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practical quantum networks require low-loss and noise-resilient optical interconnects as well as non-gaussian resources for entanglement distillation and distributed quantum computation. the latter could be provided by superconducting circuits but existing solutions to interface the microwave and optical domains lack e... | converting microwave and telecom photons with a silicon photonic nanomechanical interface |
we investigate the quantumness of primordial cosmological fluctuations and its detectability. the quantum discord of inflationary perturbations is calculated for an arbitrary splitting of the system, and shown to be very large on super-hubble scales. this entails the presence of large quantum correlations, due to the e... | quantum discord of cosmic inflation: can we show that cmb anisotropies are of quantum-mechanical origin? |
origami and kirigami have emerged as potential tools for the design of mechanical metamaterials whose properties such as curvature, poisson ratio, and existence of metastable states can be tuned using purely geometric criteria. a major obstacle to exploiting this property is the scarcity of tools to identify and progra... | topological mechanics of origami and kirigami |
many intriguing phenomena occur for electrons under strong magnetic fields1,2. recently, it was shown that an appropriate strain texture in graphene could induce a synthetic gauge field3-6, in which electrons behave as they do in a real magnetic field7-11. this enabled the control of quantum transport by mechanical mea... | acoustic landau quantization and quantum-hall-like edge states |
precision measurement of nonlinear observables is an important goal in all facets of quantum optics. this allows measurement-based non-classical state preparation, which has been applied to great success in various physical systems, and provides a route for quantum information processing with otherwise linear interacti... | nonlinear optomechanical measurement of mechanical motion |
entanglement phase transitions in quantum chaotic systems subject to projective measurements and in random tensor networks have emerged as a new class of critical points separating phases with different entanglement scaling. we propose a mean-field theory of such transitions by studying the entanglement properties of r... | mean-field entanglement transitions in random tree tensor networks |
the 3d ising transition, the most celebrated and unsolved critical phenomenon in nature, has long been conjectured to have emergent conformal symmetry, similar to the case of the 2d ising transition. yet, the emergence of conformal invariance in the 3d ising transition has rarely been explored directly, mainly due to u... | uncovering conformal symmetry in the 3d ising transition: state-operator correspondence from a quantum fuzzy sphere regularization |
we generate translationally invariant systems exhibiting many-body localization from all-bands-flat single-particle lattice hamiltonians dressed with suitable short-range many-body interactions. this phenomenon, dubbed many-body flatband localization, is based on symmetries of both single-particle and interaction terms... | many-body flatband localization |
markovian reservoir engineering, in which time evolution of a quantum system is governed by a lindblad master equation, is a powerful technique in studies of quantum phases of matter and quantum information. it can be used to drive a quantum system to a desired (unique) steady state, which can be an exotic phase of mat... | geometry and response of lindbladians |
we present a full symmetry classification of fermion matter in and out of thermal equilibrium. our approach starts from first principles, the ten different classes of linear and antilinear state transformations in fermionic fock spaces, and symmetries defined via invariance properties of the dynamical equation for the ... | symmetry classes of open fermionic quantum matter |
we investigate the spectral and transport properties of many-body quantum systems with conserved charges and kinetic constraints. using random unitary circuits, we compute ensemble-averaged spectral form factors and linear-response correlation functions, and find that their characteristic timescales are given by the in... | subdiffusion and many-body quantum chaos with kinetic constraints |
in conformal field theory (cft), the four-point correlator is a fundamental object that encodes cft properties, constrains cft structures, and connects to the gravitational scattering amplitude in holography theory. however, the four-point correlator of cfts in dimensions higher than two-dimensional remains largely une... | conformal four-point correlators of the three-dimensional ising transition via the quantum fuzzy sphere |
synthetic gauge fields have recently emerged, arising in the context of quantum simulations, topological matter, and the protected transportation of excitations against defects. for example, an ultracold atom experiences a light-induced effective magnetic field when tunneling in an optical lattice, and offering a platf... | synthetic gauge fields in a single optomechanical resonator |
saturable absorption is a nonperturbative nonlinear optical phenomenon that plays a pivotal role in the generation of ultrafast light pulses. here we show that this effect emerges in graphene at unprecedentedly low light intensities, thus opening avenues to new nonlinear physics and applications in optical technology. ... | theory of graphene saturable absorption |
