribution. these bounds are tight with respect to the dependence on circuit depth. our proof techniques also allow us to make state... | tight bounds on the convergence of noisy random circuits to the uniform distribution |
in two recent papers [1, 2] we have proposed a program of study which allows us to compute the correlation functions of local and semi-local fields in generalised t t ¯-deformed integrable quantum field theories. this new program, based on the construction of form factors, opens many avenues for future study, one of wh... | entanglement entropy from form factors in t t ¯-deformed integrable quantum field theories |
quantum entanglement is a fundamental property of quantum mechanics. recently, studies have explored entanglement in the $t\bar{t}$ system at the large hadron collider (lhc) when both the top quark and anti-top quark decay leptonically. entanglement is detected via correlations between the polarizations of the top and ... | quantum entanglement and bell inequality violation in semi-leptonic top decays |
one of the most profound questions of mathematical physics is that of establishing from first principles the hydrodynamic equations in large, isolated, strongly interacting many-body systems. this involves understanding relaxation at long times under reversible dynamics, determining the space of emergent collective deg... | hydrodynamic projections and the emergence of linearised euler equations in one-dimensional isolated systems |
in the presence of a global symmetry, the entanglement entropy of a quantum system can be decomposed among the individual symmetry sectors, dubbed symmetry-resolved entanglement entropy. for a conformal field theory with abelian symmetry, it obeys the equipartition theorem in the scaling limit, i.e., at the leading ord... | universal thermal corrections to symmetry-resolved entanglement entropy and full counting statistics |
hawking discovery that black holes can evaporate through radiation emission has posed a number of questions that with time became fundamental hallmarks for a quantum theory of gravity. the most famous one is likely the information paradox, which finds an elegant explanation in the page argument suggesting that a black ... | an entanglement asymmetry study of black hole radiation |
we set out a general protocol for steering the state of a quantum system from an arbitrary initial state toward a chosen target state by coupling it to auxiliary quantum degrees of freedom. the protocol requires multiple repetitions of an elementary step: during each step, the system evolves for a fixed time while coup... | measurement-induced steering of quantum systems |
sign problem in quantum monte carlo (qmc) simulation appears to be an extremely hard yet interesting problem. in this article, we present a pedagogical overview on the origin of the sign problem in various quantum monte carlo simulation techniques, ranging from the world-line and stochastic series expansion monte carlo... | sign problem in quantum monte carlo simulation |
we study the many-body localization transition in one-dimensional hubbard chains using exact diagonalization and quantum chaos indicators. we also study dynamics in the delocalized (ergodic) and localized phases and discuss thermalization and eigenstate thermalization, or the lack thereof, in such systems. consistently... | many-body localization and thermalization in disordered hubbard chains |
we introduce a new class of high-entropy alloys (heas), i.e., quinary (five-component) dual-phase (dp) heas revealing transformation-induced plasticity (trip), designed by using a quantum mechanically based and experimentally validated approach. ab initio simulations of thermodynamic phase stabilities of co20cr20fe40-x... | ab initio assisted design of quinary dual-phase high-entropy alloys with transformation-induced plasticity |
we discuss the role of contextuality within quantum fluctuation theorems, in the light of a recent no-go result by perarnau-llobet et al. we show that any fluctuation theorem reproducing the two-point-measurement scheme for classical states either admits a notion of work quasiprobability or fails to describe protocols ... | quantum fluctuation theorems, contextuality, and work quasiprobabilities |
using a recent proposal of circuit complexity in quantum field theories introduced by jefferson and myers, we compute the time evolution of the complexity following a smooth mass quench characterized by a time scale δ t in a free scalar field theory. we show that the dynamics has two distinct phases, namely an early re... | evolution of complexity following a quantum quench in free field theory |
the standard quantum limit constrains the precision of an oscillator position measurement. it arises from a balance between the imprecision and the quantum backaction of the measurement. however, a measurement of only a single quadrature of the oscillator can evade the backaction and be made with arbitrary precision. h... | quantum backaction evading measurement of collective mechanical modes |
we study the depolarization dynamics of a dense ensemble of dipolar interacting spins, associated with nitrogen-vacancy centers in diamond. we observe anomalously fast, density-dependent, and nonexponential spin relaxation. to explain these observations, we propose a microscopic model where an interplay of long-range i... | depolarization dynamics in a strongly interacting solid-state spin ensemble |
