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we study many-body quantum dynamics using floquet quantum circuits in one space dimension as simple examples of systems with local interactions that support ergodic phases. physical properties can be expressed in terms of multiple sums over feynman histories, which for these models are paths or many-body orbits in fock... | local pairing of feynman histories in many-body floquet models |
many-body localization (mbl) has emerged as a novel paradigm for robust ergodicity breaking in closed quantum many-body systems. however, it is not yet clear to which extent mbl survives in the presence of dissipative processes induced by the coupling to an environment. here we study heating and ergodicity for a paradi... | robustness of many-body localization in the presence of dissipation |
we demonstrate the possibility of optical nonreciprocal response in a three-mode optomechanical system where one mechanical mode is optomechanically coupled to two linearly coupled optical modes simultaneously. the optical nonreciprocal behavior is induced by the phase difference between the two optomechanical coupling... | optical nonreciprocity and optomechanical circulator in three-mode optomechanical systems |
quantum mechanics allows distribution of intrinsically secure encryption keys by optical means. twin-field quantum key distribution is one of the most promising techniques for its implementation on long-distance fiber networks, but requires stabilizing the optical length of the communication channels between parties. i... | coherent phase transfer for real-world twin-field quantum key distribution |
out-of-time-order correlation (otoc) functions provide a powerful theoretical tool for diagnosing chaos and the scrambling of information in strongly interacting, quantum systems. however, their direct and unambiguous experimental measurement remains an essential challenge. at its core, this challenge arises from the f... | disentangling scrambling and decoherence via quantum teleportation |
the deconfined quantum critical point (dqcp) -- the enigmatic incarnation of the quantum phase transition beyond the landau-ginzburg-wilson paradigm of symmetries and their spontaneous breaking -- has been proposed and actively pursued for more than two decades. various 2d quantum many-body lattice models, both in spin... | the teaching from entanglement: 2d su(2) antiferromagnet to valence bond solid deconfined quantum critical points are not conformal |
we propose an improved scheme to do the time-dependent variational principle (tdvp) in finite matrix product states (mpss) for two-dimensional systems or one-dimensional systems with long-range interactions. we present a method to represent the time-evolving state in a mps with its basis enriched by state averaging wit... | time-dependent variational principle with ancillary krylov subspace |
we revisit the so-called folded xxz model, which was treated earlier by two independent research groups. we argue that this spin-1/2 chain is one of the simplest quantum integrable models, yet it has quite remarkable physical properties. the particles have constant scattering lengths, which leads to a simple treatment ... | integrable spin chain with hilbert space fragmentation and solvable real-time dynamics |
the landauer principle states that any logically irreversible information processing must be accompanied by dissipation into the environment. in this letter, we investigate the heat dissipation associated with finite-time information erasure and the effect of quantum coherence in such processes. by considering a scenar... | finite-time quantum landauer principle and quantum coherence |
we compute the witten index of one-dimensional gauged linear sigma models with at least = 2 supersymmetry. in the phase where the gauge group is broken to a finite group, the index is expressed as a certain residue integral. it is subject to a change as the fayet-iliopoulos parameter is varied through the phase boundar... | witten index and wall crossing |
this letter introduces a new class of robust states known as exceptional bound (eb) states, which are distinct from the well-known topological and non-hermitian skin boundary states. eb states occur in the presence of exceptional points, which are non-hermitian critical points where eigenstates coalesce and fail to spa... | exceptional bound states and negative entanglement entropy |
we consider the quantum quench in the xx spin chain starting from a tilted néel state which explicitly breaks the u(1)u(1) symmetry of the post-quench hamiltonian. very surprisingly, the u(1)u(1) symmetry is not restored at large time because of the activation of a non-abelian set of charges which all break it. the bre... | lack of symmetry restoration after a quantum quench: an entanglement asymmetry study |