we propose an efficient optomechanical mass sensor operating at exceptional points (eps), non-hermitian degeneracies where eigenvalues of a system and their corresponding eigenvectors simultaneously coalesce. the benchmark system consists of two optomechanical cavities that are mechanically coupled, where we engineer m... | exceptional point enhances sensitivity of optomechanical mass sensors |
fractons are emergent particles which are immobile in isolation, but which can move together in dipolar pairs or other small clusters. these exotic excitations naturally occur in certain quantum phases of matter described by tensor gauge theories. previous research has focused on the properties of small numbers of frac... | emergent phases of fractonic matter |
the schrödinger-langevin equation (sle) is considered as an effective open quantum system formalism suitable for phenomenological applications involving a quantum subsystem interacting with a thermal bath. we focus on two open issues relative to its solutions: the stationarity of the excited states of the non-interacti... | the schrödinger-langevin equation with and without thermal fluctuations |
quantum nanodevices are fundamental systems in quantum thermodynamics that have been the subject of profound interest in recent years. among these, quantum batteries play a very important role. in this paper we lay down a theory of random quantum batteries and provide a systematic way of computing the average work and ... | random quantum batteries |
the realization of mixtures of excitons and charge carriers in van der waals materials presents a frontier for the study of the many-body physics of strongly interacting bose-fermi mixtures. in order to derive an effective low-energy model for such systems, we develop an exact diagonalization approach based on a discre... | theory of exciton-electron scattering in atomically thin semiconductors |
we derive exact results for the lindblad equation for a quantum spin chain (one-dimensional quantum compass model) with dephasing noise. the system possesses doubly degenerate nonequilibrium steady states due to the presence of a conserved charge commuting with the hamiltonian and lindblad operators. we show that the s... | dissipative spin chain as a non-hermitian kitaev ladder |
the existence of bound states in the continuum (bic) manifests a general wave phenomenon first predicted in quantum mechanics by john von neumann and eugene wigner [j. von neumann and e. wigner, phys. z. 30, 465 (1929)]. today it is being actively explored in photonics, radiophysics, acoustics, and hydrodynamics. we re... | experimental observation of a symmetry-protected bound state in the continuum in a chain of dielectric disks |
preface; notation; 1. historical introduction; 2. particle states in a central potential; 3. general principles of quantum mechanics; 4. spin; 5. approximations for energy eigenstates; 6. approximations for time-dependent problems; 7. potential scattering; 8. general scattering theory; 9. the canonical formalism; 10. c... | lectures on quantum mechanics |
quantum probes are atomic sized devices mapping information of their environment to quantum-mechanical states. by improving measurements and at the same time minimizing perturbation of the environment, they form a central asset for quantum technologies. we realize spin-based quantum probes by immersing individual cs at... | single-atom quantum probes for ultracold gases boosted by nonequilibrium spin dynamics |
we consider the logarithmic negativity and related quantities of time evolution operators. we study free fermion, compact boson, and holographic conformal field theories (cfts) as well as numerical simulations of random unitary circuits and integrable and chaotic spin chains. the holographic behavior strongly deviates ... | quantum vs. classical information: operator negativity as a probe of scrambling |
the simulation of real-time dynamics in lattice gauge theories is particularly hard for classical computing due to the exponential scaling of the required resources. on the other hand, quantum algorithms can potentially perform the same calculation with a polynomial dependence on the number of degrees of freedom. a pre... | toward scalable simulations of lattice gauge theories on quantum computers |
to observe the dynamical casimir effect (dce) induced by a moving mirror is a long-standing challenge because the mirror velocity needs to approach the speed of light. here, we present an experimentally feasible method for observing this mechanical dce in an optomechanical system. it employs a detuned, parametric drivi... | emission of photon pairs by mechanical stimulation of the squeezed vacuum |
in this paper i report a pedagogical derivation of the unconventional electronic hydrodynamics in graphene on the basis of the kinetic theory. while formally valid in the weak coupling limit, this approach allows one to derive the unconventional hydrodynamics in the system which is neither galilean- nor lorentz-invaria... | electronic hydrodynamics in graphene |
in this paper, we explore properties of pseudoentropy in quantum field theories and spin systems from several approaches. pseudoentropy is a generalization of entanglement entropy such that it depends on both an initial and final state and has a clear gravity dual via the ads/cft. we numerically analyze a class of free... | aspects of pseudoentropy in field theories |
quantum phase transitions are usually observed in ground states of correlated systems. remarkably, eigenstate phase transitions can also occur at finite energy density in disordered, isolated quantum systems. such transitions fall outside the framework of statistical mechanics as they involve the breakdown of ergodicit... | finite-size scaling of many-body localization phase transitions |