recently, it was understood that modified concepts of locality played an important role in the study of extended quantum systems out of equilibrium, in particular in so-called generalized gibbs ensembles. in this paper, we rigorously study pseudolocal charges and their involvement in time evolutions and in the thermali... | thermalization and pseudolocality in extended quantum systems |
we present a detailed and self-contained analysis of the universal schwingerkeldysh effective field theory which describes macroscopic thermal fluctuations of a relativistic field theory, elaborating on our earlier construction [1]. we write an effective action for appropriate hydrodynamic goldstone modes and fluctuati... | effective action for relativistic hydrodynamics: fluctuations, dissipation, and entropy inflow |
the aim of this paper is to present a comprehensive theory of spintronics phenomena based on the concept of effective gauge field, the spin gauge field. an effective gauge field generally arises when we change a basis to describe system and describes low energy properties of the system. in the case of ferromagnetic met... | effective gauge field theory of spintronics |
by making use of a recently proposed framework for the inference of thermodynamic irreversibility in bosonic quantum systems, we experimentally measure and characterize the entropy production rates in the nonequilibrium steady state of two different physical systems—a micromechanical resonator and a bose-einstein conde... | experimental determination of irreversible entropy production in out-of-equilibrium mesoscopic quantum systems |
the light cone ope limit provides a significant amount of information regarding the conformal field theory (cft), like the high-low temperature limit of the partition function. we started with the light cone bootstrap in the general cft 2 with c > 1. for this purpose, we needed an explicit asymptotic form of the vir... | light cone bootstrap in general 2d cfts and entanglement from light cone singularity |
we consider a chaotic many-body system (i.e., one that satisfies the eigenstate thermalization hypothesis) that is split into two subsystems, with an interaction along their mutual boundary, and study the entanglement properties of an energy eigenstate with nonzero energy density. when the two subsystems have nearly eq... | structure of chaotic eigenstates and their entanglement entropy |
in a quantum system coupled with a non-markovian environment, quantum information may flow out of or into the system. measuring quantum information flow and its sensitivity to perturbations is important for a better understanding of open quantum systems and for the implementation of quantum technologies. information ge... | sensitivity of quantum information to environment perturbations measured with a nonlocal out-of-time-order correlation function |
we propose an efficient microwave-photonic modulator as a resource for stationary entangled microwave-optical fields and develop the theory for deterministic entanglement generation and quantum state transfer in multi-resonant electro-optic systems. the device is based on a single crystal whispering gallery mode resona... | electro-optic entanglement source for microwave to telecom quantum state transfer |
we study the infinite-temperature properties of an infinite sequence of random quantum spin chains using a real-space renormalization group approach, and demonstrate that they exhibit nonergodic behavior at strong disorder. the analysis is conveniently implemented in terms of su (2 )k anyon chains that include the isin... | quantum criticality of hot random spin chains |
we consider an ensemble of indistinguishable quantum machines and show that quantum statistical effects can give rise to a genuine quantum enhancement of the collective thermodynamic performance. when multiple indistinguishable bosonic work resources are coupled to an external system, the internal energy change of the ... | quantum statistical enhancement of the collective performance of multiple bosonic engines |
we show that the entropy production in small open systems coupled to environments made of extended baths is predominantly caused by the displacement of the environment from equilibrium rather than, as often assumed, the mutual information between the system and the environment. the latter contribution is strongly bound... | entropy production in open systems: the predominant role of intraenvironment correlations |
recently it has been suggested that many-body localization (mbl) can occur in translation-invariant systems, and candidate 1d models have been proposed. we find that such models, in contrast to mbl systems with quenched disorder, typically exhibit much more severe finite-size effects due to the presence of two or more ... | many-body localization in disorder-free systems: the importance of finite-size constraints |
engineering strong interactions between quantum systems is essential for many phenomena of quantum physics and technology. typically, strong coupling relies on short-range forces or on placing the systems in high-quality electromagnetic resonators, which restricts the range of the coupling to small distances. we used a... | light-mediated strong coupling between a mechanical oscillator and atomic spins 1 meter apart |
optomechanical couplings involve both beam splitter and two-mode-squeezing types of interactions. while the former underlies the utility of many applications, the latter creates unwanted excitations and is usually detrimental. in this letter, we propose a simple but powerful method based on cavity parametric driving to... | ground-state cooling and high-fidelity quantum transduction via parametrically driven bad-cavity optomechanics |
