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the exceptional enhancement of raman scattering by localized plasmonic resonances in the near field of metallic nanoparticles, surfaces or tips (sers, ters) has enabled spectroscopic fingerprinting down to the single molecule level. the conventional explanation attributes the enhancement to the subwavelength confinemen... | molecular cavity optomechanics as a theory of plasmon-enhanced raman scattering |
a fundamental challenge in digital quantum simulation (dqs) is the control of inherent errors. these appear when discretizing the time evolution generated by the hamiltonian of a quantum many-body system as a sequence of quantum gates, called trotterization. here, we show that quantum localization-by constraining the t... | quantum localization bounds trotter errors in digital quantum simulation |
generalized hydrodynamics (ghd) is a large-scale theory for the dynamics of many-body integrable systems. it consists of an infinite set of conservation laws for quasi-particles traveling with effective ("dressed") velocities that depend on the local state. we show that these equations can be recast into a geometric dy... | a geometric viewpoint on generalized hydrodynamics |
nanofabricated mechanical resonators are gaining significant momentum among potential quantum technologies due to their unique design freedom and independence from naturally occurring resonances. as their functionality is widely detached from material choice, they constitute ideal tools for transducers—intermediaries b... | a quantum memory at telecom wavelengths |
we provide a new hydrodynamic framework to describe out-of-equilibrium integrable systems with space-time inhomogeneous interactions. our result builds up on the recently introduced generalized hydrodynamics (ghd). the method allows us to analytically describe the dynamics during generic space-time-dependent smooth mod... | generalized hydrodynamics with space-time inhomogeneous interactions |
numerical studies of the transition between néel and valence bond solid phases in two-dimensional quantum antiferromagnets give strong evidence for the remarkable scenario of deconfined criticality, but display strong violations of finite-size scaling that are not yet understood. we show how to realize the universal ph... | deconfined quantum criticality, scaling violations, and classical loop models |
classical shadow tomography is a powerful randomized measurement protocol for predicting many properties of a quantum state with few measurements. two classical shadow protocols have been extensively studied in the literature: the single-qubit (local) pauli measurement, which is well suited for predicting local operato... | scalable and flexible classical shadow tomography with tensor networks |
extending the notion of symmetry protected topological phases to insulating antiferromagnets (afs) described in terms of opposite magnetic dipole moments associated with the magnetic n e ´el order, we establish a bosonic counterpart of topological insulators in semiconductors. making use of the aharonov-casher effect, ... | magnonic topological insulators in antiferromagnets |
optomechanical systems explore and exploit the coupling between light and the mechanical motion of macroscopic matter. a nonlinear coupling offers rich new physics, in both quantum and classical regimes. we investigate a dynamic, as opposed to the usually studied static, nonlinear optomechanical system, comprising a na... | nonlinear dynamics and strong cavity cooling of levitated nanoparticles |
spin-orbit interactions lead to distinctive functionalities in photonic systems. they exploit the analogy between the quantum mechanical description of a complex electronic spin-orbit system and synthetic hamiltonians derived for the propagation of electromagnetic waves in dedicated spatial structures. we realize an ar... | engineering spin-orbit synthetic hamiltonians in liquid-crystal optical cavities |
we show numerically that the "deconfined" quantum critical point between the néel antiferromagnet and the columnar valence-bond solid, for a square lattice of spin 1 /2 , has an emergent so(5) symmetry. this symmetry allows the néel vector and the valence-bond solid order parameter to be rotated into each other. it is ... | emergent so(5) symmetry at the néel to valence-bond-solid transition |
we examine the many-body localization (mbl) phase transition in one-dimensional quantum systems with quenched randomness and short-range interactions. following recent works, we use a strong-randomness renormalization group (rg) approach where the phase transition is due to the so-called avalanche instability of the mb... | many-body localization near the critical point |
out-of-time-order correlators (otocs) have been proposed as sensitive probes for chaos in interacting quantum systems. they exhibit a characteristic classical exponential growth, but saturate beyond the so-called scrambling or ehrenfest time τe in the quantum correlated regime. here we present a path-integral approach ... | many-body quantum interference and the saturation of out-of-time-order correlators |
