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quantum mechanics predicts a number of, at first sight, counterintuitive phenomena. it therefore remains a question whether our intuition is the best way to find new experiments. here, we report the development of the computer algorithm melvin which is able to find new experimental implementations for the creation and ... | automated search for new quantum experiments |
topological protected wave engineering in artificially structured media is at the frontier of ongoing metamaterials research that is inspired by quantum mechanics. acoustic analogues of electronic topological insulators have recently led to a wealth of new opportunities in manipulating sound propagation with strikingly... | topological acoustic delay line |
we establish a link between metastability and a discrete time-crystalline phase in a periodically driven open quantum system. the mechanism we highlight requires neither the system to display any microscopic symmetry nor the presence of disorder, but relies instead on the emergence of a metastable regime. we investigat... | discrete time crystals in the absence of manifest symmetries or disorder in open quantum systems |
we study a quantum heat engine at strong coupling between the system and the thermal reservoirs. exploiting a collective coordinate mapping, we incorporate system-reservoir correlations into a consistent thermodynamic analysis, thus circumventing the usual restriction to weak coupling and vanishing correlations. we app... | performance of a quantum heat engine at strong reservoir coupling |
the resilience of quantum entanglement to a classicality-inducing environment is tied to fundamental aspects of quantum many-body systems. the dynamics of entanglement has recently been studied in the context of measurement-induced entanglement transitions, where the steady-state entanglement collapses from a volume la... | measurement-induced entanglement transitions in many-body localized systems |
confinement describes the phenomenon when the attraction between two particles grows with their distance, most prominently found in quantum chromodynamics (qcd) between quarks. in condensed matter physics, confinement can appear in quantum spin chains, for example, in the one dimensional transverse field ising model (t... | confinement and entanglement dynamics on a digital quantum computer |
the quantum approximate optimization algorithm (qaoa) is a hybrid quantum-classical variational algorithm designed to tackle combinatorial optimization problems. despite its promise for near-term quantum applications, not much is currently understood about qaoa's performance beyond its lowest-depth variant. an essentia... | quantum approximate optimization algorithm: performance, mechanism, and implementation on near-term devices |
inspired by classical results in integrable boundary quantum field theory, we propose a definition of integrable initial states for quantum quenches in lattice models. they are defined as the states which are annihilated by all local conserved charges that are odd under space reflection. we show that this class include... | what is an integrable quench? |
we study stochastic energetic exchanges in quantum heat engines. due to microreversibility, these obey a fluctuation relation, called the heat engine fluctuation relation, which implies the carnot bound: no machine can have an efficiency greater than carnot’s efficiency. the stochastic thermodynamics of a quantum heat ... | nonequilibrium fluctuations in quantum heat engines: theory, example, and possible solid state experiments |
we study the nonequilibrium time evolution of a variety of one-dimensional (1d) and two-dimensional (2d) systems (including ssh model, kitaev-chain, haldane model, p +i p superconductor, etc.) following a sudden quench. we prove analytically that topology-changing quenches are always followed by nonanalytical temporal ... | topological classification of dynamical phase transitions |
we study a stochastic lattice gas of particles in one dimension with strictly finite-range interactions that respect the fractonlike conservation laws of total charge and dipole moment. as the charge density is varied, the connectivity of the system's charge configurations under the dynamics changes qualitatively. we f... | kinetically constrained freezing transition in a dipole-conserving system |
nonequilibrium properties of quantum materials present many intriguing properties, among them athermal behavior, which violates the eigenstate thermalization hypothesis. such behavior has primarily been observed in disordered systems. more recently, experimental and theoretical evidence for athermal eigenstates, known ... | exact three-colored quantum scars from geometric frustration |
we consider the critical o(n) model in the presence of an external magnetic field localized in space. this setup can potentially be realized in quantum simulators and in some liquid mixtures. the external field can be understood as a relevant perturbation of the trivial line defect, and thus triggers a defect renormali... | localized magnetic field in the o(n) model |
we propose a new diagnostic for quantum chaos. we show that the time evolution of complexity for a particular type of target state can provide equivalent information about the classical lyapunov exponent and scrambling time as out-of-time-order correlators. moreover, for systems that can be switched from a regular to u... | chaos and complexity in quantum mechanics |