the notion of measurement is of both foundational and instrumental significance in quantum mechanics, and coherence destroyed by measurements (decoherence) lies at the very heart of quantum to classical transition. qualitative aspects of this spirit have been widely recognized and analyzed ever since the inception of q... | quantum coherence versus quantum uncertainty |
we propose a deterministic scheme for establishing hybrid einstein-podolsky-rosen (epr) entanglement channel between a macroscopic mechanical oscillator and a magnon mode in a distant yttrium-iron-garnet (yig) sphere across about 10 ghz of frequency difference. the system consists of a driven electromechanical cavity w... | einstein-podolsky-rosen entanglement and asymmetric steering between distant macroscopic mechanical and magnonic systems |
most traditional overdamped monostable, bistable and even tristable stochastic resonance (sr) methods have three shortcomings in weak characteristic extraction: (1) their potential structures characterized by single stable-state type are insufficient to match with the complicated and diverse mechanical vibration signal... | an underdamped stochastic resonance method with stable-state matching for incipient fault diagnosis of rolling element bearings |
quantum many-body scars have attracted much interest as a violation of the eigenstate thermalization hypothesis (eth) due to recent experimental observation in rydberg atoms and related theoretical studies. in this paper, we construct a model hosting exact floquet quantum many-body scars, which violate the floquet vers... | exact floquet quantum many-body scars under rydberg blockade |
a remarkable property of quantum mechanics in two-dimensional space is its ability to support `anyons', particles that are neither fermions nor bosons. theory predicts that these exotic excitations can exist as bound states confined near topological defects, such as majorana zero modes trapped in vortices in topologica... | braiding photonic topological zero modes |
we develop a universal approximation for the renyi entropies of a pure state at late times in a non-integrable many-body system, which macroscopically resembles an equilibrium density matrix. the resulting expressions are fully determined by properties of the associated equilibrium density matrix, and are hence indepen... | entanglement entropies of equilibrated pure states in quantum many-body systems and gravity |
we consider a noninteracting many-fermion system populating levels of a unitary random matrix ensemble (equivalent to the q =2 complex sachdev-ye-kitaev model)—a generic model of single-particle quantum chaos. we study the corresponding many-particle level statistics by calculating the spectral form factor analytically... | many-body level statistics of single-particle quantum chaos |
the eigenstate entanglement entropy is a powerful tool to distinguish integrable from generic quantum-chaotic models. in integrable models, the average eigenstate entanglement entropy (over all hamiltonian eigenstates) has a volume-law coefficient that generally depends on the subsystem fraction. in contrast, it is max... | eigenstate entanglement entropy in random quadratic hamiltonians |
a method for analytic continuation of imaginary-time correlation functions (here obtained in quantum monte carlo simulations) to real-frequency spectral functions is proposed. stochastically sampling a spectrum parametrized by a large number of δ functions, treated as a statistical-mechanics problem, it avoids distorti... | constrained sampling method for analytic continuation |
recent experimental breakthroughs produced the first nano heat engines that have the potential to harness quantum resources. an instrumental question is how their performance measures up against the efficiency of classical engines. for single ion engines undergoing quantum otto cycles it has been found that the efficie... | efficiency of harmonic quantum otto engines at maximal power |
the self-learning monte carlo (slmc) method is a general algorithm to speedup mc simulations. its efficiency has been demonstrated in various systems by introducing an effective model to propose global moves in the configuration space. in this paper, we show that deep neural networks can be naturally incorporated into ... | self-learning monte carlo with deep neural networks |
the phenomenon of many-body localization has received a lot of attention recently, both for its implications in condensed-matter physics of allowing systems to be an insulator even at nonzero temperature as well as in the context of the foundations of quantum statistical mechanics, providing examples of systems showing... | many-body localization implies that eigenvectors are matrix-product states |
we analyze the role of indirect quantum measurements in work extraction from quantum systems in nonequilibrium states. in particular, we focus on the work that can be obtained by exploiting the correlations shared between the system of interest and an additional ancilla, where measurement backaction introduces a nontri... | optimal work extraction and thermodynamics of quantum measurements and correlations |
