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it has recently been discovered that random quantum circuits provide an avenue to realize rich entanglement phase diagrams, which are hidden to standard expectation values of operators. here we study (2 +1 )d random circuits with random clifford unitary gates and measurements designed to stabilize trivial area law and ... | topological order and criticality in (2 +1 )d monitored random quantum circuits |
recent experimental developments in diverse areas—ranging from cold atomic gases to light-driven semiconductors to microcavity arrays—move systems into the focus which are located on the interface of quantum optics, many-body physics and statistical mechanics. they share in common that coherent and driven-dissipative q... | keldysh field theory for driven open quantum systems |
discrete time crystals are a recently proposed and experimentally observed out-of-equilibrium dynamical phase of floquet systems, where the stroboscopic dynamics of a local observable repeats itself at an integer multiple of the driving period. we address this issue in a driven-dissipative setup, focusing on the modula... | discrete time-crystalline order in cavity and circuit qed systems |
the quantum mechanical (berry) phase of the electronic wavefunction plays a critical role in the anomalous and spin hall effects, including their quantized limits. while progress has been made in understanding these effects in ferromagnets, less is known in antiferromagnetic systems. here we present a study of antiferr... | large anomalous hall effect in a half-heusler antiferromagnet |
maxwell's demon plays a central role in thermodynamics of quantum information, yet a full experimental characterization is still missing in the quantum regime. here we use superconducting circuits to realize a quantum maxwell demon in which all thermodynamic quantities can be controlled and measured. using power detect... | observing a quantum maxwell demon at work |
the spreading of entanglement in out-of-equilibrium quantum systems is currently at the center of intense interdisciplinary research efforts involving communities with interests ranging from holography to quantum information. here we provide a constructive and mathematically rigorous method to compute the entanglement ... | entanglement spreading in a minimal model of maximal many-body quantum chaos |
equilibrium thermodynamics is characterized by two fundamental ideas: thermalization--that systems approach a late time thermal state; and phase structure--that thermal states exhibit singular changes as various parameters characterizing the system are changed. we summarize recent progress that has established generali... | equilibration and order in quantum floquet matter |
we investigate the coherence measures induced by fidelity and trace norm, based on the coherence quantification recently proposed by baumgratz et al. [t. baumgratz, m. cramer, and m. b. plenio, phys. rev. lett. 113, 140401 (2014), 10.1103/physrevlett.113.140401]. we show that the fidelity of coherence does not in gener... | fidelity and trace-norm distances for quantifying coherence |
physical systems made of many interacting quantum particles can often be described by euler hydrodynamic equations in the limit of long wavelengths and low frequencies. recently such a classical hydrodynamic framework, now dubbed generalized hydrodynamics (ghd), was found for quantum integrable models in one spatial di... | quantum generalized hydrodynamics |
certain disorder-free hamiltonians can be nonergodic due to a strong fragmentation of the hilbert space into disconnected sectors. here, we characterize such systems by introducing the notion of "statistically localized integrals of motion" (sliom), whose eigenvalues label the connected components of the hilbert space.... | statistical localization: from strong fragmentation to strong edge modes |
we construct topological defects in two-dimensional classical lattice models and quantum chains. the defects satisfy local commutation relations guaranteeing that the partition function is independent of their path. these relations and their solutions are extended to allow defect lines to fuse, branch and satisfy all t... | topological defects on the lattice: dualities and degeneracies |
in the search for new functional materials, quantum mechanics is an exciting starting point. the fundamental laws that govern the behaviour of electrons have the possibility, at the other end of the scale, to predict the performance of a material for a targeted application. in some cases, this is achievable using densi... | computational predictions of energy materials using density functional theory |
in real-time quantum feedback protocols, the record of a continuous measurement is used to stabilize a desired quantum state. recent years have seen successful applications of these protocols in a variety of well-isolated micro-systems, including microwave photons and superconducting qubits. however, stabilizing the qu... | measurement-based control of a mechanical oscillator at its thermal decoherence rate |