there is a dichotomy in the nonequilibrium dynamics of quantum many-body systems. in the presence of integrability, expectation values of local operators equilibrate to values described by a generalized gibbs ensemble, which retains extensive memory about the initial state of the system. on the other hand, in generic s... | signatures of rare states and thermalization in a theory with confinement |
we show that nitrogen-vacancy (nv) centers in diamond interfaced with a suspended carbon nanotube carrying a dc current can facilitate a spin-nanomechanical hybrid device. we demonstrate that strong magnetomechanical interactions between a single nv spin and the vibrational mode of the suspended nanotube can be enginee... | hybrid quantum device with nitrogen-vacancy centers in diamond coupled to carbon nanotubes |
laser cooling and trapping of atoms and atomic ions has led to advances including the observation of exotic phases of matter, the development of precision sensors and state-of-the-art atomic clocks. the same level of control in molecules could also lead to important developments such as controlled chemical reactions an... | preparation and coherent manipulation of pure quantum states of a single molecular ion |
quantum-mechanically correlated (entangled) states of many particles are of interest in quantum information, quantum computing and quantum metrology. metrologically useful entangled states of large atomic ensembles have been experimentally realized, but these states display gaussian spin distribution functions with a n... | entanglement with negative wigner function of almost 3,000 atoms heralded by one photon |
we propose nonreciprocal phonon lasing in a coupled cavity system composed of an optomechanical resonator and a spinning resonator. we show that the optical sagnac effect leads to significant modifications in both the mechanical gain and the power threshold for phonon lasing. more importantly, the phonon lasing in this... | nonreciprocal phonon laser |
despite tremendous theoretical efforts to understand subtleties of the many-body localization (mbl) transition, many questions remain open, in particular concerning its critical properties. here we make the key observation that mbl in one dimension is accompanied by a spin freezing mechanism which causes chain breaks i... | chain breaking and kosterlitz-thouless scaling at the many-body localization transition in the random-field heisenberg spin chain |
work and quantum correlations are two fundamental resources in thermodynamics and quantum information theory. in this work, we study how to use correlations among quantum systems to optimally store work. we analyze this question for isolated quantum ensembles, where the work can be naturally divided into two contributi... | extractable work from correlations |
we experimentally investigate the first-order correlation function of a trapped fermi gas in the two-dimensional bec-bcs crossover. we observe a transition to a low-temperature superfluid phase with algebraically decaying correlations. we show that the spatial coherence of the entire trapped system can be characterized... | observation of the berezinskii-kosterlitz-thouless phase transition in an ultracold fermi gas |
we employ unsupervised learning tools to identify the dynamical phases and their measurement-induced transitions in quantum systems subject to the combined action of unitary evolution and stochastic local measurements. specifically, we show that the principal component analysis and the intrinsic dimension estimation pr... | measurement-induced criticality as a data-structure transition |
quantum key distribution (qkd) provides information-theoretic security based on the laws of quantum mechanics. the desire to reduce costs and increase robustness in real-world applications has motivated the study of coexistence between qkd and intense classical data traffic in a single fiber. previous works on coexiste... | integrating quantum key distribution with classical communications in backbone fiber network |
the quantized orbital angular momentum (oam) of photons offers an additional degree of freedom and topological protection from noise. photonic oam states have therefore been exploited in various applications ranging from studies of quantum entanglement and quantum information science to imaging. the oam states of elect... | controlling neutron orbital angular momentum |
we present a new variational method based on the matrix product operator (mpo) ansatz, for finding the steady state of dissipative quantum chains governed by master equations of the lindblad form. instead of requiring an accurate representation of the system evolution until the stationary state is attained, the algorit... | variational matrix product operators for the steady state of dissipative quantum systems |
