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in this review recent investigations are summarized of many-body quantum systems with long-range interactions, which are currently realized in rydberg atom arrays, dipolar systems, trapped-ion setups, and cold atoms in cavities. in these experimental platforms parameters can be easily changed, and control of the range ... | long-range interacting quantum systems |
the electronic properties of graphene can give rise to a range of nonlinear optical responses. one of the most desirable nonlinear optical processes is high-harmonic generation (hhg) originating from coherent electron motion induced by an intense light field. here, we report on the observation of up to ninth-order harm... | high-harmonic generation in graphene enhanced by elliptically polarized light excitation |
random measurements have been shown to induce a phase transition in an extended quantum system evolving under chaotic unitary dynamics, when the strength of measurements exceeds a threshold value. below this threshold, a steady state with a subthermal volume law entanglement emerges, which is resistant to the disentang... | self-organized error correction in random unitary circuits with measurement |
the approach to thermal equilibrium, or thermalization, in isolated quantum systems is among the most fundamental problems in statistical physics. recent theoretical studies have revealed that thermalization in isolated quantum systems has several remarkable features, which emerge from quantum entanglement and are quit... | thermalization and prethermalization in isolated quantum systems: a theoretical overview |
gauge theories are the cornerstone of our understanding of fundamental interactions among elementary particles. their properties are often probed in dynamical experiments, such as those performed at ion colliders and high-intensity laser facilities. describing the evolution of these strongly coupled systems is a formid... | lattice gauge theories and string dynamics in rydberg atom quantum simulators |
a central result in the foundations of quantum mechanics is the kochen-specker theorem. in short, it states that quantum mechanics is in conflict with classical models in which the result of a measurement does not depend on which other compatible measurements are jointly performed. here compatible measurements are thos... | kochen-specker contextuality |
random quantum circuits, in which an array of qubits is subjected to a series of randomly chosen unitary operations, have provided key insights into the dynamics of many-body quantum entanglement. recent work has shown that interleaving the unitary operations with single-qubit measurements can drive a transition betwee... | measurement-induced topological entanglement transitions in symmetric random quantum circuits |
the generalized gibbs ensemble (gge) was introduced ten years ago to describe observables in isolated integrable quantum systems after equilibration. since then, the gge has been demonstrated to be a powerful tool to predict the outcome of the relaxation dynamics of few-body observables in a variety of integrable model... | generalized gibbs ensemble in integrable lattice models |
we survey the recent progress made in understanding nonequilibrium dynamics in closed random systems. the emphasis is on the important role played by concepts from quantum information theory and on the application of systematic renormalization group methods to capture universal aspects of the dynamics. finally, we outl... | universal dynamics and renormalization in many-body-localized systems |
quantum information processing is steadily progressing from a purely academic discipline towards applications throughout science and industry. transitioning from lab-based, proof-of-concept experiments to robust, integrated realizations of quantum information processing hardware is an important step in this process. ho... | compact ion-trap quantum computing demonstrator |
quantum-enhanced measurements exploit quantum mechanical effects for increasing the sensitivity of measurements of certain physical parameters and have great potential for both fundamental science and concrete applications. most of the research has so far focused on using highly entangled states, which are, however, di... | quantum-enhanced measurements without entanglement |
the energy damping time in a mechanical resonator is critical to many precision metrology applications, such as timekeeping and force measurements. we present measurements of the phonon lifetime of a microwave-frequency, nanoscale silicon acoustic cavity incorporating a phononic bandgap acoustic shield. using pulsed la... | nano-acoustic resonator with ultralong phonon lifetime |
the description of the non-equilibrium dynamics of isolated quantum many-body systems within the framework of statistical mechanics is a fundamental open question. conventional thermodynamical ensembles fail to describe the large class of systems that exhibit nontrivial conserved quantities, and generalized ensembles h... | experimental observation of a generalized gibbs ensemble |
we introduce a class of hybrid quantum circuits, with random unitaries and projective measurements, which host long-range order in the area-law entanglement phase of the steady state. our primary example is circuits with unitaries respecting a global ising symmetry and two competing types of measurements. the phase dia... | measurement-protected quantum phases |