we apply the artificial neural network in a supervised manner to map out the quantum phase diagram of disordered topological superconductors in class diii. given the disorder that keeps the discrete symmetries of the ensemble as a whole, translational symmetry which is broken in the quasiparticle distribution individua... | learning disordered topological phases by statistical recovery of symmetry |
we show how to accurately study two-dimensional quantum critical phenomena using infinite projected entangled-pair states (ipeps). we identify the presence of a finite correlation length in the optimal ipeps approximation to lorentz-invariant critical states which we use to perform a finite correlation length scaling a... | finite correlation length scaling with infinite projected entangled-pair states |
we explain the probe field transmission spectrum under the influence of a strong pump field in a hybrid optomechanical system, composed of an optical cavity, a mechanical resonator, and a two-level atom. we show fast (superluminal) and slow (subluminal) light effects of the transmitted probe field in the hybrid system ... | tunable fast and slow light in a hybrid optomechanical system |
matrix elements of observables in eigenstates of generic hamiltonians are described by the srednicki ansatz within the eigenstate thermalization hypothesis (eth). we study a quantum chaotic spin-fermion model in a one-dimensional lattice, which consists of a spin-1/2 xx chain coupled to a single itinerant fermion. in o... | eigenstate thermalization hypothesis through the lens of autocorrelation functions |
nonlinear relaxation phenomena in three different systems of condensed matter are investigated. (i) first, the phase dynamics in josephson junctions is analyzed. specifically, a superconductor-graphene-superconductor (sgs) system exhibits quantum metastable states, and the average escape time from these metastable stat... | nonlinear relaxation phenomena in metastable condensed matter systems |
we investigate the connection between recent results in quantum thermodynamics and fluctuation relations by adopting a fully quantum mechanical description of thermodynamics. by including a work system whose energy is allowed to fluctuate, we derive a set of equalities that all thermodynamical transitions have to satis... | fluctuating work: from quantum thermodynamical identities to a second law equality |
dynamical phase transitions (dpts) are signaled by the non-analytical time evolution of the dynamical free energy after quenching some global parameters in quantum systems. the dynamical free energy is calculated from the overlap between the initial and the time evolved states (loschmidt amplitude). in a recent study i... | dynamical quantum phase transition and quasi particle excitation |
a many-body localized (mbl) state is a new state of matter emerging in a disordered interacting system at high-energy densities through a disorder-driven dynamic phase transition. the nature of the phase transition and the evolution of the mbl phase near the transition are the focus of intense theoretical studies with ... | many-body localization and transition by density matrix renormalization group and exact diagonalization studies |
we introduce a class of new algebras, the shifted quiver yangians, as the bps algebras for type iia string theory on general toric calabi-yau three-folds. we construct representations of the shifted quiver yangian from general subcrystals of the canonical crystal. we derive our results via equivariant localization for ... | shifted quiver yangians and representations from bps crystals |
we reveal a continuous dynamical heating transition between a prethermal and an infinite-temperature stage in a clean, chaotic periodically driven classical spin chain. the transition time is a steep exponential function of the drive frequency, showing that the exponentially long-lived prethermal plateau, originally ob... | asymptotic prethermalization in periodically driven classical spin chains |
cellular automata are interacting classical bits that display diverse emergent behaviors, from fractals to random-number generators to turing-complete computation. we discover that quantum cellular automata (qca) can exhibit complexity in the sense of the complexity science that describes biology, sociology, and econom... | entangled quantum cellular automata, physical complexity, and goldilocks rules |
experiments performed on strongly interacting rydberg atoms have revealed surprising persistent oscillations of local observables. these oscillations have been attributed to a special set of nonergodic states, referred to as quantum many-body scars. although these states have enriched our understanding of thermalizatio... | fate of quantum many-body scars in the presence of disorder |
ultrasound sensors have wide applications across science and technology. however, improved sensitivity is required for both miniaturisation and increased spatial resolution. here, we introduce cavity optomechanical ultrasound sensing, where dual optical and mechanical resonances enhance the ultrasound signal. we achiev... | precision ultrasound sensing on a chip |
we demonstrate radio-frequency thermometry on a micrometer-sized metallic island below 100 mk. our device is based on a normal-metal-insulator-superconductor tunnel junction coupled to a resonator with transmission readout. in the first generation of the device, we achieve 90 μ k /√{hz } noise-equivalent temperature wi... | fast electron thermometry for ultrasensitive calorimetric detection |