we derive laws for the distribution of quantum steering among different parties in multipartite gaussian states under gaussian measurements. we prove that a monogamy relation akin to the generalized coffman-kundu-wootters inequality holds quantitatively for a recently introduced measure of gaussian steering. we then de... | multipartite gaussian steering: monogamy constraints and quantum cryptography applications |
we excite the vacuum of a relativistic theory of bosons coupled to a u (1 ) gauge field in 1 +1 dimensions (bosonic schwinger model) out of equilibrium by creating a spatially separated particle-antiparticle pair connected by a string of electric field. during the evolution, we observe a strong confinement of bosons wi... | confinement and lack of thermalization after quenches in the bosonic schwinger model |
quantum light-matter systems at strong coupling are notoriously challenging to analyze due to the need to include states with many excitations in every coupled mode. we propose a nonperturbative approach to analyze light-matter correlations at all interaction strengths. the key element of our approach is a unitary tran... | cavity quantum electrodynamics at arbitrary light-matter coupling strengths |
we study the entanglement dynamics generated by quantum quenches in the quantum cellular automaton rule $54$. we consider the evolution from a recently introduced class of solvable initial states. states in this class relax (locally) to a one-parameter family of gibbs states and the thermalisation dynamics of local obs... | entanglement dynamics in rule 54: exact results and quasiparticle picture |
quantum coherence is a key element in topical research on quantum resource theories and a primary facilitator for design and implementation of quantum technologies. however, the resourcefulness of quantum coherence is severely restricted by environmental noise, which is indicated by the loss of information in a quantum... | maximally coherent mixed states: complementarity between maximal coherence and mixedness |
using a matter wave lens and a long time of flight, we cool an ensemble of 87rb atoms in two dimensions to an effective temperature of less than 5 0-30+50 pk . a short pulse of red-detuned light generates an optical dipole force that collimates the ensemble. we also report a three-dimensional magnetic lens that substan... | matter wave lensing to picokelvin temperatures |
we demonstrate a new mechanical transduction platform for individual spin qubits. in our approach, single micromagnets are trapped using a type-ii superconductor in proximity of spin qubits, enabling direct magnetic coupling between the two systems. controlling the distance between the magnet and the superconductor dur... | single-spin magnetomechanics with levitated micromagnets |
quantum many-body scar states are exceptional finite energy density eigenstates in an otherwise thermalizing system that do not satisfy the eigenstate thermalization hypothesis. we investigate the fate of exact many-body scar states under perturbations. at small system sizes, deformed scar states described by perturbat... | slow thermalization of exact quantum many-body scar states under perturbations |
the ability to make rapid and accurate predictions on bandgaps of double perovskites is of much practical interest for a range of applications. while quantum mechanical computations for high-fidelity bandgaps are enormously computation-time intensive and thus impractical in high throughput studies, informatics-based st... | machine learning bandgaps of double perovskites |
in these four lectures i describe basic ideas and methods applicable to both classical and quantum systems displaying slow relaxation and non-equilibrium dynamics. the first half of these notes considers classical systems, and the second half, quantum systems. in lecture 1, i briefly review the glass transition problem... | aspects of non-equilibrium in classical and quantum systems: slow relaxation and glasses, dynamical large deviations, quantum non-ergodicity, and open quantum dynamics |
quantum magnets have occupied the fertile ground between many-body theory and low-temperature experiments on real materials since the early days of quantum mechanics. however, our understanding of even deceptively simple systems of interacting spin-1/2 particles is far from complete. the quantum square-lattice heisenbe... | fractional excitations in the square-lattice quantum antiferromagnet |
monitored quantum circuits (mrcs) exhibit a measurement-induced phase transition between area-law and volume-law entanglement scaling. mrcs with a conserved charge additionally exhibit two distinct volume-law entangled phases that cannot be characterized by equilibrium notions of symmetry-breaking or topological order,... | field theory of charge sharpening in symmetric monitored quantum circuits |