in physics, every observation is made with respect to a frame of reference. although reference frames are usually not considered as degrees of freedom, in all practical situations it is a physical system which constitutes a reference frame. can a quantum system be considered as a reference frame and, if so, which descr... | quantum mechanics and the covariance of physical laws in quantum reference frames |
we re-examine attempts to study the many-body localization transition using measures that are physically natural on the ergodic/quantum chaotic regime of the phase diagram. using simple scaling arguments and an analysis of various models for which rigorous results are available, we find that these measures can be parti... | distinguishing localization from chaos: challenges in finite-size systems |
this is a preliminary version of a book in progress on the theory of quantum communication. we adopt an information-theoretic perspective throughout and give a comprehensive account of fundamental results in quantum communication theory from the past decade (and earlier), with an emphasis on the modern one-shot-to-asym... | principles of quantum communication theory: a modern approach |
quantum and classical physics can be used for mathematical computations that are hard to tackle by conventional electronics. very recently, optical ising machines have been demonstrated for computing the minima of spin hamiltonians, paving the way to new ultrafast hardware for machine learning. however, the proposed sy... | large-scale photonic ising machine by spatial light modulation |
similarly to the system hamiltonian, a subsystem's reduced density matrix is composed of blocks characterized by symmetry quantum numbers (charge sectors). we present a geometric approach for extracting the contribution of individual charge sectors to the subsystem's entanglement measures within the replica trick metho... | symmetry-resolved entanglement in many-body systems |
quantum systems can be characterized by their correlations. higher-order (larger than second order) correlations, and the ways in which they can be decomposed into correlations of lower order, provide important information about the system, its structure, its interactions and its complexity. the measurement of such cor... | experimental characterization of a quantum many-body system via higher-order correlations |
this is a tutorial-style introduction to the field of molecular polaritons. we describe the basic physical principles and consequences of strong light-matter coupling common to molecular ensembles embedded in uv-visible or infrared cavities. using a microscopic quantum electrodynamics formulation, we discuss the compet... | molecular polaritons for controlling chemistry with quantum optics |
we consider the speed limit for classical stochastic markov processes with and without the local detailed balance condition. we find that, for both cases, a trade-off inequality exists between the speed of the state transformation and the entropy production. the dynamical activity is related to a time scale and plays a... | speed limit for classical stochastic processes |
the spontaneous breaking of time-translation symmetry in periodically driven quantum systems leads to a new phase of matter: the discrete time crystal (dtc). this phase exhibits collective subharmonic oscillations that depend upon an interplay of non-equilibrium driving, many-body interactions and the breakdown of ergo... | classical discrete time crystals |
it is highly nontrivial to what extent we can deduce the relaxation behavior of a quantum dissipative system from the spectral gap of the liouvillian that governs the time evolution of the density matrix. we investigate the relaxation processes of a quantum dissipative system that exhibits the liouvillian skin effect, ... | liouvillian skin effect: slowing down of relaxation processes without gap closing |
we study spectral statistics in spatially extended chaotic quantum many-body systems, using simple lattice floquet models without time-reversal symmetry. computing the spectral form factor k (t ) analytically and numerically, we show that it follows random matrix theory (rmt) at times longer than a many-body thouless t... | spectral statistics in spatially extended chaotic quantum many-body systems |
in a groundbreaking experimental advance it was recently shown that by stacking two sheets of graphene atop of each other at a twist angle close to one of the so called "magic angles", an effective two-dimensional correlated system emerges. in this system the kinetic energy of the low-energy electrons is much reduced a... | multiflat bands and strong correlations in twisted bilayer boron nitride: doping-induced correlated insulator and superconductor |