in quantum field theory, the decay of an extended metastable state into the real ground state is known as ``false vacuum decay'' and it takes place via the nucleation of spatially localized bubbles. despite the large theoretical effort to estimate the nucleation rate, experimental observations were still missing. here,... | observation of false vacuum decay via bubble formation in ferromagnetic superfluids |
the dynamical phase diagram of interacting disordered systems has seen substantial revision over the past few years. theory must now account for a large prethermal many-body localized regime in which thermalization is extremely slow, but not completely arrested. we derive a quantitative description of these dynamics in... | phenomenology of the prethermal many-body localized regime |
we propose and demonstrate purely optical feedback cooling of neutral nanoparticles in an optical lattice to an occupation number of 0.85 ± 0.20. the cooling force is derived from the optical gradients of displaced optical lattices produced with two sidebands on the trapping laser. to achieve highly accurate position o... | optical cold damping of neutral nanoparticles near the ground state in an optical lattice |
we propose a novel machine learning method for sampling from the high-dimensional probability distributions of lattice field theories, which is based on a single neural ode layer and incorporates the full symmetries of the problem. we test our model on the \phi^4ϕ4 theory, showing that it systematically outperforms pre... | learning lattice quantum field theories with equivariant continuous flows |
quantum field theory in zero spatial dimensions has a rich infrared landscape and a universal ultraviolet, inverting the usual wilsonian paradigm. for holographic theories this implies a rich landscape of asymptotically ads2 geometries. isolating the interiors of these spacetimes suggests a study of the analog of the t... | t t ¯ in ads2 and quantum mechanics |
a pure quantum state can fully describe thermal equilibrium as long as one focuses on local observables. the thermodynamic entropy can also be recovered as the entanglement entropy of small subsystems. when the size of the subsystem increases, however, quantum correlations break the correspondence and mandate a correct... | universality in volume-law entanglement of scrambled pure quantum states |
we show how to build a multiscale entanglement renormalization ansatz (mera) representation of the ground state of a many-body hamiltonian h by applying the recently proposed tensor network renormalization [g. evenbly and g. vidal, phys. rev. lett. 115, 180405 (2015)] to the euclidean time evolution operator e-β h for ... | tensor network renormalization yields the multiscale entanglement renormalization ansatz |
universal quantum computing requires nonstabilizer (magic) quantum states. quantifying the nonstabilizerness and relating it to other quantum resources is vital for characterizing the complexity of quantum many-body systems. in this work, we prove that a quantum state is a stabilizer if and only if all states belonging... | measuring nonstabilizerness via multifractal flatness |
we study the problem of observing quantum collective phenomena emerging from large numbers of measurements. these phenomena are difficult to observe in conventional experiments because, in order to distinguish the effects of measurement from dephasing, it is necessary to post-select on sets of measurement outcomes whos... | probing post-measurement entanglement without post-selection |
unlike the rydberg blockade regime, the rydberg antiblockade regime (rabr) allows more than one rydberg atom to be excited, which can bring other interesting phenomena and applications. we propose an alternative scheme to quickly achieve the rabr. the proposed rabr can be implemented by adjusting the detuning of the cl... | fast rydberg antiblockade regime and its applications in quantum logic gates |
we consider the out-of-equilibrium dynamics of an interacting integrable system in the presence of an external dephasing noise. in the limit of large spatial correlation of the noise, we develop an exact description of the dynamics of the system based on a hydrodynamic formulation. this results in an additional term to... | generalized hydrodynamics with dephasing noise |
with the discovery of p t ?-symmetric quantum mechanics, it was shown that even non-hermitian systems may exhibit entirely real eigenvalue spectra. this finding did not only change the perception of quantum mechanics itself, it also significantly influenced the field of photonics. by appropriately designing one-dimensi... | demonstration of a two-dimensional p t ?-symmetric crystal |
we consider the brownian syk model of n interacting majorana fermions, with random couplings that are taken to vary independently at each time. we study the out-of-time-ordered correlators (otocs) of arbitrary observables and the rényi-2 tripartite information of the unitary evolution operator, which were proposed as d... | quantum chaos in the brownian syk model with large finite n : otocs and tripartite information |
we use the fundamental nonequilibrium steady-state fluctuation symmetry and derive a condition on the validity of the thermodynamic uncertainty relation (tur) in thermal transport problems, classical and quantum alike. we test this condition and study the breakdown of the tur in different thermal transport junctions of... | thermodynamic uncertainty relation in thermal transport |
in recent decades, scientists have developed the means to engineer synthetic periodic arrays with feature sizes below the wavelength of light. when such features are appropriately structured, electromagnetic radiation can be manipulated in unusual ways, resulting in optical metamaterials whose function is directly cont... | electron quantum metamaterials in van der waals heterostructures |