a chemical reaction is a process that leads to the chemical transformation of one set of chemical substances to another. however, the precise and real-time detection of the reaction rate remains challenging due to its fast and dynamical process. in this paper, the photonic spin hall effect is proposed to realize the ul... | ultrasensitive and real-time detection of chemical reaction rate based on the photonic spin hall effect |
quantum computers promise to efficiently simulate quantum dynamics, a classically intractable task central to fields ranging from chemistry to high-energy physics. yet, quantum computational advantage has only been demonstrated for artificial tasks such as random circuit sampling, and hardware limitations and noise hav... | holographic dynamics simulations with a trapped-ion quantum computer |
we study novel three-dimensional gapped quantum phases of matter which support quasiparticles with restricted mobility, including immobile "fracton" excitations. so far, most existing fracton models may be instructively viewed as generalized abelian lattice gauge theories. here, by analogy with dijkgraaf-witten topolog... | twisted fracton models in three dimensions |
two-particle interference is a fundamental feature of quantum mechanics, and is even less intuitive than wave-particle duality for a single particle. in this duality, classical concepts--wave or particle--are still referred to, and interference happens in ordinary space-time. on the other hand, two-particle interferenc... | atomic hong-ou-mandel experiment |
we study the effects of periodic driving on a variant of the bernevig-hughes-zhang (bhz) model defined on a square lattice. in the absence of driving, the model has both topological and nontopological phases depending on the different parameter values. we also study the anisotropic bhz model and show that, unlike the i... | generating a second-order topological insulator with multiple corner states by periodic driving |
quantum circuit dynamics with local projective measurements can realize a rich spectrum of entangled states of quantum matter. motivated by the physics of the kitaev quantum spin liquid [a. kitaev, ann. phys. 321, 2 (2006), 10.1016/j.aop.2005.10.005], we study quantum circuit dynamics in 2 +1 dimensions involving local... | monitored quantum dynamics and the kitaev spin liquid |
subdiffusion is a generic feature of chaotic many-body dynamics with multipole conservation laws and subsystem symmetries. we numerically study this subdiffusive dynamics, using quantum automaton random unitary circuits, in a broad range of models including one-dimensional models with dipole and quadrupole conservation... | multipole conservation laws and subdiffusion in any dimension |
random electron systems show rich phases such as anderson insulator, diffusive metal, quantum hall and quantum anomalous hall insulators, weyl semimetal, as well as strong/weak topological insulators. eigenfunctions of each matter phase have specific features, but owing to the random nature of systems, determining the ... | deep learning the quantum phase transitions in random two-dimensional electron systems |
controlling the electrical conductance and in particular the occurrence of quantum interference in single-molecule junctions through gating effects has potential for the realization of high-performance functional molecular devices. in this work we used an electrochemically gated, mechanically controllable break junctio... | anti-resonance features of destructive quantum interference in single-molecule thiophene junctions achieved by electrochemical gating |
the problem of characterizing low-temperature spin dynamics in antiferromagnetic spin chains has so far remained elusive. here we reinvestigate it by focusing on isotropic antiferromagnetic chains whose low-energy effective field theory is governed by the quantum nonlinear sigma model. employing an exact nonperturbativ... | anomalous spin diffusion in one-dimensional antiferromagnets |
we present a novel scheme to accurately predict atomic forces as vector quantities, rather than sets of scalar components, by gaussian process (gp) regression. this is based on matrix-valued kernel functions, on which we impose the requirements that the predicted force rotates with the target configuration and is indep... | accurate interatomic force fields via machine learning with covariant kernels |
shannon's theory of information was built on the assumption that the information carriers were classical systems. its quantum counterpart, quantum shannon theory, explores the new possibilities arising when the information carriers are quantum systems. traditionally, quantum shannon theory has focused on scenarios wher... | quantum shannon theory with superpositions of trajectories |
a salient feature of solid-state quantum-hall-type topological materials in two dimensions is the presence of conducting electronic edge states that are insensitive to scattering by disorder. such unidirectional edge states have been predicted and observed in many other experimental settings, including photonics, mecha... | observation of unidirectional solitonlike edge states in nonlinear floquet topological insulators |