monitored quantum circuits can exhibit an entanglement transition as a function of the rate of measurements, stemming from the competition between scrambling unitary dynamics and disentangling projective measurements. we study how entanglement dynamics in nonunitary quantum circuits can be enriched in the presence of c... | entanglement and charge-sharpening transitions in u(1) symmetric monitored quantum circuits |
the fujitsu digital annealer is designed to solve fully connected quadratic unconstrained binary optimization (qubo) problems. it is implemented on application-specific cmos hardware and currently solves problems of up to 1024 variables. the digital annealer's algorithm is currently based on simulated annealing; howeve... | physics-inspired optimization for quadratic unconstrained problems using a digital annealer |
quantum mechanics dictates that the precision of physical measurements must always comply with certain noise constraints. in the case of interferometric displacement measurements, these restrictions impose a standard quantum limit (sql), which optimally balances the precision of a measurement with its unwanted backacti... | continuous force and displacement measurement below the standard quantum limit |
quantum fluctuations of the electromagnetic vacuum produce measurable physical effects such as casimir forces and the lamb shift. they also impose an observable limit—known as the quantum backaction limit—on the lowest temperatures that can be reached using conventional laser cooling techniques. as laser cooling experi... | sideband cooling beyond the quantum backaction limit with squeezed light |
a central goal of computational physics and chemistry is to predict material properties by using first-principles methods based on the fundamental laws of quantum mechanics. however, the high computational costs of these methods typically prevent rigorous predictions of macroscopic quantities at finite temperatures, su... | ab initio thermodynamics of liquid and solid water |
using an infinite matrix product state (imps) technique based on the time-dependent variational principle (tdvp), we study two major types of dynamical phase transitions (dpt) in the one-dimensional transverse-field ising model (tfim) with long-range power-law (∝1 /rα with r interspin distance) interactions out of equi... | dynamical phase diagram of quantum spin chains with long-range interactions |
to get the best possible results from current quantum devices error mitigation is essential. in this work we present a simple but effective error mitigation technique based on the assumption that noise in a deep quantum circuit is well described by global depolarizing error channels. by measuring the errors directly on... | simple mitigation of global depolarizing errors in quantum simulations |
motivated by dynamical experiments on cold atomic gases, we develop a quantum kinetic approach to weakly perturbed integrable models out of equilibrium. using the exact matrix elements of the underlying integrable model, we establish an analytical approach to real-time dynamics. the method addresses a broad range of ti... | nonequilibrium dynamics and weakly broken integrability |
creating optical components that allow light to propagate in only one direction—that is, that allow non-reciprocal propagation or `isolation' of light—is important for a range of applications. non-reciprocal propagation of sound can be achieved simply by using mechanical components that spin1,2. spinning also affects d... | flying couplers above spinning resonators generate irreversible refraction |
a recent rejuvenation of experimental and theoretical interest in the physics of few-body systems has provided deep, fundamental insights into a broad range of problems. few-body physics is a cross-cutting discipline not restricted to conventional subject areas such as nuclear physics or atomic or molecular physics. to... | universal few-body physics and cluster formation |
one-dimensional quasiperiodic systems with power-law hopping, 1 /ra, differ from both the standard aubry-andré (aa) model and from power-law systems with uncorrelated disorder. whereas in the aa model all single-particle states undergo a transition from ergodic to localized at a critical quasidisorder strength, short-r... | one-dimensional quasicrystals with power-law hopping |
synchronization is a phenomenon where interacting particles lock their motion and display non-trivial dynamics. despite intense efforts studying synchronization in systems without clear classical limits, no comprehensive theory has been found. we develop such a general theory based on novel necessary and sufficient alg... | algebraic theory of quantum synchronization and limit cycles under dissipation |
in quantum mechanics, a fundamental law prevents quantum communications to simultaneously achieve high rates and long distances. this limitation is well known for point-to-point protocols, where two parties are directly connected by a quantum channel, but not yet fully understood in protocols with quantum repeaters. he... | end-to-end capacities of a quantum communication network |