non-reciprocal devices, such as circulators and isolators, are indispensable components in classical and quantum information processing in integrated photonic circuits. aside from these applications, the non-reciprocal phase shift is of fundamental interest for exploring exotic topological photonics, such as the realiz... | experimental realization of optomechanically induced non-reciprocity |
heisenberg's uncertainty principle forms a fundamental element of quantum mechanics. uncertainty relations in terms of entropies were initially proposed to deal with conceptual shortcomings in the original formulation of the uncertainty principle and, hence, play an important role in quantum foundations. more recently,... | entropic uncertainty relations and their applications |
large-scale quantum networks promise to enable secure communication, distributed quantum computing, enhanced sensing and fundamental tests of quantum mechanics through the distribution of entanglement across nodes1-7. moving beyond current two-node networks8-13 requires the rate of entanglement generation between nodes... | deterministic delivery of remote entanglement on a quantum network |
determining the stability of molecules and condensed phases is the cornerstone of atomistic modelling, underpinning our understanding of chemical and materials properties and transformations. here we show that a machine learning model, based on a local description of chemical environments and bayesian statistical learn... | machine learning unifies the modeling of materials and molecules |
the reactive force-field (reaxff) interatomic potential is a powerful computational tool for exploring, developing and optimizing material properties. methods based on the principles of quantum mechanics (qm), while offering valuable theoretical guidance at the electronic level, are often too computationally intense fo... | the reaxff reactive force-field: development, applications and future directions |
we numerically study the measurement-driven quantum phase transition of haar-random quantum circuits in 1 +1 dimensions. by analyzing the tripartite mutual information we are able to make a precise estimate of the critical measurement rate pc=0.17 (1 ) . we extract estimates for the associated bulk critical exponents t... | critical properties of the measurement-induced transition in random quantum circuits |
topological superconductors can support localized majorana states at their boundaries1-5. these quasi-particle excitations obey non-abelian statistics that can be used to encode and manipulate quantum information in a topologically protected manner6,7. although signatures of majorana bound states have been observed in ... | topological superconductivity in a phase-controlled josephson junction |
advances in isolating, controlling and entangling quantum systems are transforming what was once a curious feature of quantum mechanics into a vehicle for disruptive scientific and technological progress. pursuing the vision articulated by feynman, a concerted effort across many areas of research and development is int... | standard model physics and the digital quantum revolution: thoughts about the interface |
the kardar-parisi-zhang (kpz) universality class describes the coarse-grained behavior of a wealth of classical stochastic models. surprisingly, kpz universality was recently conjectured to also describe spin transport in the one-dimensional quantum heisenberg model. we tested this conjecture by experimentally probing ... | quantum gas microscopy of kardar-parisi-zhang superdiffusion |
unitary circuits subject to repeated projective measurements can undergo an entanglement phase transition (ept) as a function of the measurement rate. this transition is generally understood in terms of a competition between the scrambling effects of unitary dynamics and the disentangling effects of measurements. we fi... | entanglement phase transitions in measurement-only dynamics |
a search is reported for near-threshold structures in the j/$\psi$j/$\psi$ invariant mass spectrum produced in proton-proton collisions at $\sqrt{s}$ = 13 tev from data collected by the cms experiment, corresponding to an integrated luminosity of 135 fb$^{-1}$. a new structure is observed with a significance above 5 st... | observation of new structure in the j/$\\psi$j/$\\psi$ mass spectrum in proton-proton collisions at $\\sqrt{s}$ = 13 tev |
we uncover a local order parameter for measurement-induced phase transitions: the average entropy of a single reference qubit initially entangled with the system. using this order parameter, we identify scalable probes of measurement-induced criticality that are immediately applicable to advanced quantum computing plat... | scalable probes of measurement-induced criticality |
we review selected advances in the theoretical understanding of complex quantum many-body systems with regard to emergent notions of quantum statistical mechanics. we cover topics such as equilibration and thermalisation in pure state statistical mechanics, the eigenstate thermalisation hypothesis, the equivalence of e... | equilibration, thermalisation, and the emergence of statistical mechanics in closed quantum systems |
we consider disordered many-body systems with periodic time-dependent hamiltonians in one spatial dimension. by studying the properties of the floquet eigenstates, we identify two distinct phases: (i) a many-body localized (mbl) phase, in which almost all eigenstates have area-law entanglement entropy, and the eigensta... | many-body localization in periodically driven systems |