using generalized hydrodynamics (ghd), we develop the euler hydrodynamics of classical integrable field theory. classical field ghd is based on a known formalism for gibbs ensembles of classical fields, that resembles the thermodynamic bethe ansatz of quantum models, which we extend to generalized gibbs ensembles (gges... | generalized hydrodynamics of classical integrable field theory: the sinh-gordon model |
anomalous finite-temperature transport has recently been observed in numerical studies of various integrable models in one dimension; these models share the feature of being invariant under a continuous non-abelian global symmetry. this work offers a comprehensive group-theoretic account of this elusive phenomenon. for... | superuniversality of superdiffusion |
we show how to realize fast and high-fidelity quantum nondemolition qubit readout using longitudinal qubit-oscillator interaction. this is accomplished by modulating the longitudinal coupling at the cavity frequency. the qubit-oscillator interaction then acts as a qubit-state dependent drive on the cavity, a situation ... | fast quantum nondemolition readout by parametric modulation of longitudinal qubit-oscillator interaction |
generalized hydrodynamics is a recent theory that describes large-scale transport properties of one-dimensional integrable models. it is built on the (typically infinitely many) local conservation laws present in these systems and leads to a generalized euler-type hydrodynamic equation. despite the successes of the the... | current operators in bethe ansatz and generalized hydrodynamics: an exact quantum-classical correspondence |
vibrational ultrastrong coupling, where the light-matter coupling strength is comparable to the vibrational frequency of molecules, presents new opportunities to probe the interactions between molecules and zero-point fluctuations, harness cavity-modified chemical reactions and develop novel devices in the mid-infrared... | ultrastrong plasmon-phonon coupling via epsilon-near-zero nanocavities |
observing and controlling macroscopic quantum systems has long been a driving force in quantum physics research. in particular, strong coupling between individual quantum systems and mechanical oscillators is being actively studied1-3. whereas both read-out of mechanical motion using coherent control of spin systems4-9... | spin-cooling of the motion of a trapped diamond |
water is central across much of the physical and biological sciences and exhibits physical properties that are qualitatively distinct from those of most other liquids. understanding the microscopic basis of water's peculiar properties remains an active area of research. one intriguing hypothesis is that liquid water ca... | signatures of a liquid-liquid transition in an ab initio deep neural network model for water |
we prove the existence of nonequilibrium phases of matter in the prethermal regime of periodically driven, long-range interacting systems, with power-law exponent α >d , where d is the dimensionality of the system. in this context, we predict the existence of a disorder-free, prethermal discrete time crystal in one ... | long-range prethermal phases of nonequilibrium matter |
three-dimensional (3d) dirac semimetals exist close to topological phase boundaries which, in principle, should make it possible to drive them into exotic new phases, such as topological superconductivity, by breaking certain symmetries. a practical realization of this idea has, however, hitherto been lacking. here we ... | unconventional superconductivity at mesoscopic point contacts on the 3d dirac semimetal cd3as2 |
there is a large body of evidence for the potential of greater computational power using information carriers that are quantum mechanical over those governed by the laws of classical mechanics. but the question of the exact nature of the power contributed by quantum mechanics remains only partially answered. furthermor... | quantum sampling problems, bosonsampling and quantum supremacy |
in 1928, dirac published an equation1 that combined quantum mechanics and special relativity. negative-energy solutions to this equation, rather than being unphysical as initially thought, represented a class of hitherto unobserved and unimagined particles—antimatter. the existence of particles of antimatter was confir... | characterization of the 1s-2s transition in antihydrogen |
in this work, we explore the interplay of confinement, string breaking and entanglement asymmetry on a 1d quantum ising chain. we consider the evolution of an initial domain wall and show that, surprisingly, while the introduction of confinement through a longitudinal field typically suppresses entanglement, it can als... | confinement and kink entanglement asymmetry on a quantum ising chain |
low-energy dynamics of many-body fracton excitations necessary to describe topological defects should be governed by a novel type of hydrodynamic theory. we use a poisson bracket approach to systematically derive hydrodynamic equations from conservation laws of scalar theories with fracton excitations. we study three c... | hydrodynamics of ideal fracton fluids |