losses are ubiquitous in manipulating complex systems. they arise from our lack of control on the microscopic degrees of freedom of the system. a universal way to minimize losses is to consider adiabatic processes. these processes are, however, very slow, which significantly limits their power. in this work, we show ho... | minimizing irreversible losses in quantum systems by local counterdiabatic driving |
the successes and limitations of statistical sampling for a sequence of models studied in the context of lattice qcd are discussed and the need for new methods to deal with finite-density and real-time evolution is emphasized. it is shown that these lattice models can be reformulated using tensorial methods where the f... | tensor lattice field theory for renormalization and quantum computing |
the conventional theory of hydrodynamics describes the evolution in time of chaotic many-particle systems from local to global equilibrium. in a quantum integrable system, local equilibrium is characterized by a local generalized gibbs ensemble or equivalently a local distribution of pseudomomenta. we study time evolut... | solvable hydrodynamics of quantum integrable systems |
kibble-zurek theory models the dynamics of spontaneous symmetry breaking, which plays an important role in a wide variety of physical contexts, ranging from cosmology to superconductors. we explored these dynamics in a homogeneous system by thermally quenching an atomic gas with short-range interactions through the bos... | critical dynamics of spontaneous symmetry breaking in a homogeneous bose gas |
we consider the dynamics of the non-hermitian su-schrieffer-heeger model arising as the no-click limit of a continuously monitored free fermion chain where particles and holes are measured on two sublattices. the model has \mathcal{pt}𝒫𝒯-symmetry, which we show to spontaneously break as a function of the strength of ... | volume-to-area law entanglement transition in a non-hermitian free fermionic chain |
to use quantum systems for technological applications one first needs to preserve their coherence for macroscopic time scales, even at finite temperature. quantum error correction has made it possible to actively correct errors that affect a quantum memory. an attractive scenario is the construction of passive storage ... | quantum memories at finite temperature |
following the recent isolation of monolayer cri3 (ref. 1), many more two-dimensional van der waals magnetic materials have been isolated2-12. their incorporation in van der waals heterostructures offers a new platform for spintronics5-9, proximity magnetism13 and quantum spin liquids14. a primary question in this field... | enhancement of interlayer exchange in an ultrathin two-dimensional magnet |
recently, krylov complexity was proposed as a measure of complexity and chaoticity of quantum systems. we consider the stadium billiard as a typical example of the quantum mechanical system obtained by quantizing a classically chaotic system, and numerically evaluate krylov complexity for operators and states. despite ... | krylov complexity and chaos in quantum mechanics |
we propose a new approach to probing ergodicity and its breakdown in one-dimensional quantum many-body systems based on their response to a local perturbation. we study the distribution of matrix elements of a local operator between the system's eigenstates, finding a qualitatively different behavior in the many-body l... | criterion for many-body localization-delocalization phase transition |
the experimental investigation of quantum devices incorporating mechanical resonators has opened up new frontiers in the study of quantum mechanics at a macroscopic level. it has recently been shown that surface acoustic waves (saws) can be piezoelectrically coupled to superconducting qubits, and confined in high-quali... | circuit quantum acoustodynamics with surface acoustic waves |
contrary to the conventional wisdom in hermitian systems, a continuous quantum phase transition between gapped phases is shown to occur without closing the energy gap δ in non-hermitian quantum many-body systems. here, the relevant length scale ξ ≃vlr/δ diverges because of the breakdown of the lieb-robinson bound on th... | continuous phase transition without gap closing in non-hermitian quantum many-body systems |
cavity optomagnonics has emerged as a promising platform for studying coherent photon-spin interactions as well as tunable microwave-to-optical conversion. however, current implementation of cavity optomagnonics in ferrimagnetic crystals remains orders of magnitude larger in volume than state-of-the-art cavity optomech... | waveguide cavity optomagnonics for microwave-to-optics conversion |