we propose a thermodynamic refrigeration cycle which uses indefinite causal orders to achieve nonclassical cooling. the cycle cools a cold reservoir while consuming purity in a control qubit. we first show that the application to an input state of two identical thermalizing channels of temperature t in an indefinite ca... | quantum refrigeration with indefinite causal order |
we study d-dimensional conformal field theories (cfts) on the cylinder, , and its deformations. in d = 2 the casimir energy (i.e. the vacuum energy) is universal and is related to the central charge c. in d = 4 the vacuum energy depends on the regularization scheme and has no intrinsic value. we show that this property... | the casimir energy in curved space and its supersymmetric counterpart |
in this work, we use an extension of the quantization condition, given in ref. [1], to numerically explore the finite-volume spectrum of three relativistic particles, in the case that two-particle subsets are either resonant or bound. the original form of the relativistic three-particle quantization condition was deriv... | numerical exploration of three relativistic particles in a finite volume including two-particle resonances and bound states |
the ability to engineer nonreciprocal interactions is an essential tool in modern communication technology as well as a powerful resource for building quantum networks. aside from large reverse isolation, a nonreciprocal device suitable for applications must also have high efficiency (low insertion loss) and low output... | demonstration of efficient nonreciprocity in a microwave optomechanical circuit* |
diverse models of engines energised by quantum-coherent, hence non-thermal, baths allow the engine efficiency to transgress the standard thermodynamic carnot bound. these transgressions call for an elucidation of the underlying mechanisms. here we show that non-thermal baths may impart not only heat, but also mechanica... | on the operation of machines powered by quantum non-thermal baths |
one of the general mechanisms that give rise to the slow cooperative relaxation characteristic of classical glasses is the presence of kinetic constraints in the dynamics. here we show that dynamical constraints can similarly lead to slow thermalization and metastability in translationally invariant quantum many-body s... | quantum slow relaxation and metastability due to dynamical constraints |
higher-order topological (hot) states, hosting topologically protected modes on lower-dimensional boundaries, such as hinges and corners, have recently extended the realm of the static topological phases. here we demonstrate the possibility of realizing a two-dimensional floquet second-order topological insulator, feat... | out of equilibrium higher-order topological insulator: floquet engineering and quench dynamics |
we analyze the quantum phases, correlation functions and edge modes for a class of spin-1/2 and fermionic models related to the one-dimensional ising chain in the presence of a transverse field. these models are the ising chain with anti-ferromagnetic long-range interactions that decay with distance r as 1/{r}α , as we... | long-range ising and kitaev models: phases, correlations and edge modes |
we investigate the conditions under which periodically driven quantum systems subject to dissipation exhibit a stable subharmonic response. noting that coupling to a bath introduces not only cooling but also noise, we point out that a system subject to the latter for the entire cycle tends to lose coherence of the subh... | time crystallinity in dissipative floquet systems |
quantum entanglement and its main quantitative measures, the entanglement entropy and entanglement negativity, play a central role in many-body physics. an interesting twist arises when the system considered has symmetries leading to conserved quantities: recent studies introduced a way to define, represent in field th... | dynamics of charge-resolved entanglement after a local quench |
majorana bosons, that is, tight bosonic analogs of the majorana fermionic quasiparticles of condensed-matter physics, are forbidden for gapped free bosonic matter within a standard hamiltonian scenario. we show how the interplay between dynamical metastability and nontrivial bulk topology makes their emergence possible... | topology by dissipation: majorana bosons in metastable quadratic markovian dynamics |
bell's theorem rules out many potential reformulations of quantum mechanics, but within a generalized framework it does not exclude all locally mediated models. such models describe the correlations between entangled particles as mediated by intermediate parameters that track the particle worldlines and respect lorentz... | colloquium: bell's theorem and locally mediated reformulations of quantum mechanics |
using numerical exact diagonalization, we study matrix elements of a local spin operator in the eigenbasis of two different nonintegrable quantum spin chains. our emphasis is on the question to what extent local operators can be represented as random matrices and, in particular, to what extent matrix elements can be co... | eigenstate thermalization hypothesis beyond standard indicators: emergence of random-matrix behavior at small frequencies |