the dissipation generated during a quasistatic thermodynamic process can be characterised by introducing a metric on the space of gibbs states, in such a way that minimally-dissipating protocols correspond to geodesic trajectories. here, we show how to generalize this approach to open quantum systems by finding the the... | thermodynamic length in open quantum systems |
recent studies of interacting systems of quantum spins, ultracold atoms and correlated fermions have shed a new light on how isolated many-body systems can avoid rapid equilibration to their thermal state. it has been shown that many such systems can "weakly" break ergodicity: they possess a small number of non-thermal... | weak ergodicity breaking through the lens of quantum entanglement |
thermodynamics at the nanoscale is known to differ significantly from its familiar macroscopic counterpart: the possibility of state transitions is not determined by free energy alone but by an infinite family of free-energy-like quantities; strong fluctuations (possibly of quantum origin) allow one to extract less wor... | correlating thermal machines and the second law at the nanoscale |
multifractal dimensions allow for characterizing the localization properties of states in complex quantum systems. for ergodic states the finite-size versions of fractal dimensions converge to unity in the limit of large system size. however, the approach to the limiting behavior is remarkably slow. thus, an understand... | multifractal dimensions for random matrices, chaotic quantum maps, and many-body systems |
the greenberger-horne-zeilinger (ghz) entanglement, originally introduced to uncover the extreme violation of local realism against quantum mechanics, is an important resource for multiparty quantum communication tasks. but the low intensity and fragility of the ghz entanglement source in current conditions have made t... | long-distance measurement-device-independent multiparty quantum communication |
we show that out-of-time-order correlators (otocs) constitute a probe for local-operator entanglement (loe). there is strong evidence that a volumetric growth of loe is a faithful dynamical indicator of quantum chaos, while otoc decay corresponds to operator scrambling, often conflated with chaos. we show that rapid ot... | scrambling is necessary but not sufficient for chaos |
open quantum systems have been shown to host a plethora of exotic dynamical phases. measurement-induced entanglement phase transitions in monitored quantum systems are a striking example of this phenomena. however, naive realizations of such phase transitions requires an exponential number of repetitions of the experim... | neural-network decoders for measurement induced phase transitions |
we derive the quantum master equations for heavy quark systems in a high-temperature quark-gluon plasma in the lindblad form. the master equations are derived in the influence functional formalism for open quantum systems in perturbation theory. these master equations have a wide range of applications, such as decohere... | heavy quark master equations in the lindblad form at high temperatures |
the laws of quantum mechanics allow for the distribution of a secret random key between two parties. here we analyse the security of a protocol for establishing a common secret key between n parties (i.e. a conference key), using resource states with genuine n-partite entanglement. we compare this protocol to conferenc... | multi-partite entanglement can speed up quantum key distribution in networks |
levitated nanoparticles and microparticles are excellent candidates for the realization of extremely isolated mechanical systems, with a huge potential impact in sensing applications and in quantum physics. magnetic levitation based on static fields is a particularly interesting approach, owing to the unique property o... | ultralow mechanical damping with meissner-levitated ferromagnetic microparticles |
the hybrid microwave optomechanical-magnetic system has recently emerged as a promising candidate for coherent information processing because of the ultrastrong microwave photon-magnon coupling and the long life of the magnon and phonon. as a quantum information processing device, the realization of single excitation h... | simultaneous blockade of a photon, phonon, and magnon induced by a two-level atom |
it is customary to couple a quantum system to external classical fields. one application is to couple the global symmetries of the system (including the poincaré symmetry) to background gauge fields (and a metric for the poincaré symmetry). failure of gauge invariance of the partition function under gauge transformatio... | anomalies in the space of coupling constants and their dynamical applications i |
we establish a theoretical method which goes beyond the weak-coupling and markovian approximations while remaining intuitive, using a quantum master equation in a larger hilbert space. the method is applicable to all impurity hamiltonians tunnel coupled to one (or multiple) baths of free fermions. the accuracy of the m... | fermionic reaction coordinates and their application to an autonomous maxwell demon in the strong-coupling regime |
we study the statistics of work, dissipation, and entropy production of a quantum quasi-isothermal process, where the system remains close to thermal equilibrium along the transformation. we derive a general analytic expression for the work distribution and the cumulant generating function. all work cumulants split int... | quantum work statistics close to equilibrium |