we present random quantum circuit models for nonunitary quantum dynamics of free fermions in one spatial dimension. numerical simulations reveal that the dynamics tends toward steady states with logarithmic violations of the entanglement area law and power law correlation functions. moreover, starting with a short-rang... | emergent conformal symmetry in nonunitary random dynamics of free fermions |
a quantum system subject to continuous measurement and postselection evolves according to a non-hermitian hamiltonian. we show that, as one increases the strength of postselection, this non-hermitian hamiltonian can undergo a spectral phase transition. on one side of this phase transition (for weak postselection), an i... | entanglement and purification transitions in non-hermitian quantum mechanics |
equilibrium spatiotemporal correlation functions are central to understanding weak nonequilibrium physics. in certain local one-dimensional classical systems with three conservation laws they show universal features. namely, fluctuations around ballistically propagating sound modes can be described by the celebrated ka... | kardar-parisi-zhang physics in the quantum heisenberg magnet |
classical dynamical density functional theory (ddft) is one of the cornerstones of modern statistical mechanics. it is an extension of the highly successful method of classical density functional theory (dft) to nonequilibrium systems. originally developed for the treatment of simple and complex fluids, ddft is now app... | classical dynamical density functional theory: from fundamentals to applications |
continuing the previous initiatives [1, 2], we pursue the exploration of operator growth and krylov complexity in dissipative open quantum systems. in this paper, we resort to the bi-lanczos algorithm generating two bi-orthogonal krylov spaces, which individually generate non-orthogonal subspaces. unlike the previously... | on krylov complexity in open systems: an approach via bi-lanczos algorithm |
quantum chaos refers to signatures of classical chaos found in the quantum domain. recently, it has become common to equate the exponential behavior of out-of-time order correlators (otocs) with quantum chaos. the quantum-classical correspondence between the otoc exponential growth and chaos in the classical limit has ... | positive quantum lyapunov exponents in experimental systems with a regular classical limit |
at present, electric lighting accounts for ~15% of global power consumption and thus the adoption of efficient, low-cost lighting technologies is important. halide perovskites have been shown to be good emitters of pure red, green and blue light, but an efficient source of broadband white electroluminescence suitable f... | efficient and bright white light-emitting diodes based on single-layer heterophase halide perovskites |
we study scrambling in connection with multipartite entanglement dynamics in regular and chaotic long-range spin chains, characterized by a well-defined semi-classical limit. for regular dynamics, scrambling and entanglement dynamics are found to be very different: up to the ehrenfest time, they rise side by side, depa... | scrambling and entanglement spreading in long-range spin chains |
in the presence of disorder, an interacting closed quantum system can undergo many-body localization (mbl) and fail to thermalize. however, over long times, even weak couplings to any thermal environment will necessarily thermalize the system and erase all signatures of mbl. this presents a challenge for experimental i... | signatures of many-body localization in a controlled open quantum system |
we show that confinement in the quantum ising model leads to nonthermal eigenstates, in both continuum and lattice theories, in both one (1d) and two dimensions (2d). in the ordered phase, the presence of a confining longitudinal field leads to a profound restructuring of the excitation spectrum, with the low-energy tw... | nonthermal states arising from confinement in one and two dimensions |
we consider topological phases in periodically driven (floquet) systems exhibiting many-body localization, protected by a symmetry g . we argue for a general correspondence between such phases and topological phases of undriven systems protected by symmetry z ⋊g where the additional z accounts for the discrete time-tra... | classification of topological phases in periodically driven interacting systems |
deriving the laws of thermodynamics from a microscopic picture is a central quest of statistical mechanics. this tutorial focuses on the derivation of the first and second law for isolated and open quantum systems far from equilibrium, where such foundational questions also become practically relevant for emergent nano... | first and second law of quantum thermodynamics: a consistent derivation based on a microscopic definition of entropy |
in the past years classical wave-systems have constituted an excellent platform for emulating complex quantum phenomena. this approach has been especially fruitful in demonstrating topological phenomena in photonics and acoustics: from chiral edge states of chern insulators and helical edge states of topological insula... | demonstration of a third-order hierarchy of topological states in a three-dimensional acoustic metamaterial |