the laws of thermodynamics, despite their wide range of applicability, are known to break down when systems are correlated with their environments. here we generalize thermodynamics to physical scenarios which allow presence of correlations, including those where strong correlations are present. we exploit the connecti... | generalized laws of thermodynamics in the presence of correlations |
random quantum circuits are proficient information scramblers and efficient generators of randomness, rapidly approximating moments of the unitary group. we study the convergence of local random quantum circuits to unitary $k$-designs. employing a statistical mechanical mapping, we give an exact expression of the dista... | unitary designs from statistical mechanics in random quantum circuits |
top quarks represent unique high-energy systems since their spin correlations can be measured, thus allowing to study fundamental aspects of quantum mechanics with qubits at high-energy colliders. we present here the general framework of the quantum state of a top-antitop (tt¯) quark pair produced through quantum chrom... | quantum information with top quarks in qcd |
some measurements in quantum mechanics disturb each other. this has puzzled physicists since the formulation of the theory, but only in recent decades has the incompatibility of measurements been analyzed in depth and detail, using the notion of joint measurability of generalized measurements. in this colloquium joint ... | colloquium: incompatible measurements in quantum information science |
we study the level-spacing statistics in the entanglement spectrum of output states of random universal quantum circuits where qubits are subject to a finite probability of projection to the computational basis at each time step. we encounter two phase transitions with increasing projection rate. the first is the volum... | nonuniversal entanglement level statistics in projection-driven quantum circuits |
gauge theories are of paramount importance in our understanding of fundamental constituents of matter and their interactions. however, the complete characterization of their phase diagrams and the full understanding of non-perturbative effects are still debated, especially at finite charge density, mostly due to the si... | lattice quantum electrodynamics in (3+1)-dimensions at finite density with tensor networks |
we study bounds on ratios of fluctuations in steady-state time-reversal energy conversion devices. in the linear response regime, we prove that the relative fluctuations (precision) of the output current (power) is always lower bounded by the relative fluctuations of the input current (heat current absorbed from the ho... | universal bounds on fluctuations in continuous thermal machines |
we identify a universal indicator for the impact of coherence on periodically driven quantum devices by dividing their power output into a classical contribution and one stemming solely from superpositions. specializing to lindblad dynamics and small driving amplitudes, we derive general upper bounds on both the cohere... | universal coherence-induced power losses of quantum heat engines in linear response |
we identify a phase transition between two kinds of volume-law entangled phases in non-local but few-body unitary dynamics with local projective measurements. in one phase, a finite fraction of the system belongs to a fully-entangled state, one for which no subsystem is in a pure state, while in the second phase, the s... | measurement-driven phase transition within a volume-law entangled phase |
we present a novel generic framework to approximate the nonequilibrium steady states of dissipative quantum many-body systems. it is based on the variational minimization of a suitable norm of the quantum master equation describing the dynamics. we show how to apply this approach to different classes of variational qua... | variational principle for steady states of dissipative quantum many-body systems |
we investigate how entanglement spreads in time-dependent states of a 1+1 dimensional conformal field theory (cft). the results depend qualitatively on the value of the central charge. in rational cfts, which have central charge below a critical value, entanglement entropy behaves as if correlations were carried by fre... | entanglement scrambling in 2d conformal field theory |
we demonstrate the universal properties of dissipative tomonaga-luttinger (tl) liquids by calculating correlation functions and performing finite-size scaling analysis of a non-hermitian xxz spin chain as a prototypical model in one-dimensional open quantum many-body systems. our analytic calculation is based on effect... | universal properties of dissipative tomonaga-luttinger liquids: case study of a non-hermitian xxz spin chain |