we present a hypothesis for the universal properties of operators evolving under hamiltonian dynamics in many-body systems. the hypothesis states that successive lanczos coefficients in the continued fraction expansion of the green's functions grow linearly with rate α in generic systems, with an extra logarithmic corr... | a universal operator growth hypothesis |
motivated by recent experimental observations of coherent many-body revivals in a constrained rydberg atom chain, we construct a weak quasilocal deformation of the rydberg-blockaded hamiltonian, which makes the revivals virtually perfect. our analysis suggests the existence of an underlying nonintegrable hamiltonian wh... | emergent su(2) dynamics and perfect quantum many-body scars |
heat engines should ideally have large power output, operate close to carnot efficiency and show constancy, i.e., exhibit only small fluctuations in this output. for steady-state heat engines, driven by a constant temperature difference between the two heat baths, we prove that out of these three requirements only two ... | universal trade-off between power, efficiency, and constancy in steady-state heat engines |
turbulent flows are characterized by the non-linear cascades of energy and other inviscid invariants across a huge range of scales, from where they are injected to where they are dissipated. recently, new experimental, numerical and theoretical works have revealed that many turbulent configurations deviate from the ide... | cascades and transitions in turbulent flows |
experimental advances have allowed for the exploration of nearly isolated quantum many-body systems whose coupling to an external bath is very weak. a particularly interesting class of such systems is those that do not thermalize under their own isolated quantum dynamics. in this review, we highlight the possibility fo... | discrete time crystals |
graph neural networks have recently achieved great successes in predicting quantum mechanical properties of molecules. these models represent a molecule as a graph using only the distance between atoms (nodes). they do not, however, consider the spatial direction from one atom to another, despite directional informatio... | directional message passing for molecular graphs |
space-like separation of entangled quantum states is a central concept in fundamental investigations of quantum mechanics and in quantum communication applications. optical approaches are ubiquitous in the distribution of entanglement because entangled photons are easy to generate and transmit. however, extending this ... | optically addressable nuclear spins in a solid with a six-hour coherence time |
trapping light with noble metal nanostructures overcomes the diffraction limit and can confine light to volumes typically on the order of 30 cubic nanometers. we found that individual atomic features inside the gap of a plasmonic nanoassembly can localize light to volumes well below 1 cubic nanometer (“picocavities”), ... | single-molecule optomechanics in “picocavities” |
weakly interacting quasiparticles play a central role in the low-energy description of many phases of quantum matter. at higher energies, however, quasiparticles cease to be well defined in generic many-body systems owing to a proliferation of decay channels. in this review, we discuss the phenomenon of quantum many-bo... | quantum many-body scars: a quasiparticle perspective |
understanding how statistical ensembles arise from the out-of-equilibrium dynamics of isolated pure systems has been a fascinating question since the early days of quantum mechanics. recently, it has been proposed that the thermodynamic entropy of the long-time statistical ensemble is the stationary entanglement of a l... | entanglement and thermodynamics after a quantum quench in integrable systems |
the physics of quantum mechanics is the inspiration for, and underlies, quantum computation. as such, one expects physical intuition to be highly influential in the understanding and design of many quantum algorithms, particularly simulation of physical systems. surprisingly, this has been challenging, with current ham... | optimal hamiltonian simulation by quantum signal processing |
a recent experiment in the rydberg atom chain observed unusual oscillatory quench dynamics with a charge density wave initial state, and theoretical works identified a set of many-body "scar states" showing nonthermal behavior in the hamiltonian as potentially responsible for the atypical dynamics. in the same noninteg... | exact quantum many-body scar states in the rydberg-blockaded atom chain |
the stable operation of quantum computers will rely on error correction, in which single quantum bits of information are stored redundantly in the hilbert space of a larger system. such encoded qubits are commonly based on arrays of many physical qubits, but can also be realized using a single higher-dimensional quantu... | encoding a qubit in a trapped-ion mechanical oscillator |
quantum mechanics can help to solve complex problems in physics and chemistry, provided they can be programmed in a physical device. in adiabatic quantum computing, a system is slowly evolved from the ground state of a simple initial hamiltonian to a final hamiltonian that encodes a computational problem. the appeal of... | digitized adiabatic quantum computing with a superconducting circuit |
recent years have seen tremendous progress in the theoretical understanding of quantum systems driven dissipatively by coupling to different baths at their edges. this was possible because of concurrent advances in the models used to represent these systems, the methods employed, and the analysis of the emerging phenom... | nonequilibrium boundary-driven quantum systems: models, methods, and properties |