a fundamental principle of chaotic quantum dynamics is that local subsystems eventually approach a thermal equilibrium state. large subsystems thermalize slower: their approach to equilibrium is limited by the hydrodynamic build-up of large-scale fluctuations. for classical out-of-equilibrium systems, the framework of ... | emergence of fluctuating hydrodynamics in chaotic quantum systems |
the presence of flat bands is a source of localization in lattice systems. while flat bands are often unstable with respect to interactions between the particles, they can persist in certain cases. we consider a diamond ladder with transverse hopping that possesses such stable flat bands and show that many-body localiz... | many-body localization in translationally invariant diamond ladders with flat bands |
non-equilibrium dynamics of many-body quantum systems under the effect of measurement protocols is attracting an increasing amount of attention. it has been recently revealed that measurements may induce different non-equilibrium regimes and an abrupt change in the scaling-law of the bipartite entanglement entropy. how... | full counting statistics as probe of measurement-induced transitions in the quantum ising chain |
conserved-charge densities are very special observables in quantum many-body systems as, by construction, they encode information about the dynamics. therefore, their evolution is expected to be of much simpler interpretation than that of generic observables and to return universal information on the state of the syste... | dynamics of charge fluctuations from asymmetric initial states |
in quantum mechanical many-body systems, long-range and anisotropic interactions promote rich spatial structure and can lead to quantum frustration, giving rise to a wealth of complex, strongly correlated quantum phases1. long-range interactions play an important role in nature; however, quantum simulations of lattice ... | dipolar quantum solids emerging in a hubbard quantum simulator |
entangling microwave-frequency superconducting quantum processors through optical light at ambient temperature would enable means of secure communication and distributed quantum information processing1. however, transducing quantum signals between these disparate regimes of the electro-magnetic spectrum remains an outs... | superconducting-qubit readout via low-backaction electro-optic transduction |
generic many-body systems coupled to an environment lose their quantum entanglement due to decoherence and evolve to a mixed state with only classical correlations. here, we show that measurements can stabilize quantum entanglement within open quantum systems. specifically, in random unitary circuits with dephasing at ... | measurement-induced power-law negativity in an open monitored quantum circuit |
thermodynamics serves as a universal means for studying physical systems from an energy perspective. in recent years, with the establishment of the field of stochastic and quantum thermodynamics, the ideas of thermodynamics have been generalized to small fluctuating systems. independently developed in mathematics and s... | thermodynamic unification of optimal transport: thermodynamic uncertainty relation, minimum dissipation, and thermodynamic speed limits |
the dynamics of many-body systems spanning condensed matter, cosmology, and beyond are hypothesized to be universal when the systems cross continuous phase transitions. the universal dynamics are expected to satisfy a scaling symmetry of space and time with the crossing rate, inspired by the kibble-zurek mechanism. we ... | universal space-time scaling symmetry in the dynamics of bosons across a quantum phase transition |
recent work has shown that collective single photon emission from an ensemble of resonate two-level atoms, i.e., single photon superradiance, is a rich field of study. the present letter addresses the flip side of superradiance, i.e., subradiance. single photon subradiant states are potentially stable against collectiv... | single photon subradiance: quantum control of spontaneous emission and ultrafast readout |
out-of-time-order correlations (otocs) characterize the scrambling, or delocalization, of quantum information over all the degrees of freedom of a system and thus have been proposed as a proxy for chaos in quantum systems. recent experimental progress in measuring otocs calls for a more thorough understanding of how th... | relating out-of-time-order correlations to entanglement via multiple-quantum coherences |
we investigate the ultimate precision achievable in gaussian quantum metrology. we derive general analytical expressions for the quantum fisher information matrix and for the measurement compatibility condition, ensuring asymptotic saturability of the quantum cramér-rao bound, for the estimation of multiple parameters ... | multiparameter gaussian quantum metrology |