the precise measurement of low temperatures is a challenging, important, and fundamental task for quantum science. in particular, in situ thermometry is highly desirable for cold atomic systems due to their potential for quantum simulation. here, we demonstrate that the temperature of a noninteracting fermi gas can be ... | in situ thermometry of a cold fermi gas via dephasing impurities |
we report on the calculation of the symmetry resolved entanglement entropies in two-dimensional many-body systems of free bosons and fermions by dimensional reduction. when the subsystem is translational invariant in a transverse direction, this strategy allows us to reduce the initial two-dimensional problem into deco... | symmetry resolved entanglement in two-dimensional systems via dimensional reduction |
entanglement entropy provides a powerful characterization of two-dimensional gapped topological phases of quantum matter, intimately tied to their description by topological quantum field theories (tqfts). fracton topological orders are three-dimensional gapped topologically ordered states of matter that lack a tqft de... | topological entanglement entropy of fracton stabilizer codes |
in quantum mechanics, measurements cause wavefunction collapse that yields precise outcomes, whereas for non-commuting observables such as position and momentum heisenberg’s uncertainty principle limits the intrinsic precision of a state. although theoretical work has demonstrated that it should be possible to perform ... | quantum dynamics of simultaneously measured non-commuting observables |
symmetry-protected topological (spt) phases are many-body quantum states that are topologically nontrivial as long as the relevant symmetries are unbroken. in this work we show that spt phases are also well defined for average symmetries, where quenched disorders locally break the symmetries, but restore the symmetries... | average symmetry-protected topological phases |
we study quantum many-body scars (qmbs) in the language of commutant algebras, which are defined as symmetry algebras of families of local hamiltonians. this framework explains the origin of dynamically disconnected subspaces seen in models with exact qmbs, i.e., the large "thermal" subspace and the small "non-thermal"... | exhaustive characterization of quantum many-body scars using commutant algebras |
multipole symmetries are of interest both as a window on fracton physics and as a crucial ingredient in realizing new universality classes for quantum dynamics. here we address the question of whether and when multipole symmetries can be spontaneously broken, both in thermal equilibrium and at zero temperature. we deri... | spontaneous breaking of multipole symmetries |
the quantum kibble-zurek mechanism (qkzm) predicts universal dynamical behavior near the quantum phase transitions (qpts). it is now well understood for the one-dimensional quantum matter. higher-dimensional systems, however, remain a challenge, complicated by the fundamentally different character of the associated qpt... | quantum phase transition dynamics in the two-dimensional transverse-field ising model |
we present exact results on a novel kind of emergent random matrix universality that quantum many-body systems at infinite temperature can exhibit. specifically, we consider an ensemble of pure states supported on a small subsystem, generated from projective measurements of the remainder of the system in a local basis.... | exact emergent quantum state designs from quantum chaotic dynamics |
we propose a universal, on-chip quantum transducer based on surface acoustic waves in piezoactive materials. because of the intrinsic piezoelectric (and/or magnetostrictive) properties of the material, our approach provides a universal platform capable of coherently linking a broad array of qubits, including quantum do... | universal quantum transducers based on surface acoustic waves |
in quantum systems, a subspace spanned by degenerate eigenvectors of the hamiltonian may have higher symmetries than those of the hamiltonian itself. when this enhanced-symmetry group can be generated from local operators, we call it a quasisymmetry group. when the group is a lie group, an external field coupled to cer... | quasisymmetry groups and many-body scar dynamics |
in force sensing, optomechanics, and quantum motion experiments, it is typically advantageous to create lightweight, compliant mechanical elements with the lowest possible force noise. here, we report the fabrication and characterization of high-aspect-ratio, nanogram-scale si3 n4 "trampolines" having quality factors a... | ultralow-noise sin trampoline resonators for sensing and optomechanics |
we study in detail the properties of the quantum east model, an interacting quantum spin chain inspired by simple kinetically constrained models of classical glasses. through a combination of analytics, exact diagonalization, and tensor-network methods, we show the existence of a transition, from a fast to a slow therm... | quantum east model: localization, nonthermal eigenstates, and slow dynamics |