symmetry breaking is a fundamental concept in understanding quantum phases of matter, studied so far mostly through the lens of local order parameters. recently, a new entanglement-based probe of symmetry breaking has been introduced under the name of \textit{entanglement asymmetry}, which has been employed to investig... | a universal formula for the entanglement asymmetry of matrix product states |
we use the spread complexity (sc) of a time-evolved state after a sudden quantum quench in the lipkin-meshkov-glick (lmg) model prepared in the ground state as a probe of the quantum phase transition when the system is quenched toward the critical point. by studying the growth of the effective number of elements of the... | time evolution of spread complexity in quenched lipkin-meshkov-glick model |
we outline a general formalism of hydrodynamics for quantum systems with multiple particle species which undergo completely elastic scattering. in the thermodynamic limit, the complete kinematic data of the problem consist of the particle content, the dispersion relations, and a universal dressing transformation which ... | ballistic transport in the one-dimensional hubbard model: the hydrodynamic approach |
we investigate the dynamics of quantum entanglement after a global quench and uncover a qualitative difference between the behavior of the von neumann entropy and higher rényi entropies. we argue that the latter generically grow sub-ballistically, as ∝√{t }, in systems with diffusive transport. we provide strong eviden... | sub-ballistic growth of rényi entropies due to diffusion |
our common understanding of the physical world deeply relies on the notion that events are ordered with respect to some time parameter, with past events serving as causes for future ones. nonetheless, it was recently found that it is possible to formulate quantum mechanics without any reference to a global time or caus... | witnessing causal nonseparability |
in certain analytically tractable quantum chaotic systems, the calculation of out-of-time-order correlation functions, entanglement entropies after a quench, and other related dynamical observables reduces to an effective theory of an "entanglement membrane" in spacetime. these tractable systems involve an average over... | entanglement membrane in chaotic many-body systems |
in every parameter-estimation experiment, the final measurement or the postprocessing incurs a cost. postselection can improve the rate of fisher information (the average information learned about an unknown parameter from a trial) to cost. we show that this improvement stems from the negativity of a particular quasipr... | quantum advantage in postselected metrology |
we present a general symmetry-based framework for obtaining many-body hamiltonians with scarred eigenstates that do not obey the eigenstate thermalization hypothesis. our models are derived from parent hamiltonians with a non-abelian (or q -deformed) symmetry, whose eigenspectra are organized as degenerate multiplets t... | from tunnels to towers: quantum scars from lie algebras and q -deformed lie algebras |
krylov complexity measures operator growth with respect to a basis, which is adapted to the heisenberg time evolution. the construction of that basis relies on the lanczos algorithm, also known as the recursion method. the mathematics of krylov complexity can be described in terms of orthogonal polynomials. we provide ... | krylov complexity and orthogonal polynomials |
radio-frequency communication systems have long used bulk- and surface-acoustic-wave devices supporting ultrasonic mechanical waves to manipulate and sense signals. these devices have greatly improved our ability to process microwaves by interfacing them to orders-of-magnitude slower and lower loss mechanical fields. i... | controlling phonons and photons at the wavelength scale: integrated photonics meets integrated phononics |
these notes give a summary of techniques used in large deviation theory to study the fluctuations of time-additive quantities, called dynamical observables, defined in the context of langevin-type equations, which model equilibrium and nonequilibrium processes driven by external forces and noise sources. these fluctuat... | introduction to dynamical large deviations of markov processes |
the coherent superposition of quantum states is an important resource for quantum information processing which distinguishes quantum dynamics and information from their classical counterparts. in this article we determine the coherence requirements to communicate quantum information in a broad setting encompassing moni... | coherence requirements for quantum communication from hybrid circuit dynamics |
generating the periodic structure of stable materials is a long-standing challenge for the material design community. this task is difficult because stable materials only exist in a low-dimensional subspace of all possible periodic arrangements of atoms: 1) the coordinates must lie in the local energy minimum defined b... | crystal diffusion variational autoencoder for periodic material generation |
early experiments with transiting circular rydberg atoms in a superconducting resonator laid the foundations of modern cavity and circuit quantum electrodynamics1, and helped explore the defining features of quantum mechanics such as entanglement. whereas ultracold atoms and superconducting circuits have since taken ra... | quantum-enabled millimetre wave to optical transduction using neutral atoms |