the quantum nonlinear regime of optomechanics is reached when nonlinear effects of the radiation pressure interaction are observed at the single-photon level. this requires couplings larger than the mechanical frequency and cavity-damping rate, and is difficult to achieve experimentally. here we show how to exponential... | enhanced nonlinear interactions in quantum optomechanics via mechanical amplification |
we derive an effective field theory for general chaotic two-dimensional conformal field theories with a large central charge. the theory is a specific and calculable instance of a more general framework recently proposed in [1]. we discuss the gauge symmetries of the model and how they relate to the lyapunov behaviour ... | effective field theory for chaotic cfts |
we demonstrate a simple and robust geometry for optical trapping in vacuum of a single nanoparticle based on a parabolic mirror and the optical gradient force, and we demonstrate rapid parametric feedback cooling of all three motional degrees of freedom from room temperature to a few mk. a single laser at 1550nm, and a... | parametric feedback cooling of levitated optomechanics in a parabolic mirror trap |
quantum image processing (qimp) is devoted to utilizing the quantum computing technologies to capture, manipulate, and recover quantum images in different formats and for different purposes. logically, percolating this requires that representations to encode images based on the quantum mechanical composition of any pot... | a survey of quantum image representations |
we show how a large family of interacting nonequilibrium phases of matter can arise from the presence of multiple time-translation symmetries, which occur by quasiperiodically driving an isolated, quantum many-body system with two or more incommensurate frequencies. these phases are fundamentally different from those r... | long-lived interacting phases of matter protected by multiple time-translation symmetries in quasiperiodically driven systems |
special quantum states are used in metrology to achieve sensitivities below the limits established by classically behaving states1,2. in bosonic interferometers, squeezed states3, number states4,5 and `schrödinger cat' states5 have been implemented on various platforms and have demonstrated improved measurement precisi... | quantum-enhanced sensing of a single-ion mechanical oscillator |
entanglement is central to studies in foundations of quantum mechanics, quantum information, and precision measurement. among the variety of multipartite entangled states, dicke states form an important class, and their realizations attract widespread interest. most of the dicke states produced to date are limited to p... | beating the classical precision limit with spin-1 dicke states of more than 10,000 atoms |
a novel approach based on the uhlmann curvature is introduced for the investigation of non-equilibrium steady-state quantum phase transitions (ness-qpts). equilibrium phase transitions fall invariably into two markedly non-overlapping categories: classical phase transitions and quantum phase transitions. ness-qpts offe... | uhlmann curvature in dissipative phase transitions |
entanglement, the existence of correlations in distant systems stronger than those allowed by classical physics, is one of the most astonishing features of quantum physics. by distributing entangled photon pairs over a 96-km-long submarine fiber, which is part of existing infrastructure carrying internet traffic, we de... | entanglement distribution over a 96-km-long submarine optical fiber |
we show that the onset of quantum chaos at infinite temperature in two many-body one-dimensional lattice models, the perturbed spin-1/2 xxz and anderson models, is characterized by universal behavior. specifically, we show that the onset of quantum chaos is marked by maxima of the typical fidelity susceptibilities that... | universality in the onset of quantum chaos in many-body systems |
entanglement of light and multiple vibrations is a key resource for multichannel quantum information processing and memory. however, entanglement generation is generally suppressed, or even fully destroyed, by the dark-mode (dm) effect induced by the coupling of multiple degenerate or near-degenerate vibrational modes ... | noise-tolerant optomechanical entanglement via synthetic magnetism |
ergodicity breaking and slow relaxation are intriguing aspects of nonequilibrium dynamics both in classical and quantum settings. these phenomena are typically associated with phase transitions, e.g., the emergence of metastable regimes near a first-order transition or scaling dynamics in the vicinity of critical point... | exponentially accelerated approach to stationarity in markovian open quantum systems through the mpemba effect |