we consider the time evolution of mixed state correlation measures in two-dimensional conformal field theories, such as logarithmic negativity, odd entropy, and reflected entropy, after quantum quenches of various kinds. these correlation measures, in the holographic context, are all associated to the entanglement wedg... | correlation measures and the entanglement wedge cross-section after quantum quenches in two-dimensional conformal field theories |
several years ago, it was proposed that the usual solutions of the yang-baxter equation associated to lie groups can be deduced in a systematic way from four-dimensional gauge theory. in the present paper, we extend this picture, fill in many details, and present the arguments in a concrete and down-to-earth way. many ... | gauge theory and integrability, i |
the uncertainty principle is a striking and fundamental feature in quantum mechanics, distinguishing it from classical mechanics. it offers an important lower bound to predict outcomes of two arbitrary incompatible observables measured on a particle. in quantum information theory, this uncertainty principle is popularl... | improved tripartite uncertainty relation with quantum memory |
although quantum mechanics applies to many macroscopic superconducting devices, one basic prediction remained controversial for decades. namely, a josephson junction connected to a resistor must undergo a dissipation-induced quantum phase transition from superconductor to insulator once the resistor's value exceeds $h/... | observation of the schmid-bulgadaev dissipative quantum phase transition |
we develop a new method for the construction of one-dimensional integrable lindblad systems, which describe quantum many body models in contact with a markovian environment. we find several new models with interesting features, such as annihilation-diffusion processes, a mixture of coherent and classical particle propa... | constructing integrable lindblad superoperators |
open quantum many-body systems play an important role in quantum optics and condensed matter physics, and capture phenomena like transport, the interplay between hamiltonian and incoherent dynamics, and topological order generated by dissipation. we introduce a versatile and practical method to numerically simulate one... | positive tensor network approach for simulating open quantum many-body systems |
the eigenstate thermalization hypothesis (eth) is a successful theory that provides sufficient criteria for ergodicity in quantum many-body systems. most studies were carried out for hamiltonians relevant for ultracold quantum gases and single-component systems of spins, fermions, or bosons. the paradigmatic example fo... | eigenstate thermalization and quantum chaos in the holstein polaron model |
we analyze the production of entropy along nonequilibrium processes in quantum systems coupled to generic environments. first, we show that the entropy production due to final measurements and the loss of correlations obeys a fluctuation theorem in detailed and integral forms. second, we discuss the decomposition of th... | quantum fluctuation theorems for arbitrary environments: adiabatic and nonadiabatic entropy production |
often quantum systems are not isolated and interactions with their environments must be taken into account. in such open quantum systems these environmental interactions can lead to decoherence and dissipation, which have a marked influence on the properties of the quantum system. in many instances the environment is w... | quantum dynamics in open quantum-classical systems |
we study a generic cavity-qed system where a set of (artificial) two-level dipoles is coupled to the electric field of a single-mode l c resonator. this setup is used to derive a minimal quantum mechanical model for cavity qed, which accounts for both dipole-field and direct dipole-dipole interactions. the model is app... | cavity quantum electrodynamics in the nonperturbative regime |
we present a general framework in which both krylov state and operator complexities can be put on the same footing. in our formalism, the krylov complexity is defined in terms of the density matrix of the associated state which, for the operator complexity, lives on a doubled hilbert space obtained through the channel-... | a universal approach to krylov state and operator complexities |
we find exponentially many exact quantum many-body scar states in a two-dimensional pxp model—an effective model for a two-dimensional rydberg atom array in the nearest-neighbor blockade regime. such scar states are remarkably simple valence bond solids despite being at an effectively infinite temperature, and thus str... | quantum many-body scar states in two-dimensional rydberg atom arrays |
expansions of physical functions are controlled by their singularities, which have special structure because they themselves are physical, corresponding to instantons, caustics or saddle configurations. resurgent asymptotics formalizes this idea mathematically, and leads to significantly more powerful extrapolation met... | physical resurgent extrapolation |