the radiation of electromagnetic and mechanical waves depends not only on the intrinsic properties of the emitter but also on the surrounding environment. this principle has laid the foundation for the development of lasers, quantum optics, sonar, musical instruments and other fields related to wave-matter interaction.... | revealing the missing dimension at an exceptional point |
eigenstate thermalization is widely accepted as the mechanism behind thermalization in generic isolated quantum systems. using the example of a single magnetic defect embedded in the integrable spin-1 /2 x x z chain, we show that locally perturbing an integrable system can give rise to eigenstate thermalization. unique... | eigenstate thermalization in a locally perturbed integrable system |
quantum key distribution---exchanging a random secret key relying on a quantum mechanical resource---is the core feature of secure quantum networks. entanglement-based protocols offer additional layers of security and scale favorably with quantum repeaters, but the stringent requirements set on the photon source have m... | quantum key distribution with entangled photons generated on demand by a quantum dot |
coupling a many-body system to a thermal environment typically destroys the quantum coherence of its state, leading to an effective classical dynamics at the longest time scales. we show that systems with anyonlike defects can exhibit universal late-time dynamics that is stochastic, but fundamentally nonclassical, beca... | entanglement and dynamics of diffusion-annihilation processes with majorana defects |
in the field of monitored quantum circuits, it has remained an open question whether finite-time protocols for preparing long-range entangled states lead to phases of matter that are stable to gate imperfections, that can convert projective into weak measurements. here, we show that in certain cases, long-range entangl... | nishimori's cat: stable long-range entanglement from finite-depth unitaries and weak measurements |
we numerically investigate the critical behavior of the hubbard model on the honeycomb and the π -flux lattice, which exhibits a direct transition from a dirac semimetal to an antiferromagnetically ordered mott insulator. we use projective auxiliary-field quantum monte carlo simulations and a careful finite-size scalin... | fermionic quantum criticality in honeycomb and π -flux hubbard models: finite-size scaling of renormalization-group-invariant observables from quantum monte carlo |
mitigating crosstalk errors, whether classical or quantum mechanical, is critically important for achieving high-fidelity entangling gates in multiqubit circuits. for weakly anharmonic superconducting qubits, unwanted z z interactions can be suppressed by combining qubits with opposite anharmonicity. we present experim... | suppression of unwanted z z interactions in a hybrid two-qubit system |
we study the spectral statistics of spatially extended many-body quantum systems with on-site abelian symmetries or local constraints, focusing primarily on those with conserved dipole and higher moments. in the limit of large local hilbert space dimension, we find that the spectral form factor k (t ) of floquet random... | spectral statistics in constrained many-body quantum chaotic systems |
the robust generation of quantum states in the presence of decoherence is a primary challenge for explorations of quantum mechanics at larger scales. using the mechanical motion of a single trapped ion, we utilize reservoir engineering to generate squeezed, coherent, and displaced-squeezed states as steady states in th... | quantum harmonic oscillator state synthesis by reservoir engineering |
we review recent progress in understanding nearly integrable models within the framework of generalized hydrodynamics (ghd). integrable systems have infinitely many conserved quantities and stable quasiparticle excitations: when integrability is broken, only a few residual conserved quantities survive, eventually leadi... | hydrodynamics of weak integrability breaking |
we perform classical simulations of the 127-qubit kicked ising model, which was recently emulated using a quantum circuit with error mitigation [nature 618, 500 (2023)]. our approach is based on the projected entangled pair operator (pepo) in the heisenberg picture. its main feature is the ability to automatically iden... | simulation of ibm's kicked ising experiment with projected entangled pair operator |
coupling electromagnetic waves in a cavity and mechanical vibrations via the radiation pressure of photons is a promising platform for investigations of quantum-mechanical properties of motion. a drawback is that the effect of one photon tends to be tiny, and hence one of the pressing challenges is to substantially inc... | cavity optomechanics mediated by a quantum two-level system |
directional amplifiers are an important resource in quantum-information processing, as they protect sensitive quantum systems from excess noise. here, we propose an implementation of phase-preserving and phase-sensitive directional amplifiers for microwave signals in an electromechanical setup comprising two microwave ... | quantum-limited directional amplifiers with optomechanics |
we show that the emergence of the axial anomaly is a universal phenomenon for a generic three-dimensional metal in the presence of parallel electric (e ) and magnetic (b ) fields. in contrast to the expectations of the classical theory of magnetotransport, this intrinsically quantum mechanical phenomenon gives rise to ... | axial anomaly and longitudinal magnetoresistance of a generic three-dimensional metal |