using the density-matrix renormalization group method for the ground state and excitations of the shastry-sutherland spin model, we demonstrate the existence of a narrow quantum spin liquid phase between the previously known plaquette-singlet and antiferromagnetic states. our conclusions are based on the finite-size sc... | quantum criticality and spin liquid phase in the shastry-sutherland model |
we overview the concept of dynamical phase transitions (dpts) in isolated quantum systems quenched out of equilibrium. we focus on non-equilibrium transitions characterized by an order parameter, which features qualitatively distinct temporal behavior on the two sides of a certain dynamical critical point. dpts are cur... | dynamical phase transitions in the collisionless pre-thermal states of isolated quantum systems: theory and experiments |
as part of a programme to develop parton showers with controlled logarithmic accuracy, we consider the question of collinear spin correlations within the panscales family of parton showers. we adapt the well-known collins-knowles spin-correlation algorithm to panscales antenna and dipole showers, using an approach with... | spin correlations in final-state parton showers and jet observables |
we present an interpretation of scar states and quantum revivals as weakly "broken" representations of lie algebras spanned by a subset of eigenstates of a many-body quantum system. we show that the pxp model, describing strongly interacting rydberg atoms, supports a "loose" embedding of multiple su (2 ) lie algebras c... | quantum scars as embeddings of weakly broken lie algebra representations |
hybrid quantum/classical variational algorithms can be implemented on noisy intermediate-scale quantum computers and can be used to find solutions for combinatorial optimization problems. approaches discussed in the literature minimize the expectation of the problem hamiltonian for a parameterized trial quantum state. ... | improving variational quantum optimization using cvar |
the invention of scanning probe microscopy revolutionized the way electronic phenomena are visualized1. whereas present-day probes can access a variety of electronic properties at a single location in space2, a scanning microscope that can directly probe the quantum mechanical existence of an electron at several locati... | the quantum twisting microscope |
we present an implementation of the relativistic three-particle quantization condition including both s- and d-wave two-particle channels. for this, we develop a systematic expansion of the three-particle k matrix, k df,3, about threshold, which is the generalization of the effective range expansion of the two-particle... | implementing the three-particle quantization condition including higher partial waves |
we give a broad generalisation of the mapping, originally due to dennis, kitaev, landahl and preskill, from quantum error correcting codes to statistical mechanical models. we show how the mapping can be extended to arbitrary stabiliser or subsystem codes subject to correlated pauli noise models, including models of fa... | statistical mechanical models for quantum codes with correlated noise |
we study the symmetry resolved entanglement entropies in one-dimensional systems with boundaries. we provide some general results for conformal invariant theories and then move to a semi-infinite chain of free fermions. we consider both an interval starting from the boundary and away from it. we derive exact formulas f... | boundary effects on symmetry resolved entanglement |
strain is an effective method to tune the electronic properties of two-dimensional (2d) materials and can induce novel phase transition. recently, the 2d m a2z4 family of materials has attracted interest because of their emerging topological, magnetic, and superconducting properties. here, we investigate the impact of ... | strain effects on the topological and valley properties of the janus monolayer vsigen4 |
nuclear spins are highly coherent quantum objects. in large ensembles, their control and detection via magnetic resonance is widely exploited, for example, in chemistry, medicine, materials science and mining. nuclear spins also featured in early proposals for solid-state quantum computers1 and demonstrations of quantu... | coherent electrical control of a single high-spin nucleus in silicon |
we present a novel neural network architecture using self-attention, the wavefunction transformer (psiformer), which can be used as an approximation (or ansatz) for solving the many-electron schrödinger equation, the fundamental equation for quantum chemistry and material science. this equation can be solved from first... | a self-attention ansatz for ab-initio quantum chemistry |
we establish the foundations of a nonequilibrium theory of quantum thermodynamics for noninteracting open quantum systems strongly coupled to their reservoirs within the framework of the nonequilibrium green's functions. the energy of the system and its coupling to the reservoirs are controlled by a slow external time-... | quantum thermodynamics: a nonequilibrium green's function approach |
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