differential geometry offers a powerful framework for optimising and characterising finite-time thermodynamic processes, both classical and quantum. here, we start by a pedagogical introduction to the notion of thermodynamic length. we review and connect different frameworks where it emerges in the quantum regime: adia... | geometric optimisation of quantum thermodynamic processes |
rényi entropies are conceptually valuable and experimentally relevant generalizations of the celebrated von neumann entanglement entropy. after a quantum quench in a clean quantum many-body system they generically display a universal linear growth in time followed by saturation. while a finite subsystem is essentially ... | growth of rényi entropies in interacting integrable models and the breakdown of the quasiparticle picture |
any system of coupled oscillators may be characterized by its spectrum of resonance frequencies (or eigenfrequencies), which can be tuned by varying the system's parameters. the relationship between control parameters and the eigenfrequency spectrum is central to a range of applications1-3. however, fundamental aspects... | measuring the knot of non-hermitian degeneracies and non-commuting braids |
solar-driven hydrogen peroxide (h2o2) production presents unique merits of sustainability and environmental friendliness. herein, efficient solar-driven h2o2 production through dioxygen reduction is achieved by employing polymeric carbon nitride framework with sodium cyanaminate moiety, affording a h2o2 production rate... | mechanistic analysis of multiple processes controlling solar-driven h2o2 synthesis using engineered polymeric carbon nitride |
the excess entanglement resulting from exciting a finite number of quasiparticles above the ground state of a free integrable quantum field theory has been investigated quite extensively in the literature. it has been found that it takes a very simple form, depending only on the number of excitations and their statisti... | symmetry resolved entanglement of excited states in quantum field theory. part i. free theories, twist fields and qubits |
in his famous thought experiment, wigner assigns an entangled state to the composite quantum system made up of wigner's friend and her observed system. while the two of them have different accounts of the process, each wigner and his friend can in principle verify his/her respective state assignments by performing an a... | a no-go theorem for observer-independent facts |
we compare the accuracy of two prime time evolution algorithms involving matrix product states—tdmrg (time-dependent density matrix renormalization group) and tdvp (time-dependent variational principle). the latter is supposed to be superior within a limited and fixed auxiliary space dimension. surprisingly, we find th... | time dynamics with matrix product states: many-body localization transition of large systems revisited |
this review describes how topological order associated with the presence of emergent gauge fields can reconstruct fermi surfaces of metals, even in the absence of translational symmetry breaking. we begin with an introduction to topological order using wegner’s quantum gauge theory on the square lattice: the topologica... | topological order, emergent gauge fields, and fermi surface reconstruction |
topology in quench dynamics gives rise to intriguing dynamic topological phenomena, which are intimately connected to the topology of static hamiltonians yet challenging to probe experimentally. here we theoretically characterize and experimentally detect momentum-time skyrmions in parity-time (p t ) -symmetric non-uni... | observation of emergent momentum-time skyrmions in parity-time-symmetric non-unitary quench dynamics |
for a decade the fate of a one-dimensional gas of interacting bosons in an external trapping potential remained mysterious. we here show that whenever the underlying integrability of the gas is broken by the presence of the external potential, the inevitable diffusive rearrangements between the quasiparticles, quantifi... | thermalization of a trapped one-dimensional bose gas via diffusion |
we provide conceptual and mathematical foundations for near-term quantum natural language processing (qnlp), and do so in quantum computer scientist friendly terms. we opted for an expository presentation style, and provide references for supporting empirical evidence and formal statements concerning mathematical gener... | foundations for near-term quantum natural language processing |
we study the out-of-equilibrium dynamics of the quantum cellular automaton rule 54 using a time-channel approach. we exhibit a family of (non-equilibrium) product states for which we are able to describe exactly the full relaxation dynamics. we use this to prove that finite subsystems relax to a one-parameter family of... | exact relaxation to gibbs and non-equilibrium steady states in the quantum cellular automaton rule 54 |