the light-matter interaction can be utilized to qualitatively alter physical properties of materials. recent theoretical and experimental studies have explored this possibility of controlling matter by light based on driving many-body systems via strong classical electromagnetic radiation, leading to a time-dependent h... | quantum electrodynamic control of matter: cavity-enhanced ferroelectric phase transition |
according to quantum mechanics, a physical system can be in any linear superposition of its possible states. although the validity of this principle is routinely validated for microscopic systems, it is still unclear why we do not observe macroscopic objects to be in superpositions of states that can be distinguished b... | schrödinger cat states of a 16-microgram mechanical oscillator |
over the past decade, two-dimensional semiconductors (2dscs) have aroused wide interest due to their extraordinary electronic, magnetic, optical, mechanical, and thermal properties, which hold potential in electronic, optoelectronic, thermoelectric applications, and so forth. the field-effect transistor (fet), a semico... | schottky barrier heights in two-dimensional field-effect transistors: from theory to experiment |
nonequilibrium dynamics of many-body quantum systems under the effect of measurement protocols is attracting an increasing amount of attention. it has been recently revealed that measurements may induce an abrupt change in the scaling law of the bipartite entanglement entropy, thus suggesting the existence of different... | growth of entanglement entropy under local projective measurements |
graphene, a single-layer network of carbon atoms, has outstanding electrical and mechanical properties1. graphene ribbons with nanometre-scale widths2,3 (nanoribbons) should exhibit half-metallicity4 and quantum confinement. magnetic edges in graphene nanoribbons5,6 have been studied extensively from a theoretical stan... | magnetic edge states and coherent manipulation of graphene nanoribbons |
motivated by the existence of exact many-body quantum scars in the affleck-kennedy-lieb-tasaki (aklt) chain, we explore the connection between matrix product state (mps) wave functions and many-body quantum scarred hamiltonians. we provide a method to systematically search for and construct parent hamiltonians with tow... | large classes of quantum scarred hamiltonians from matrix product states |
cavity optomechanical systems have been shown to exhibit an analogon to atomic electromagnetically induced transparency that a transmission window for the propagation of the probe field is induced by a strong control field when the resonance condition is met. sharp transmission features controlled by the control laser ... | fundamentals and applications of optomechanically induced transparency |
periodic driving has emerged as a powerful tool in the quest to engineer new and exotic quantum phases. while driven many-body systems are generically expected to absorb energy indefinitely and reach an infinite-temperature state, the rate of heating can be exponentially suppressed when the drive frequency is large com... | floquet prethermalization in a bose-hubbard system |
what does it mean for one quantum process to be more disordered than another? interestingly, this apparently abstract question arises naturally in a wide range of areas such as information theory, thermodynamics, quantum reference frames, and the resource theory of asymmetry. here we use a quantum-mechanical generaliza... | quantum majorization and a complete set of entropic conditions for quantum thermodynamics |
hybrid quantum systems are essential for the realization of distributed quantum networks. in particular, piezo-mechanics operating at typical superconducting qubit frequencies features low thermal excitations, and offers an appealing platform to bridge superconducting quantum processors and optical telecommunication ch... | cavity piezo-mechanics for superconducting-nanophotonic quantum interface |
for the past three decades nanoscience has widely affected many areas in physics, chemistry and engineering, and has led to numerous fundamental discoveries, as well as applications and products. concurrently, quantum science and technology has developed into a cross-disciplinary research endeavour connecting these sam... | quantum-coherent nanoscience |
we derive a computable analytical formula for the quantum fidelity between two arbitrary multimode gaussian states which is simply expressed in terms of their first- and second-order statistical moments. we also show how such a formula can be written in terms of symplectic invariants and used to derive closed forms for... | quantum fidelity for arbitrary gaussian states |
we investigate prospects of employing the linear cross entropy to experimentally access measurement-induced phase transitions without requiring any postselection of quantum trajectories. for two random circuits that are identical in the bulk but with different initial states, the linear cross entropy χ between the bulk... | cross entropy benchmark for measurement-induced phase transitions |
single-molecule junctions — devices in which a single molecule is electrically connected by two electrodes — enable the study of a broad range of quantum-transport phenomena even at room temperature. these quantum features are related to molecular orbital and spin degrees of freedom and are characterized by various ene... | single-molecule quantum-transport phenomena in break junctions |
the current understanding of the role of topology in non-hermitian (nh) systems and its far-reaching physical consequences observable in a range of dissipative settings are reviewed. in particular, how the paramount and genuinely nh concept of exceptional degeneracies, at which both eigenvalues and eigenvectors coalesc... | exceptional topology of non-hermitian systems |