the theory of quantum scarring—a remarkable violation of quantum unique ergodicity—rests on two complementary pillars: the existence of unstable classical periodic orbits and the so-called quasimodes, i.e., the nonergodic states that strongly overlap with a small number of the system's eigenstates. recently, interest i... | correspondence principle for many-body scars in ultracold rydberg atoms |
these notes, based on lectures given at various schools over the last few years, aim to provide an introduction to entanglement entropies in quantum field theories, including holographic ones. we explore basic properties and simple examples of entanglement entropies, mostly in two dimensions, with an emphasis on physic... | lectures on entanglement entropy in field theory and holography |
we present the results of a conformal bootstrap study of the presumed unitary ir fixed point of quantum electrodynamics in three dimensions (qed3) coupled to nf=4 two-component dirac fermions. specifically, we study the four-point correlators of the s u (4 ) adjoint fermion bilinear r and the monopole of lowest topolog... | bootstrapping nf=4 conformal qed3 |
quantum thermalization is well understood via the eigenstate thermalization hypothesis (eth). the general form of eth, describing all the relevant correlations of matrix elements, may be derived on the basis of a "typicality" argument of invariance with respect to local rotations involving nearby energy levels. in this... | eigenstate thermalization hypothesis and free probability |
in quantum magnetism, the virtual exchange of particles mediates an interaction between spins. here, we show that an inelastic hubbard interaction fundamentally alters the magnetism of the hubbard model due to dissipation in spin-exchange processes, leading to sign reversal of magnetic correlations in dissipative quant... | dynamical sign reversal of magnetic correlations in dissipative hubbard models |
we present a theoretical demonstration on the generation of entangled coherent states and of coherent state superpositions, with photon numbers and frequencies orders of magnitude higher than those provided by the current technology. this is achieved by utilizing a quantum mechanical multimode description of the single... | high photon number entangled states and coherent state superposition from the extreme ultraviolet to the far infrared |
we study the anderson transition on a generic model of random graphs with a tunable branching parameter 1 <k <2 , through large scale numerical simulations and finite-size scaling analysis. we find that a single transition separates a localized phase from an unusual delocalized phase that is ergodic at large scal... | scaling theory of the anderson transition in random graphs: ergodicity and universality |
we report the experimental measurement of the equation of state of a two-dimensional fermi gas with attractive s -wave interactions throughout the crossover from a weakly coupled fermi gas to a bose gas of tightly bound dimers as the interaction strength is varied. we demonstrate that interactions lead to a renormaliza... | equation of state of ultracold fermions in the 2d bec-bcs crossover region |
determining the best method for training a machine learning algorithm is critical to maximizing its ability to classify data. in this paper, we compare the standard "fully supervised" approach (which relies on knowledge of event-by-event truth-level labels) with a recent proposal that instead utilizes class ratios as t... | (machine) learning to do more with less |
generative modeling using samples drawn from the probability distribution constitutes a powerful approach for unsupervised machine learning. quantum mechanical systems can produce probability distributions that exhibit quantum correlations which are difficult to capture using classical models. we show theoretically tha... | enhancing generative models via quantum correlations |
the eigenstate-thermalization-hypothesis (eth) has been established as the general framework to understand quantum statistical mechanics. only recently has the attention been paid to so-called general eth, which accounts for higher-order correlations among matrix elements, and that can be rationalized theoretically usi... | general eigenstate thermalization via free cumulants in quantum lattice systems |
the lack of knowledge about the detailed many-particle motion on the microscopic scale is a key issue in any theoretical description of a macroscopic experiment. for systems at or close to thermal equilibrium, statistical mechanics provides a very successful general framework to cope with this problem. however, far fro... | typical fast thermalization processes in closed many-body systems |
the study of entanglement in the symmetry sectors of a theory has recently attracted a lot of attention since it provides better understanding of some aspects of quantum many-body systems. in this paper, we extend this analysis to the case of non-hermitian models, in which the reduced density matrix ρa may be nonpositi... | symmetry-resolved entanglement in critical non-hermitian systems |
the entanglement spectrum of the reduced density matrix contains information beyond the von neumann entropy and provides unique insights into exotic orders or critical behavior of quantum systems. here, we show that strongly disordered systems in the many-body localized phase have power-law entanglement spectra, arisin... | power-law entanglement spectrum in many-body localized phases |
a simple probe of chaos and operator growth in many-body quantum systems is the out of time ordered four point function. in a large class of local systems, the effects of chaos in this correlator build up exponentially fast inside the so called butterfly cone. it has been previously observed that the growth of these ef... | chaos in the butterfly cone |