we study the temporal evolution of the entanglement hamiltonian of an interval after a global quantum quench in free lattice models in one spatial dimension. in a harmonic chain we explore a quench of the frequency parameter. in a chain of free fermions at half filling we consider the evolution of the ground state of a... | entanglement hamiltonians in 1d free lattice models after a global quantum quench |
using the operational framework of completely positive, trace preserving operations and thermodynamic fluctuation relations, we derive a lower bound for the heat exchange in a landauer erasure process on a quantum system. our bound comes from a nonphenomenological derivation of the landauer principle which holds for ge... | nonequilibrium quantum landauer principle |
higher-order exceptional points (eps), resulting from non-hermitian degeneracies, have shown greater advantages in sensitive enhancement than second-order eps (ep2s). therefore, seeking higher-order eps in various quantum systems is important for quantum information science. here we propose a benchmark cavity optomecha... | higher-order exceptional point in a pseudo-hermitian cavity optomechanical system |
a full quantum mechanical treatment of open quantum systems via a master equation is often limited by the size of the underlying hilbert space. as an alternative, the dynamics can also be formulated in terms of systems of coupled differential equations for operators in the heisenberg picture. this typically leads to an... | quantumcumulants.jl: a julia framework for generalized mean-field equations in open quantum systems |
experiments have shown that graphene-supported ni-single atom catalysts (ni-sacs) provide a promising strategy for the electrochemical reduction of co2 to co, but the nature of the ni sites (ni-n2c2, ni-n3c1, ni-n4) in ni-sacs has not been determined experimentally. here, we apply the recently developed grand canonical... | reaction mechanism and kinetics for co2 reduction on nickel single atom catalysts from quantum mechanics |
quantum dimer models are known to host topological quantum spin liquid phases, and it has recently become possible to simulate such models with rydberg atoms trapped in arrays of optical tweezers. here, we present large-scale quantum monte carlo simulation results on an extension of the triangular lattice quantum dimer... | triangular lattice quantum dimer model with variable dimer density |
it has been predicted and experimentally demonstrated that by injecting squeezed light into an optomechanical device, it is possible to enhance the precision of a position measurement. here, we present a fundamentally different approach where the squeezing is created directly inside the cavity by a nonlinear medium. co... | intracavity squeezing can enhance quantum-limited optomechanical position detection through deamplification |
we develop a deep learning (dl) framework assisted by differentiable programming for discovery of optimal quantum control protocols under hard constraints. to that end, we use neural network representations to our protocols, whose learning process is done with exact gradients. we find high-quality solutions to the opti... | optimal control of quantum thermal machines using machine learning |
we show that non-markovian effects of the reservoirs can be used as a resource to extract work from an otto cycle. the state transformation under non-markovian dynamics is achieved via a two-step process, namely an isothermal process using a markovian reservoir followed by an adiabatic process. from second law of therm... | thermodynamics of non-markovian reservoirs and heat engines |
we study the dynamics of lattice models of quantum spins one-half, driven by a coherent drive and subject to dissipation. generically the mean-field limit of these models manifests multistable parameter regions of coexisting steady states with different magnetizations. we introduce an efficient scheme accounting for th... | multistability of driven-dissipative quantum spins |
molecular science is governed by the dynamics of electrons and atomic nuclei, and by their interactions with electromagnetic fields. a faithful physicochemical understanding of these processes is crucial for the design and synthesis of chemicals and materials of value for our society and economy. although some problems... | prospects of quantum computing for molecular sciences |
many applications of quantum information processing (qip) require distribution of quantum states in networks, both within and between distant nodes. optical quantum states are uniquely suited for this purpose, as they propagate with ultralow attenuation and are resilient to ubiquitous thermal noise. mechanical systems ... | entanglement of propagating optical modes via a mechanical interface |
quantum interference can limit energy absorption in a continually kicked system through a single-particle ergodicity-breaking mechanism known as dynamical localization1,2. the effect of many-body interactions on dynamically localized states, although important to a fundamental understanding of quantum decoherence, has ... | interaction-driven breakdown of dynamical localization in a kicked quantum gas |
non-hermitian hamiltonians provide a simple picture for inspecting dissipative systems with natural or induced gain and loss. we investigate the floquet dynamical phase transition in the dissipative periodically time-driven xy and extended xy models, where the imaginary terms represent the physical gain and loss during... | dissipative floquet dynamical quantum phase transition |