we consider the symmetry resolved rényi entropies in the one dimensional tight binding model, equivalent to the spin-1/2 xx chain in a magnetic field. we exploit the generalised fisher-hartwig conjecture to obtain the asymptotic behaviour of the entanglement entropies with a flux charge insertion at leading and sublead... | symmetry resolved entanglement in free fermionic systems |
quantum algorithms use the principles of quantum mechanics, such as, for example, quantum superposition, in order to solve particular problems outperforming standard computation. they are developed for cryptography, searching, optimization, simulation, and solving large systems of linear equations. here, we implement g... | operating quantum states in single magnetic molecules: implementation of grover's quantum algorithm |
by investigating information flow between a general parity-time (p t -)symmetric non-hermitian system and an environment, we find that the complete information retrieval from the environment can be achieved in the p t -unbroken phase, whereas no information can be retrieved in the p t -broken phase. the p t -transition... | information retrieval and criticality in parity-time-symmetric systems |
we establish an operational characterization of general convex resource theories—describing the resource content of not only states but also measurements and channels, both within quantum mechanics and in general probabilistic theories (gpts)—in the context of state and channel discrimination. we find that discriminati... | general resource theories in quantum mechanics and beyond: operational characterization via discrimination tasks |
we derive a generalized wave-particle duality relation for arbitrary multipath quantum interference phenomena. beyond the conventional notion of the wave nature of a quantum system, i.e., the interference fringe visibility, we introduce a quantifier as the normalized quantum coherence, recently defined in the framework... | duality of quantum coherence and path distinguishability |
tunnelling is one of the most characteristic phenomena of quantum physics, underlying processes such as photosynthesis and nuclear fusion, as well as devices ranging from superconducting quantum interference device (squid) magnetometers to superconducting qubits for quantum computers. the question of how long a particl... | measurement of the time spent by a tunnelling atom within the barrier region |
tandem solar cells using only metal-halide perovskite sub-cells are an attractive choice for next-generation solar cells. however, the progress in developing efficient all-perovskite tandem solar cells has been hindered by the lack of high-performance low-bandgap perovskite solar cells. here, we report efficient mixed ... | low-bandgap mixed tin-lead iodide perovskite absorbers with long carrier lifetimes for all-perovskite tandem solar cells |
in this work, we find that the complexity of quantum many-body states, defined as a spread in the krylov basis, may serve as a probe that distinguishes topological phases of matter. we illustrate this analytically in one of the representative examples, the su-schrieffer-heeger model, finding that spread complexity beco... | quantum complexity and topological phases of matter |
we investigate two separate notions of dynamical phase transitions in the two-dimensional nearest-neighbor transverse-field ising model on a square lattice using matrix product states and a hybrid infinite time-evolving block decimation algorithm, where the model is implemented on an infinitely long cylinder with a fin... | dynamical phase transitions in the two-dimensional transverse-field ising model |
1. fundamental concepts; 2. quantum dynamics; 3. theory of angular momentum; 4. symmetry in quantum mechanics; 5. approximation methods; 6. scattering theory; 7. identical particles; 8. relativistic quantum mechanics; appendix a. electromagnetic units; appendix b. brief summary of elementary solutions to schrödinger's ... | modern quantum mechanics |
the quantum mechanical position operators, and their products, are not well-defined in systems obeying periodic boundary conditions. here we extend the work of resta [phys. rev. lett. 80, 1800 (1998), 10.1103/physrevlett.80.1800], who developed a formalism to calculate the electronic polarization as an expectation valu... | many-body electric multipole operators in extended systems |
in this work we discuss the existence of time-translation symmetry breaking in a kicked infinite-range-interacting clean spin system described by the lipkin-meshkov-glick model. this floquet time crystal is robust under perturbations of the kicking protocol, its existence being intimately linked to the underlying z2 sy... | floquet time crystal in the lipkin-meshkov-glick model |