we present an extensive introduction to quantum collision models (cms), also known as repeated interactions schemes: a class of microscopic system-bath models for investigating open quantum systems dynamics whose use is currently spreading in a number of research areas. through dedicated sections and a pedagogical appr... | quantum collision models: open system dynamics from repeated interactions |
gauge theories form the foundation of modern physics, with applications ranging from elementary particle physics and early-universe cosmology to condensed matter systems. we perform quantum simulations of the unitary dynamics of a u(1) symmetric gauge field theory and demonstrate emergent irreversible behavior. the hig... | thermalization dynamics of a gauge theory on a quantum simulator |
we propose a method for detecting bipartite entanglement in a many-body mixed state based on estimating moments of the partially transposed density matrix. the estimates are obtained by performing local random measurements on the state, followed by postprocessing using the classical shadows framework. our method can be... | mixed-state entanglement from local randomized measurements |
the scrambling of quantum information in closed many-body systems, as measured by out-of-time-ordered correlation functions (otocs), has received considerable attention lately. recently, a hydrodynamical description of otocs has emerged from considering random local circuits. numerical work suggests that aspects of thi... | diffusive hydrodynamics of out-of-time-ordered correlators with charge conservation |
this work explores a fundamental dynamical structure for a wide range of many-body quantum systems under periodic driving. generically, in the thermodynamic limit, such systems are known to heat up to infinite temperature states in the long-time limit irrespective of dynamical details, which kills all the specific prop... | floquet-magnus theory and generic transient dynamics in periodically driven many-body quantum systems |
we study the entanglement entropy of the quantum trajectories of a free fermion chain under continuous monitoring of local occupation numbers. we propose a simple theory for entanglement entropy evolution from disentangled and highly excited initial states. it is based on generalized hydrodynamics and the quasi-particl... | entanglement in a fermion chain under continuous monitoring |
synthetic magnetism has been used to control charge neutral excitations for applications ranging from classical beam steering to quantum simulation. in optomechanics, radiation-pressure-induced parametric coupling between optical (photon) and mechanical (phonon) excitations may be used to break time-reversal symmetry, ... | generalized non-reciprocity in an optomechanical circuit via synthetic magnetism and reservoir engineering |
prethermalization refers to the transient phenomenon where a system thermalizes according to a hamiltonian that is not the generator of its evolution. we provide here a rigorous framework for quantum spin systems where prethermalization is exhibited for very long times. first, we consider quantum spin systems under per... | a rigorous theory of many-body prethermalization for periodically driven and closed quantum systems |
the idea of the out-of-time-order correlator (otoc) has recently emerged in the study of both condensed matter systems and gravitational systems. it not only plays a key role in investigating the holographic duality between a strongly interacting quantum system and a gravitational system, it also diagnoses the chaotic ... | measuring out-of-time-order correlators on a nuclear magnetic resonance quantum simulator |
quantum entanglement of mechanical systems emerges when distinct objects move with such a high degree of correlation that they can no longer be described separately. although quantum mechanics presumably applies to objects of all sizes, directly observing entanglement becomes challenging as masses increase, requiring m... | direct observation of deterministic macroscopic entanglement |
state-of-the-art machine learning techniques promise to become a powerful tool in statistical mechanics via their capacity to distinguish different phases of matter in an automated way. here we demonstrate that convolutional neural networks (cnn) can be optimized for quantum many-fermion systems such that they correctl... | machine learning quantum phases of matter beyond the fermion sign problem |
progress in the discovery of new materials has been accelerated by the development of reliable quantum-mechanical approaches to crystal structure prediction. the properties of a material depend very sensitively on its structure; therefore, structure prediction is the key to computational materials discovery. structure ... | structure prediction drives materials discovery |
the physics related to the form factors of the energy-momentum tensor spans a wide spectrum of problems, and includes gravitational physics, hard-exclusive reactions, hadronic decays of heavy quarkonia, and the physics of exotic hadrons described as hadroquarkonia. it also provides access to the “last global unknown pr... | forces inside hadrons: pressure, surface tension, mechanical radius, and all that |
a central question of quantum computing is determining the source of the advantage of quantum computation over classical computation. even though simulating quantum dynamics on a classical computer is thought to require exponential overhead in the worst case, efficient simulations are known to exist in several special ... | efficient classical simulation of random shallow 2d quantum circuits |