the extension of thermodynamics into the quantum regime has received much attention in recent years. a primary objective of current research is to find thermodynamic tasks which can be enhanced by quantum mechanical effects. with this goal in mind, we explore the finite-time dynamics of absorption refrigerators compose... | coherence-assisted single-shot cooling by quantum absorption refrigerators |
the heisenberg-kitaev model is a paradigmatic model to describe the magnetism in honeycomb-lattice mott insulators with strong spin-orbit coupling, such as a2iro3 (a =na , li ) and α -rucl3 . here, we study in detail the physics of the heisenberg-kitaev model in an external magnetic field. using a combination of monte ... | honeycomb-lattice heisenberg-kitaev model in a magnetic field: spin canting, metamagnetism, and vortex crystals |
the identification of phases of matter is a challenging task, especially in quantum mechanics, where the complexity of the ground state appears to grow exponentially with the size of the system. traditionally, physicists have to identify the relevant order parameters for the classification of the different phases. we h... | identifying quantum phase transitions with adversarial neural networks |
nonstationary longtime dynamics was recently observed in a driven two-component bose-einstein condensate coupled to an optical cavity [n. dogra, m. landini, k. kroeger, l. hruby, t. donner, and t. esslinger, arxiv:1901.05974] and analyzed in mean-field theory. we solve the underlying model in the thermodynamic limit an... | dissipation induced nonstationarity in a quantum gas |
cavity-optomechanical systems realized in single-crystal diamond are poised to benefit from its extraordinary material properties, including low mechanical dissipation and a wide optical transparency window. diamond is also rich in optically active defects, such as the nitrogen-vacancy (nv) and silicon-vacancy (siv) ce... | diamond optomechanical crystals |
we theoretically study high-order-harmonic generation (hhg) from solids driven by intense laser pulses using a one-dimensional model periodic crystal. by numerically solving the time-dependent schrödinger equation directly on a real-space grid, we successfully reproduce experimentally observed unique features of solid-... | trajectory analysis of high-order-harmonic generation from periodic crystals |
we introduce quantum circuits in two and three spatial dimensions which are classically simulable, despite producing a high degree of operator entanglement. we provide a partial characterization of these "automaton" quantum circuits and use them to study operator growth, information spreading, and local charge relaxati... | anomalous subdiffusion from subsystem symmetries |
we revisit the bogoliubov theory of quantum droplets proposed by petrov [phys. rev. lett. 115, 155302 (2015), 10.1103/physrevlett.115.155302] for an ultracold bose-bose mixture, where the mean-field collapse is stabilized by the lee-huang-yang quantum fluctuations. we show that a loophole in petrov's theory, i.e., the ... | consistent theory of self-bound quantum droplets with bosonic pairing |
the classical simulation of highly-entangling quantum dynamics is conjectured to be generically hard. thus, recently discovered measurement-induced transitions between highly entangling and low-entanglement dynamics are phase transitions in classical simulability. here, we study simulability transitions beyond entangle... | dynamical magic transitions in monitored clifford+t circuits |
we explore the role of exceptional points and complex eigenvalues on the occurrence of the quantum mpemba effect. to this end, we study a two-level driven dissipative system subjected to an oscillatory electric field and dissipative coupling with the environment. we find that both exceptional points and complex eigenva... | multiple quantum mpemba effect: exceptional points and oscillations |
we consider a paradigmatic solvable model of topological order in two dimensions, kitaev's honeycomb hamiltonian, and turn it into a measurement-only dynamics consisting of stochastic measurements of two-qubit bond operators. we find an entanglement phase diagram that resembles that of the hamiltonian problem in some w... | topology, criticality, and dynamically generated qubits in a stochastic measurement-only kitaev model |
conventional hydrodynamics describes systems with few long-lived excitations. in one dimension, however, many experimentally relevant systems feature a large number of long-lived excitations even at high temperature, because they are proximate to integrable limits. such models cannot be treated using conventional hydro... | generalized hydrodynamics: a perspective |