we present a scheme to entangle two microwave fields by using the nonlinear magnetostrictive interaction in a ferrimagnet. the magnetostrictive interaction enables the coupling between a magnon mode (spin wave) and a mechanical mode in the ferrimagnet, and the magnon mode simultaneously couples to two microwave cavity ... | magnetostrictively induced stationary entanglement between two microwave fields |
we introduce a topological quantum number—coined dynamical topological order parameter (dtop)—that is dynamically defined in the real-time evolution of a quantum many-body system and represented by a momentum space winding number of the pancharatnam geometric phase. our construction goes conceptually beyond the standar... | dynamical topological order parameters far from equilibrium |
van der waals interfaces can be formed by layer stacking without regard to lattice constants or symmetries of individual building blocks. we engineered the symmetry of a van der waals interface of tungsten selenide and black phosphorus and realized in-plane electronic polarization that led to the emergence of a spontan... | a van der waals interface that creates in-plane polarization and a spontaneous photovoltaic effect |
we present evidence for a duality between jackiw-teitelboim gravity minimally coupled to a free massive scalar field and a single-trace two-matrix model. one matrix is the hamiltonian $h$ of a holographic disorder-averaged quantum mechanics, while the other matrix is the light operator $\cal o$ dual to the bulk scalar ... | jt gravity with matter, generalized eth, and random matrices |
quantum technologies represent a rapidly evolving field in which the specific properties of quantum mechanical systems are exploited to enhance the performance of various applications such as sensing, transmission, and processing of information. such devices can be useful only if the quantum systems also interact with ... | colloquium: protecting quantum information against environmental noise |
the standard quantum limit bounds the precision of measurements that can be achieved by ensembles of uncorrelated particles. fundamentally, this limit arises from the non-commuting nature of quantum mechanics, leading to the presence of fluctuations often referred to as quantum projection noise. quantum metrology relie... | scalable spin squeezing in a dipolar rydberg atom array |
einstein, podolsky and rosen (epr) pointed out in their famous paradox that two quantum-entangled particles can have perfectly correlated positions and momenta. such correlations give evidence for the nonlocality of quantum mechanics and form the basis for quantum cryptography and teleportation. epr steering is the non... | multipartite einstein-podolsky-rosen steering and genuine tripartite entanglement with optical networks |
we study a kinetically constrained pair-hopping model that arises within a landau level in the quantum hall effect. at filling ν =1 /3 , the model exactly maps onto the so-called "pxp model," a constrained model for the rydberg atom chain that is numerically known to exhibit eth-violating states in the middle of the sp... | quantum many-body scars in a landau level on a thin torus |
we determine the higher symmetries of 5d scfts engineered from m-theory on a c3/γ background for γ a finite subgroup of s u (3 ). this resolves a longstanding question as to how to extract this data when the resulting singularity is nontoric (when γ is non-abelian) and/or not isolated (when the action of γ has fixed lo... | higher symmetries of 5d orbifold scfts |
the hamiltonian of an isolated quantum-mechanical system determines its dynamics and physical behavior. this study investigates the possibility of learning and utilizing a system's hamiltonian and its variational thermal state estimation for data analysis techniques. for this purpose, we employ the method of quantum ha... | quantum-probabilistic hamiltonian learning for generative modeling and anomaly detection |
global symmetries of quantum many-body systems can be spontaneously broken. whenever this mechanism happens, the ground state is degenerate and one encounters an ordered phase. in this study, our objective is to investigate this phenomenon by examining the entanglement asymmetry of a specific region. this quantity, whi... | entanglement asymmetry in the ordered phase of many-body systems: the ising field theory |
in an isolated system, the time evolution of a given observable in the heisenberg picture can be efficiently represented in krylov space. in this representation, an initial operator becomes increasingly complex as time goes by, a feature that can be quantified by the krylov complexity. we introduce a fundamental and un... | ultimate speed limits to the growth of operator complexity |