we study generalized symmetries of quantum field theories in 1+1d generated by topological defect lines with no inverse. this paper follows our companion paper on gapped phases and anomalies associated with these symmetries. in the present work we focus on identifying fusion category symmetries, using both specialized ... | fusion category symmetry ii: categoriosities at c = 1 and beyond |
the science and technology related to semiconductors have received significant attention for applications in various fields including microelectronics, nanophotonics, and biotechnologies. understanding of semiconductors has advanced to such a level that we are now able to design novel system complexes before we go for ... | spectroscopy of semiconductors: numerical analysis bridging quantum mechanics and experiments |
this book introduces the emerging field of quantum thermodynamics, with a focus on its relation to quantum information and its implications for quantum computers and next generation quantum technologies. aimed at graduate level physics students with a working knowledge of quantum mechanics and statistical physics this ... | quantum thermodynamics; an introduction to the thermodynamics of quantum information |
we define and calculate versions of complexity for free fermionic quantum field theories in 1 +1 and 3 +1 dimensions, adopting nielsen's geodesic perspective in the space of circuits. we do this both by discretizing and identifying appropriate classes of bogoliubov-valatin transformations, and also directly in the cont... | circuit complexity in fermionic field theory |
one of the hallmarks of quantum physics is the generation of non-classical quantum states and superpositions, which has been demonstrated in several quantum systems, including ions, solid-state qubits and photons. however, only indirect demonstrations of non-classical states have been achieved in mechanical systems, de... | quantum control of surface acoustic-wave phonons |
topologically gapless edge states, characterized by topological invariants and berry's phases of bulk energy bands, provide amazing techniques to robustly control the reflectionless propagation of electrons, photons, and phonons. recently, a new family of topological phases, dictated by the bulk polarization, has been ... | elastic higher-order topological insulator with topologically protected corner states |
the competition between scrambling unitary evolution and projective measurements leads to a phase transition in the dynamics of quantum entanglement. here, we demonstrate that the nature of this transition is fundamentally altered by the presence of long-range, power-law interactions. for sufficiently weak power laws, ... | measurement-induced transition in long-range interacting quantum circuits |
the quantum computation of electronic energies can break the curse of dimensionality that plagues many-particle quantum mechanics. it is for this reason that a universal quantum computer has the potential to fundamentally change computational chemistry and materials science, areas in which strong electron correlations ... | quantum computing enhanced computational catalysis |
the idea of breaking time-translation symmetry has fascinated humanity at least since ancient proposals of the perpetuum mobile. unlike the breaking of other symmetries, such as spatial translation in a crystal or spin rotation in a magnet, time translation symmetry breaking (ttsb) has been tantalisingly elusive. we re... | a brief history of time crystals |
we experimentally study the effects of coupling one-dimensional many-body localized systems with identical disorder. using a gas of ultracold fermions in an optical lattice, we artificially prepare an initial charge density wave in an array of 1d tubes with quasirandom on-site disorder and monitor the subsequent dynami... | coupling identical one-dimensional many-body localized systems |
random numbers are a fundamental resource in science and engineering with important applications in simulation and cryptography. the inherent randomness at the core of quantum mechanics makes quantum systems a perfect source of entropy. quantum random number generation is one of the most mature quantum technologies wit... | quantum random number generators |
certain models with rank-3 tensor degrees of freedom have been shown by gurau and collaborators to possess a novel large n limit, where g2n3 is held fixed. in this limit the perturbative expansion in the quartic coupling constant, g , is dominated by a special class of "melon" diagrams. we study "uncolored" models of t... | uncolored random tensors, melon diagrams, and the sachdev-ye-kitaev models |
we develop a geometric approach to operator growth and krylov complexity in many-body quantum systems governed by symmetries. we start by showing a direct link between a unitary evolution with the liouvillian and the displacement operator of appropriate generalized coherent states. this connection maps operator growth ... | geometry of krylov complexity |
extending the framework of statistical physics to the nonequilibrium setting has led to the discovery of previously unidentified phases of matter, often catalyzed by periodic driving. however, preventing the runaway heating that is associated with driving a strongly interacting quantum system remains a challenge in the... | observation of a prethermal discrete time crystal |