electron spins and photons are complementary quantum-mechanical objects that can be used to carry, manipulate, and transform quantum information. to combine these resources, it is desirable to achieve the coherent coupling of a single spin to photons stored in a superconducting resonator. using a circuit design based o... | coherent coupling of a single spin to microwave cavity photons |
any quantum resource theory is based on free states and free operations, i.e. states and operations which can be created and performed at no cost. in the resource theory of coherence free states are diagonal in some fixed basis, and free operations are those which cannot create coherence for some particular experimenta... | genuine quantum coherence |
we present an open source computational framework geared towards the efficient numerical investigation of open quantum systems written in the julia programming language. built exclusively in julia and based on standard quantum optics notation, the toolbox offers speed comparable to low-level statically typed languages,... | quantumoptics.jl: a julia framework for simulating open quantum systems |
in a recent letter [t. dornheim et al., phys. rev. lett. 117, 156403 (2016), 10.1103/physrevlett.117.156403], we presented the first quantum monte carlo (qmc) results for the warm dense electron gas in the thermodynamic limit. however, a complete parametrization of the exchange-correlation free energy with respect to d... | ab initio exchange-correlation free energy of the uniform electron gas at warm dense matter conditions |
we provide a pedagogical review of the main ideas and results in non-equilibrium conformal field theory and connected subjects. these concern the understanding of quantum transport and its statistics at and near critical points. starting with phenomenological considerations, we explain the general framework, illustrate... | conformal field theory out of equilibrium: a review |
we investigate entanglement dynamics in continuously monitored open quantum systems featuring current-carrying nonequilibrium states. we focus on a prototypical one-dimensional model of boundary-driven noninteracting fermions with monitoring of the local density, whose average lindblad dynamics features a well-studied ... | enhanced entanglement negativity in boundary-driven monitored fermionic chains |
large-scale atomistic computer simulations of materials rely on interatomic potentials providing computationally efficient predictions of energy and newtonian forces. traditional potentials have served in this capacity for over three decades. recently, a new class of potentials has emerged, which is based on a radicall... | machine-learning interatomic potentials for materials science |
quantum squeezing in mechanical systems is not only a key signature of macroscopic quantum effects, but can also be utilized to advance the metrology of weak forces. here we show that strong mechanical squeezing in the steady state can be generated in an optomechanical system with mechanical nonlinearity and red-detune... | steady-state mechanical squeezing in an optomechanical system via duffing nonlinearity |
mechanical resonators are emerging as an important new platform for quantum science and technologies. a large number of proposals for using them to store, process and transduce quantum information motivates the development of increasingly sophisticated techniques for controlling mechanical motion in the quantum regime.... | parity measurement in the strong dispersive regime of circuit quantum acoustodynamics |
the uncontrolled interaction of a quantum system with its environment is detrimental for quantum coherence. for quantum bits in the solid state, decoherence from thermal vibrations of the surrounding lattice can typically only be suppressed by lowering the temperature of operation. here, we use a nano-electro-mechanica... | controlling the coherence of a diamond spin qubit through its strain environment |
we report on the design and implementation of a field-programmable josephson amplifier (fpja)—a compact and lossless superconducting circuit that can be programmed in situ by a set of microwave drives to perform reciprocal and nonreciprocal frequency conversion and amplification. in this work, we demonstrate four modes... | nonreciprocal microwave signal processing with a field-programmable josephson amplifier |
on a large class of lattices (such as the sawtooth chain, the kagome and the pyrochlore lattices), the quantum heisenberg and the repulsive hubbard models may host a completely dispersionless (flat) energy band in the single-particle spectrum. the flat-band states can be viewed as completely localized within a finite v... | strongly correlated flat-band systems: the route from heisenberg spins to hubbard electrons |
we introduce a family of nonintegrable 1d lattice models that feature robust periodic revivals under a global quench from certain initial product states, thus generalizing the phenomenon of many-body scarring recently observed in rydberg atom quantum simulators. our construction is based on a systematic embedding of th... | systematic construction of scarred many-body dynamics in 1d lattice models |
two-dimensional (2d) transition metal dichalcogenides (tmds) have a range of unique physics properties and could be used in the development of electronics, photonics, spintronics and quantum computing devices. the mechanical exfoliation technique of micro-size tmd flakes has attracted particular interest due to its sim... | ising superconductivity and quantum phase transition in macro-size monolayer nbse2 |