we study a notion of operator growth known as krylov complexity in free and interacting massive scalar quantum field theories in d-dimensions at finite temperature. we consider the effects of mass, one-loop self-energy due to perturbative interactions, and finite ultraviolet cutoffs in continuous momentum space. these ... | krylov complexity in free and interacting scalar field theories with bounded power spectrum |
we demonstrate a relation between nielsen's approach toward circuit complexity and krylov complexity through a particular construction of quantum state space geometry. we start by associating kähler structures on the full projective hilbert space of low rank algebras. this geometric structure of the states in the hilbe... | spread complexity as classical dilaton solutions |
we explain the appearance of magic angles and fractional chern insulators in twisted k-valley homobilayer transition metal dichalcogenides by mapping their continuum model to a landau level problem. our approach relies on an adiabatic approximation for the quantum mechanics of valence band holes in a layer-pseudospin f... | magic angles and fractional chern insulators in twisted homobilayer tmds |
nonreciprocal circuit elements form an integral part of modern measurement and communication systems. mathematically they require breaking of time-reversal symmetry, typically achieved using magnetic materials and more recently using the quantum hall effect, parametric permittivity modulation or josephson nonlinearitie... | mechanical on-chip microwave circulator |
we control the electronic structure of the silicon-vacancy (siv) color-center in diamond by changing its static strain environment with a nano-electro-mechanical system. this allows deterministic and local tuning of siv optical and spin transition frequencies over a wide range, an essential step towards multiqubit netw... | strain engineering of the silicon-vacancy center in diamond |
nonergodic dynamical systems display anomalous transport properties. prominent examples are integrable quantum systems, whose exceptional properties are diverging dc conductivities. in this letter, we explain the microscopic origin of ideal conductivity by resorting to the thermodynamic particle content of a system. us... | microscopic origin of ideal conductivity in integrable quantum models |
the heptazine-based polymer melon (also known as graphitic carbon nitride, g-c3n4) is a promising photocatalyst for hydrogen evolution. nonetheless, attempts to improve its inherently low activity are rarely based on rational approaches because of a lack of fundamental understanding of its mechanistic operation. here w... | rational design of carbon nitride photocatalysts by identification of cyanamide defects as catalytically relevant sites |
we propose a class of nonintegrable quantum spin chains that exhibit quantum many-body scars even in the presence of disorder. with the use of the so-called onsager symmetry, we construct scarred models for arbitrary spin quantum number s . there are two types of scar states, namely, coherent states associated with an ... | onsager's scars in disordered spin chains |
we introduce a complex-plane generalization of the consecutive level-spacing ratio distribution used to distinguish regular from chaotic quantum spectra. our approach features the distribution of complex-valued ratios between nearest- and next-to-nearest-neighbor spacings. we show that this quantity can successfully de... | complex spacing ratios: a signature of dissipative quantum chaos |
the choice of simulation methods in computational materials science is driven by a fundamental trade-off: bridging large time- and length-scales with highly accurate simulations at an affordable computational cost. venturing the investigation of complex phenomena on large scales requires fast yet accurate computational... | machine-learned potentials for next-generation matter simulations |
an optical network of superconducting quantum bits (qubits) is an appealing platform for quantum communication and distributed quantum computing, but developing a quantum-compatible link between the microwave and optical domains remains an outstanding challenge. operating at t < 100 mk temperatures, as required for ... | harnessing electro-optic correlations in an efficient mechanical converter |
thermodynamic uncertainty relations express a trade-off between precision, defined as the noise-to-signal ratio of a generic current, and the amount of associated entropy production. these results have deep consequences for autonomous heat engines operating at steady state, imposing an upper bound for their efficiency ... | thermodynamic uncertainty relation in slowly driven quantum heat engines |
this book aims to develop a general framework of condensed matter theory in phase space, instead of configuration space, of a dynamical system. different from euclidean real space, phase space is embedded with symplectic geometry in classical mechanics or noncommutative geometry in quantum mechanics. arbitrary lattice ... | phase space crystals; condensed matter in dynamical systems |
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