nonradiating sources of energy have traditionally been studied in quantum mechanics and astrophysics but have received very little attention in the photonics community. this situation has changed recently due to a number of pioneering theoretical studies and remarkable experimental demonstrations of the exotic states o... | nonradiating photonics with resonant dielectric nanostructures |
spectral statistics of disordered systems encode thouless and heisenberg timescales, whose ratio determines whether the system is chaotic or localized. we show that the scaling of the thouless time with the system size and disorder strength is very similar in one-body anderson models and in disordered quantum many-body... | thouless time analysis of anderson and many-body localization transitions |
we study the spin-1 x y model on a hypercubic lattice in d dimensions and show that this well-known nonintegrable model hosts an extensive set of anomalous finite-energy-density eigenstates with remarkable properties. namely, they exhibit subextensive entanglement entropy and spatiotemporal long-range order, both belie... | weak ergodicity breaking and quantum many-body scars in spin-1 x y magnets |
metallic structures with nanogap features have proven highly effective as building blocks for plasmonic systems, as they can provide a wide tuning range of operating frequencies and large near-field enhancements. recent work has shown that quantum mechanical effects such as electron tunnelling and nonlocal screening be... | quantum mechanical effects in plasmonic structures with subnanometre gaps |
we solve a minimal model for an ergodic phase in a spatially extended quantum many-body system. the model consists of a chain of sites with nearest-neighbor coupling under floquet time evolution. quantum states at each site span a q -dimensional hilbert space, and time evolution for a pair of sites is generated by a q2... | solution of a minimal model for many-body quantum chaos |
in integrable many-particle systems, it is widely believed that the stationary state reached at late times after a quantum quench can be described by a generalized gibbs ensemble (gge) constructed from their extensive number of conserved charges. a crucial issue is then to identify a complete set of these charges, enab... | complete generalized gibbs ensembles in an interacting theory |
quantum cryptography exploits principles of quantum physics for the secure processing of information. a prominent example is secure communication, i.e., the task of transmitting confidential messages from one location to another. the cryptographic requirement here is that the transmitted messages remain inaccessible to... | security in quantum cryptography |
artificial neural networks and machine learning have now reached a new era after several decades of improvement where applications are to explode in many fields of science, industry, and technology. here, we use artificial neural networks to study an intriguing phenomenon in quantum physics—the topological phases of ma... | machine learning topological states |
quantum decoherence plays a pivotal role in the dynamical description of the quantum-to-classical transition and is the main impediment to the realization of devices for quantum information processing. this paper gives an overview of the theory and experimental observation of the decoherence mechanism. we introduce the... | quantum decoherence |
the assumption that quantum systems relax to a stationary state in the long-time limit underpins statistical physics and much of our intuitive understanding of scientific phenomena. for isolated systems this follows from the eigenstate thermalization hypothesis. when an environment is present the expectation is that al... | non-stationary coherent quantum many-body dynamics through dissipation |
the deconfined quantum critical point (qcp), separating the néel and valence bond solid phases in a 2d antiferromagnet, was proposed as an example of (2 +1 )d criticality fundamentally different from standard landau-ginzburg-wilson-fisher criticality. in this work, we present multiple equivalent descriptions of deconfi... | deconfined quantum critical points: symmetries and dualities |
we investigate measurement-induced phase transitions in the quantum ising chain coupled to a monitoring environment. we compare two different limits of the measurement problem: the stochastic quantum-state diffusion protocol corresponding to infinite small jumps per unit of time and the no-click limit, corresponding to... | measurement-induced entanglement transitions in the quantum ising chain: from infinite to zero clicks |
when a quantum system initialized in a product state is subjected to either coherent or incoherent dynamics, the entropy of any of its connected partitions generically increases as a function of time, signalling the inevitable spreading of (quantum) information throughout the system. here, we show that, in the presence... | symmetry-resolved dynamical purification in synthetic quantum matter |
many-body localization is shown to suppress the imaginary parts of complex eigenenergies for general non-hermitian hamiltonians having time-reversal symmetry. we demonstrate that a real-complex transition, which we conjecture occurs upon many-body localization, profoundly affects the dynamical stability of non-hermitia... | non-hermitian many-body localization |
the emergence of a special type of fluidlike behavior at large scales in one-dimensional (1d) quantum integrable systems, theoretically predicted in o. a. castro-alvaredo et al., emergent hydrodynamics in integrable quantum systems out of equilibrium, phys. rev. x 6, 041065 (2016), 10.1103/physrevx.6.041065 and b. bert... | generalized hydrodynamics on an atom chip |