in the context of ground states of quantum many-body systems, the locality of entanglement between connected regions of space is directly tied to the locality of the corresponding entanglement hamiltonian: the latter is dominated by local, few-body terms. in this work, we introduce the negativity hamiltonian as the (no... | negativity hamiltonian: an operator characterization of mixed-state entanglement |
coherent conversion of photons to magnons, and back, provides a natural mechanism for rapid control of interactions between stationary spins with long coherence times and high-speed photons. despite the large frequency difference between optical photons and magnons, coherent conversion can be achieved through a three-p... | optomagnonics in magnetic solids |
we describe the observed light-baryon spectrum by extending superconformal quantum mechanics to the light front and its embedding in ads space. this procedure uniquely determines the confinement potential for arbitrary half-integer spin. to this end, we show that fermionic wave equations in ads space are dual to light-... | baryon spectrum from superconformal quantum mechanics and its light-front holographic embedding |
we present a variational quantum circuit that produces the singular value decomposition of a bipartite pure state. the proposed circuit, which we name quantum singular value decomposer or qsvd, is made of two unitaries respectively acting on each part of the system. the key idea of the algorithm is to train this circui... | quantum singular value decomposer |
thermodynamics relies on the possibility to describe systems composed of a large number of constituents in terms of few macroscopic variables. its foundations are rooted into the paradigm of statistical mechanics, where thermal properties originate from averaging procedures which smoothen out local details. while undou... | local quantum thermal susceptibility |
out-of-time-order (oto) operators have recently become popular diagnostics of quantum chaos in many-body systems. the usual way they are introduced is via a quantization of classical lyapunov growth, which measures the divergence of classical trajectories in phase space due to the butterfly effect. however, it is not o... | out-of-time-order operators and the butterfly effect |
a major achievement of the past decade has been the realization of macroscopic quantum systems by exploiting the interactions between optical cavities and mechanical resonators. in these systems, phonons are coherently annihilated or created in exchange for photons. similar phenomena have recently been observed through... | tunable phonon-cavity coupling in graphene membranes |
unitary processes allow for the transfer of work to and from hamiltonian systems. however, to achieve nonzero power for the practical extraction of work, these processes must be performed within a finite time, which inevitably induces excitations in the system. we show that depending on the time scale of the process an... | cost of counterdiabatic driving and work output |
amorphous solids exhibit quasiuniversal low temperature anomalies whose origin has been ascribed to localized tunneling defects. using an advanced monte carlo procedure, we create in silico glasses spanning from hyperquenched to ultrastable glasses. using a multidimensional path-finding protocol, we locate tunneling de... | depletion of two-level systems in ultrastable computer-generated glasses |
within the ultimate goal of classifying universality in quantum many-body dynamics, understanding the relation between out-of-equilibrium and equilibrium criticality is a crucial objective. models with power-law interactions exhibit rich well-understood critical behavior in equilibrium, but the out-of-equilibrium pictu... | out-of-equilibrium phase diagram of long-range superconductors |
we investigate heat engines whose working substance is made of two coupled qubits performing a generalized otto cycle by varying their applied magnetic field or their interaction strength during the compression and expansion strokes. during the heating and cooling strokes, the two qubits are coupled to local and common... | quantum correlations and thermodynamic performances of two-qubit engines with local and common baths |
when a quantum phase transition is crossed in finite time, critical slowing down leads to the breakdown of adiabatic dynamics and the formation of topological defects. the average density of defects scales with the quench rate following a universal power law predicted by the kibble-zurek mechanism. we analyze the full ... | universal statistics of topological defects formed in a quantum phase transition |
the interaction of solid-state electronic spins with deformations of their host crystal is an important ingredient in many experiments realizing quantum information processing schemes. here, we theoretically characterize that interaction for a nitrogen-vacancy (nv) center in diamond. we derive the symmetry-allowed hami... | spin-strain interaction in nitrogen-vacancy centers in diamond |
we revisit the old problem of the self-force on a particle moving in a weak-field spacetime in the context of renewed interest in two-body gravitational scattering. we analytically calculate the scalar, electromagnetic, and gravitational self-force on a particle moving on a straight-line trajectory at a large distance ... | self-force effects in post-minkowskian scattering |