we study 2+1 dimensional gauge theories with a chern-simons term and a fermion in the adjoint representation. we apply general considerations of symmetries, anomalies, and renormalization group flows to determine the possible phases of the theory as a function of the gauge group, the chern-simons level $k$, and the fer... | phases of adjoint qcd_3 and dualities |
the interplay of interactions and strong disorder can lead to an exotic quantum many-body localized (mbl) phase. beyond the absence of transport, the mbl phase has distinctive signatures, such as slow dephasing and logarithmic entanglement growth; they commonly result in slow and subtle modification of the dynamics, ma... | direct measurement of non-local interactions in the many-body localized phase |
for classical ballistic transport in a multiterminal geometry, we derive a universal trade-off relation between total dissipation and the precision, at which particles are extracted from individual reservoirs. remarkably, this bound becomes significantly weaker in the presence of a magnetic field breaking time-reversal... | thermodynamic bounds on precision in ballistic multiterminal transport |
when two or more degrees of freedom become coupled in a physical system, a number of observables of the latter cannot be represented by mathematical expressions separable with respect to the different degrees of freedom. in recent years it appeared clear that these expressions may display the same mathematical structur... | quantum-like nonseparable structures in optical beams |
many-body localization (mbl) describes a class of systems that do not approach thermal equilibrium under their intrinsic dynamics; mbl and conventional thermalizing systems form distinct dynamical phases of matter, separated by a phase transition at which equilibrium statistical mechanics breaks down. true many-body lo... | dynamics and transport at the threshold of many-body localization |
we use the formalism of strange correlators to construct a critical classical lattice model in two dimensions with the haagerup fusion category h3 as input data. we present compelling numerical evidence in the form of finite entanglement scaling to support a haagerup conformal field theory (cft) with central charge c =... | critical lattice model for a haagerup conformal field theory |
modern quantum mechanics is a classic graduate level textbook, covering the main concepts from quantum mechanics in a clear, organized and engaging manner. the original author, j. j. sakurai, was a renowned particle theorist. this third edition, revised by jim napolitano, introduces topics that extend its value into th... | modern quantum mechanics |
the entanglement entropy of subsystems of typical eigenstates of quantum many-body hamiltonians has recently been conjectured to be a diagnostic of quantum chaos and integrability. in quantum chaotic systems it has been found to behave as in typical pure states, while in integrable systems it has been found to behave a... | volume-law entanglement entropy of typical pure quantum states |
the collective and quantum behavior of many-body systems may be harnessed to achieve fast charging of energy storage devices, which have been recently dubbed quantum batteries. in this paper, we present an extensive numerical analysis of energy flow in a quantum battery described by a disordered quantum ising chain ham... | many-body localized quantum batteries |
systems subject to a high-frequency drive can spend an exponentially long time in a prethermal regime, in which novel phases of matter with no equilibrium counterpart can be realized. because of the notorious computational challenges of quantum many-body systems, numerical investigations in this direction have remained... | classical prethermal phases of matter |
perfect crystals are rare in nature. real materials often contain crystal defects and chemical order/disorder such as grain boundaries, dislocations, interfaces, surface reconstructions and point defects. such disruption in periodicity strongly affects material properties and functionality. despite rapid development of... | deciphering chemical order/disorder and material properties at the single-atom level |
we use continuous weak measurements of a driven superconducting qubit to experimentally study the information dynamics of a quantum maxwell's demon. we show how information gained by a demon who can track single quantum trajectories of the qubit can be converted into work using quantum coherent feedback. we verify the ... | information gain and loss for a quantum maxwell's demon |
using the theory of generalized hydrodynamics (ghd), we derive exact euler-scale dynamical two-point correlation functions of conserved densities and currents in inhomogeneous, non-stationary states of many-body integrable systems with weak space-time variations. this extends previous works to inhomogeneous and non-sta... | exact large-scale correlations in integrable systems out of equilibrium |
we study the scrambling of quantum information in local random unitary circuits by focusing on the tripartite information proposed by hosur et al. we provide exact results for the averaged rényi-2 tripartite information in two cases: (i) the local gates are haar random and (ii) the local gates are dual-unitary and rand... | scrambling in random unitary circuits: exact results |