we explore the high-temperature dynamics of the disordered, one-dimensional x x z model near the many-body localization (mbl) transition, focusing on the delocalized (i.e., "metallic") phase. in the vicinity of the transition, we find that this phase has the following properties: (i) local magnetization fluctuations re... | anomalous diffusion and griffiths effects near the many-body localization transition |
based on the theory of quantum mechanics, intrinsic randomness in measurement distinguishes quantum effects from classical ones. from the perspective of states, this quantum feature can be summarized as coherence or superposition in a specific (classical) computational basis. recently, by regarding coherence as a physi... | intrinsic randomness as a measure of quantum coherence |
mechanical objects have important practical applications in the fields of quantum information and metrology as quantum memories or transducers for measuring and connecting different types of quantum systems. the field of electromechanics is in pursuit of a robust and highly coherent device that couples motion to nonlin... | quantum acoustics with superconducting qubits |
interfacing a single photon with another quantum system is a key capability in modern quantum information science. it allows quantum states of matter, such as spin states of atoms, atomic ensembles or solids, to be prepared and manipulated by photon counting and, in particular, to be distributed over long distances. su... | non-classical correlations between single photons and phonons from a mechanical oscillator |
quantum theory provides an extensive framework for the description of the equilibrium properties of quantum matter. yet experiments in quantum simulators have now opened up a route towards the generation of quantum states beyond this equilibrium paradigm. while these states promise to show properties not constrained by... | dynamical quantum phase transitions: a review |
we study many-body localized quantum systems subject to periodic driving. we find that the presence of a mobility edge anywhere in the spectrum is enough to lead to delocalization for any driving strength and frequency. by contrast, for a fully localized many-body system, a delocalization transition occurs at a finite ... | fate of many-body localization under periodic driving |
measurement has a special role in quantum theory1: by collapsing the wavefunction, it can enable phenomena such as teleportation2 and thereby alter the `arrow of time' that constrains unitary evolution. when integrated in many-body dynamics, measurements can lead to emergent patterns of quantum information in space-tim... | measurement-induced entanglement and teleportation on a noisy quantum processor |
this review is devoted to the problem of thermalization in a small isolated conglomerate of interacting constituents. a variety of physically important systems of intensive current interest belong to this category: complex atoms, molecules (including biological molecules), nuclei, small devices of condensed matter and ... | quantum chaos and thermalization in isolated systems of interacting particles |
optomechanics is concerned with the use of light to control mechanical objects. as a field, it has been hugely successful in the production of precise and novel sensors, the development of low-dissipation nanomechanical devices, and the manipulation of quantum signals. micro- and nano-particles levitated in optical fie... | optomechanics with levitated particles |
we propose a measure of quantum state complexity defined by minimizing the spread of the wave function over all choices of basis. our measure is controlled by the "survival amplitude" for a state to remain unchanged, and can be efficiently computed in theories with discrete spectra. for continuous hamiltonian evolution... | quantum chaos and the complexity of spread of states |
conversion between signals in the microwave and optical domains is of great interest both for classical telecommunication and for connecting future superconducting quantum computers into a global quantum network. for quantum applications, the conversion has to be efficient, as well as operate in a regime of minimal add... | microwave-to-optics conversion using a mechanical oscillator in its quantum ground state |
the quantum approximate optimization algorithm (qaoa) is a leading candidate algorithm for solving optimization problems on quantum computers. however, the potential of qaoa to tackle classically intractable problems remains unclear. in this paper, we perform an extensive numerical investigation of qaoa on the low auto... | evidence of scaling advantage for the quantum approximate optimization algorithm on a classically intractable problem |
within the unified framework of exploiting the relative entropy as a distance measure of quantum correlations, we make explicit the hierarchical structure of quantum coherence, quantum discord, and quantum entanglement in multipartite systems. on this basis, we define a basis-independent measure of quantum coherence an... | quantum coherence in multipartite systems |
light-by-light scattering (γγ --> γγ) is a quantum-mechanical process that is forbidden in the classical theory of electrodynamics. this reaction is accessible at the large hadron collider thanks to the large electromagnetic field strengths generated by ultra-relativistic colliding lead ions. using 480 μb-1 of lead-... | evidence for light-by-light scattering in heavy-ion collisions with the atlas detector at the lhc |
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