we outline a strategy to compute deeply inelastic scattering structure functions using a hybrid quantum computer. our approach takes advantage of the representation of the fermion determinant in the qcd path integral as a quantum mechanical path integral over 0 +1 -dimensional fermionic and bosonic worldlines. the prop... | deeply inelastic scattering structure functions on a hybrid quantum computer |
recently, a hypothesis on the complexity growth of unitarily evolving operators was presented. this hypothesis states that in generic, nonintegrable many-body systems, the so-called lanczos coefficients associated with an autocorrelation function grow asymptotically linear, with a logarithmic correction in one-dimensio... | numerically probing the universal operator growth hypothesis |
monitored quantum system with measurements can undergo dynamical phase transitions in the entanglement properties of quantum trajectories conditional on measurement outcomes. these entanglement transitions are challenging to see in experiment, as they are invisible to traditional observables like expectation values (wi... | entanglement and absorbing-state transitions in interactive quantum dynamics |
we study the matrix quantum mechanics of two free hermitian n × n matrices subject to a singlet constraint in the microcanonical ensemble. this is the simplest example of a theory that at large n has a confinement/deconfinement transition. in the microcanonical ensemble, it also exhibits partial deconfinement with a ha... | the endpoint of partial deconfinement |
we study the matrix elements of few-body observables, focusing on the off-diagonal ones, in the eigenstates of the two-dimensional transverse field ising model. by resolving all symmetries, we relate the onset of quantum chaos to the structure of the matrix elements. in particular, we show that a general result of the ... | eigenstate thermalization in the two-dimensional transverse field ising model. ii. off-diagonal matrix elements of observables |
graphs have provided an expressive mathematical tool to model quantum-mechanical devices and systems. in particular, it has been recently discovered that graph theory can be used to describe and design quantum components, devices, setups and systems, based on the two-dimensional lattice of parametric nonlinear optical ... | very-large-scale integrated quantum graph photonics |
we uncover a dynamical entanglement transition in a monitored quantum system that is heralded by a local order parameter. classically, chaotic systems can be stochastically controlled onto unstable periodic orbits and exhibit controlled and uncontrolled phases as a function of the rate at which the control is applied. ... | measurement and feedback driven entanglement transition in the probabilistic control of chaos |
much of what we know about how quantum mechanics dictates chemical dynamics comes from half a century of studying controlled collisions between crossed pairs of molecular beams. perreault et al. now show that even finer detail emerges in a study of hydrogen-deuterium (hd) collisions with d2 in a single beam. the experi... | quantum control of molecular collisions at 1 kelvin |
we introduce the idea of weakly coherent collisional models, where the elements of an environment interacting with a system of interest are prepared in states that are approximately thermal but have an amount of coherence proportional to a short system-environment interaction time in a scenario akin to well-known colli... | thermodynamics of weakly coherent collisional models |
the quantum approximate optimization algorithm (qaoa) is a general-purpose algorithm for combinatorial optimization problems whose performance can only improve with the number of layers $p$. while qaoa holds promise as an algorithm that can be run on near-term quantum computers, its computational power has not been ful... | the quantum approximate optimization algorithm and the sherrington-kirkpatrick model at infinite size |
the thermodynamic and kinetic uncertainty relations indicate trade-offs between the relative fluctuation of observables and thermodynamic quantities such as dissipation and dynamical activity. although these relations have been well studied for classical systems, they remain largely unexplored in the quantum regime. in... | thermodynamics of precision in markovian open quantum dynamics |
simulating real-time evolution in theories of fundamental interactions represents one of the central challenges in contemporary theoretical physics. cold-atom platforms stand as promising candidates to realize quantum simulations of non-perturbative phenomena in gauge theories, such as vacuum decay and hadron collision... | scattering of mesons in quantum simulators |
in this paper and its sequel, we construct topologically invariant defects in two-dimensional classical lattice models and quantum spin chains. we show how defect lines commute with the transfer matrix/hamiltonian when they obey the defect commutation relations, cousins of the yang-baxter equation. these relations and ... | topological defects on the lattice: i. the ising model |
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