in quantum statistical mechanics, it is of fundamental interest to understand how close the bipartite entanglement entropy of eigenstates of quantum chaotic hamiltonians is to maximal. for random pure states in the hilbert space, the average entanglement entropy is known to be nearly maximal, with a deviation that is, ... | entanglement entropy of eigenstates of quantum chaotic hamiltonians |
in closed quantum systems, dynamical phase transitions are identified by the nonanalytic behavior of the return probability as a function of time. in this work, we study the nonunitary dynamics following quenches across exceptional points in a non-hermitian lattice realizable by optical resonators. dynamical quantum ph... | dynamical quantum phase transitions in non-hermitian lattices |
the superposition principle lies at the heart of many nonclassical properties of quantum mechanics. motivated by this, we introduce a rigorous resource theory framework for the quantification of superposition of a finite number of linear independent states. this theory is a generalization of resource theories of cohere... | resource theory of superposition |
out-of-time-ordered correlation functions (otocs) are presently being extensively debated as quantifiers of dynamical chaos in interacting quantum many-body systems. we argue that in quantum spin and fermionic systems, where all local operators are bounded, an otoc of local observables is bounded as well and thus its e... | weak quantum chaos |
we study the bipartite von neumann entanglement entropy and matrix elements of local operators in the eigenstates of an interacting integrable hamiltonian (the paradigmatic spin-1/2 xxz chain), and we contrast their behavior with that of quantum chaotic systems. we find that the leading term of the average (over all ei... | entanglement and matrix elements of observables in interacting integrable systems |
the eigenstate thermalization hypothesis (eth) implies a form for the matrix elements of local operators between eigenstates of the hamiltonian, expected to be valid for chaotic systems. another signal of chaos is a positive lyapunov exponent, defined on the basis of loschmidt echo or out of time order correlators. for... | eigenstate thermalization hypothesis and out of time order correlators |
monitored quantum dynamics reveal quantum state trajectories, which exhibit a rich phenomenology of entanglement structures, including a transition from a weakly monitored volume-law-entangled phase to a strongly monitored area-law phase. for one-dimensional hybrid circuits with both random unitary dynamics and intersp... | entanglement domain walls in monitored quantum circuits and the directed polymer in a random environment |
1. mechanics; 2. thermal physics; 3. electromagnetism; 4. wave optics; 5. special relativity; 6. quantum physics. | computer simulation of university physics |
magneto-optical (mo) effects, viz. magnetically induced changes in light intensity or polarization upon reflection from or transmission through a magnetic sample, were discovered over a century and a half ago. initially they played a crucially relevant role in unveiling the fundamentals of electromagnetism and quantum ... | the 2022 magneto-optics roadmap |
we construct a schwinger-keldysh effective field theory for relativistic hydrodynamics for charged matter in a thermal background using a superspace formalism. superspace allows us to efficiently impose the symmetries of the problem and to obtain a simple expression for the effective action. we show that the theory we ... | dissipative hydrodynamics in superspace |
currently, there are intense experimental efforts to realize lattice gauge theories in quantum simulators. except for specific models, however, practical quantum simulators can never be fine-tuned to perfect local gauge invariance. there is thus a strong need for a rigorous understanding of gauge-invariance violation a... | reliability of lattice gauge theories |
topological quantum memory can protect information against local errors up to finite error thresholds. such thresholds are usually determined based on the success of decoding algorithms rather than the intrinsic properties of the mixed states describing corrupted memories. here we provide an intrinsic characterization ... | diagnostics of mixed-state topological order and breakdown of quantum memory |
all physical systems are to some extent open and interacting with their environment. this insight, basic as it may seem, gives rise to the necessity of protecting quantum systems from decoherence in quantum technologies and is at the heart of the emergence of classical properties in quantum physics. the precise decoher... | observation of non-markovian micromechanical brownian motion |
we study the symmetry resolved entanglement entropies in gapped integrable lattice models. we use the corner transfer matrix to investigate two prototypical gapped systems with a u(1) symmetry: the complex harmonic chain and the xxz spin-chain. while the former is a free bosonic system, the latter is genuinely interact... | symmetry resolved entanglement in gapped integrable systems: a corner transfer matrix approach |
spectral correlations are a powerful tool to study the dynamics of quantum many-body systems. for hermitian hamiltonians, quantum chaotic motion is related to random matrix theory spectral correlations. based on recent progress in the application of spectral analysis to non-hermitian quantum systems, we show that local... | symmetry classification and universality in non-hermitian many-body quantum chaos by the sachdev-ye-kitaev model |
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