the eigenstate thermalization hypothesis (eth) explains why nonintegrable quantum many-body systems thermalize internally if the hamiltonian lacks symmetries. if the hamiltonian conserves one quantity ("charge"), the eth implies thermalization within a charge sector—in a microcanonical subspace. but quantum systems can... | non-abelian eigenstate thermalization hypothesis |
the dynamics of entanglement has recently been realized as a useful probe in studying ergodicity and its breakdown in quantum many-body systems. in this paper, we study theoretically the growth of entanglement in quantum many-body systems and propose a method to measure it experimentally. we show that entanglement grow... | entanglement dynamics in quantum many-body systems |
we introduce a coherence susceptibility method, based on the fact that it signals quantum fluctuations, for identifying quantum phase transitions, which are induced by quantum fluctuations. this method requires no prior knowledge of order parameter, and there is no need for careful considerations concerning the choice ... | coherence susceptibility as a probe of quantum phase transitions |
we investigate quantum synchronization theoretically in a system consisting of two cold ions in microtraps. the ions' motion is damped by a standing-wave laser while also being driven by a blue-detuned laser which results in self-oscillation. working in a nonclassical regime, where these oscillations contain only a few... | spin correlations as a probe of quantum synchronization in trapped-ion phonon lasers |
large dynamical fluctuations—atypical realizations of the dynamics sustained over long periods of time—can play a fundamental role in determining the properties of collective behavior of both classical and quantum nonequilibrium systems. rare dynamical fluctuations, however, occur with a probability that often decays e... | making rare events typical in markovian open quantum systems |
jt gravity has a first-order formulation as a two-dimensional bf theory, which can be viewed as the dimensional reduction of the chern-simons description of 3d3d gravity. we consider {t\overbar{t}}tt¯-type deformations of the (0+1)(0+1)-dimensional dual to this 2d2d bf theory and interpret the deformation as a modifica... | t\\bar{t} in jt gravity and bf gauge theory |
we study the multi-charged moments for two disjoint intervals in the ground state of two 1 + 1 dimensional cfts with central charge c = 1 and global u(1) symmetry: the massless dirac field theory and the compact boson (luttinger liquid). for this purpose, we compute the partition function on the higher genus riemann su... | multi-charged moments of two intervals in conformal field theory |
we investigate approximate emergent non-abelian symmetry in a class of weakly first-order `deconfined' phase transitions using monte carlo simulations and a renormalization group analysis. we study a transition in a 3d classical loop model that is analogous to a deconfined 2 +1 d quantum phase transition in a magnet wi... | emergence and spontaneous breaking of approximate o (4 ) symmetry at a weakly first-order deconfined phase transition |
we investigate the performance of a quantum thermal machine operating in finite time based on shortcut-to-adiabaticity techniques. we compute efficiency and power for a paradigmatic harmonic quantum otto engine by taking the energetic cost of the shortcut driving explicitly into account. we demonstrate that shortcut-to... | energy efficient quantum machines |
we probe the excitation spectrum of an ultracold one-dimensional bose gas of cesium atoms with a repulsive contact interaction that we tune from the weakly to the strongly interacting regime via a magnetic feshbach resonance. the dynamical structure factor, experimentally obtained using bragg spectroscopy, is compared ... | probing the excitations of a lieb-liniger gas from weak to strong coupling |
a data-science approach to solving the ill-conditioned inverse problem for analytical continuation is proposed. the root of the problem lies in the fact that even tiny noise of imaginary-time input data has a serious impact on the inferred real-frequency spectra. by means of a modern regularization technique, we elimin... | sparse modeling approach to analytical continuation of imaginary-time quantum monte carlo data |
one of the intriguing characteristics of honeycomb lattices is the appearance of a pseudo-magnetic field as a result of mechanical deformation. in the case of graphene, the landau quantization resulting from this pseudo-magnetic field has been measured using scanning tunneling microscopy. here we show that a signature ... | tuning the pseudospin polarization of graphene by a pseudomagnetic field |
we propose to demonstrate nonreciprocal conversion between microwave and optical photons in an electro-optomechanical system where a microwave mode and an optical mode are coupled indirectly via two nondegenerate mechanical modes. the nonreciprocal conversion is obtained in the broken time-reversal symmetry regime, whe... | nonreciprocal conversion between microwave and optical photons in electro-optomechanical systems |
it was shown [new j. phys. 17, 103037 (2015), 10.1088/1367-2630/17/10/103037] that large and robust entanglement between two different mechanical resonators could be achieved, either dynamically or in the steady state, in an optomechanical system in which the two mechanical resonators are coupled to a single cavity mod... | enhanced entanglement of two different mechanical resonators via coherent feedback |
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