a theory of time-delayed coherent quantum feedback is developed. more specifically, we consider a quantum system coupled to a bosonic reservoir creating a unidirectional feedback loop. it is shown that the dynamics can be mapped onto a fictitious series of cascaded quantum systems, where the system is driven by past ve... | time-delayed quantum feedback control |
in this paper we present the null string origin of the ambitwistor string. classically, the null string is the tensionless limit of string theory, and so too is the ambitwistor string. both have as constraint algebra the galilean conformal algebra in two dimensions. but something interesting happens in the quantum theo... | on the null origin of the ambitwistor string |
facts happen at every interaction, but they are not absolute: they are relative to the systems involved in the interaction. stable facts are those whose relativity can effectively be ignored. in this work, we describe how stable facts emerge in a world of relative facts and discuss their respective roles in connecting ... | stable facts, relative facts |
we study the dynamics of entanglement in the quantum ising chain with dephasing dissipation in a lindblad master equation form. we consider two unravelings which preserve the gaussian form of the state, allowing us to address large system sizes. the first unraveling gives rise to a quantum-state-diffusion dynamics, whi... | entanglement transitions in the quantum ising chain: a comparison between different unravelings of the same lindbladian |
local master equations are a widespread tool to model open quantum systems, especially in the context of many-body systems. these equations, however, are believed to lead to thermodynamic anomalies and violation of the laws of thermodynamics. in contrast, here we rigorously prove that local master equations are consist... | quantum thermodynamically consistent local master equations |
probing quantum mechanics and quantum aspects of general relativity, along with the sensing and constraining of classical gravity, can all be enabled by unprecedented spatial sizes of superpositions of massive objects. in this paper, we show that there is a feasible setup sourced by realizable magnetic field gradients ... | constructing nano-object quantum superpositions with a stern-gerlach interferometer |
we explore a class of random tensor network models with "stabilizer" local tensors which we name random stabilizer tensor networks (rstns). for rstns defined on a two-dimensional square lattice, we perform extensive numerical studies of entanglement phase transitions between volume-law and area-law entangled phases of ... | entanglement phase transitions in random stabilizer tensor networks |
a fundamental and intrinsic property of any device or natural system is its relaxation time τrelax, which is the time it takes to return to equilibrium after the sudden change of a control parameter. reducing τrelax is frequently necessary, and is often obtained by a complex feedback process. to overcome the limitation... | engineered swift equilibration of a brownian particle |
correlations between different regions of a quantum many-body system can be quantified through measures based on entropies of (reduced) subsystem states. for closed systems, several analytical and numerical tools, e.g., hydrodynamic theories or tensor networks, can accurately capture the time evolution of subsystem ent... | dissipative quasiparticle picture for quadratic markovian open quantum systems |
bound states in the continuum (bics) have been extensively studied in various systems since they are first proposed in quantum mechanics. photonic bics can enable optical mode confinement and provide field enhancement for nonlinear optics, but they have rarely been explored in nonlinear integrated photonic waveguides. ... | second-harmonic generation in etchless lithium niobate nanophotonic waveguides with bound states in the continuum |
self-organized criticality is an elegant explanation of how complex structures emerge and persist throughout nature1, and why such structures often exhibit similar scale-invariant properties2-9. although self-organized criticality is sometimes captured by simple models that feature a critical point as an attractor for ... | signatures of self-organized criticality in an ultracold atomic gas |
the existence of fundamentally identical particles represents a foundational distinction between classical and quantum mechanics. because of their exchange symmetry, identical particles can appear to be entangled—another uniquely quantum phenomenon with far-reaching practical implications. however, a long-standing deba... | entanglement between identical particles is a useful and consistent resource |
we investigate the phenomenon of gravity-induced entanglement in optomechanical systems. assuming photon number conservation and the newtonian potential expanded up to the quadratic order of the oscillator positions, we exactly solve the dynamics of the optomehcanical systems. then, we find that the phase difference du... | gravity-induced entanglement in optomechanical systems |
we derive an explicit mapping between the spectra of conserved local operators of integrable quantum lattice models and the density distributions of their thermodynamic particle content. this is presented explicitly for the heisenberg xxz spin chain. as an application we discuss a quantum quench scenario, in both the g... | string-charge duality in integrable lattice models |
in this review, we survey the latest advances in theoretical understanding of bimolecular reaction dynamics in the past decade. the remarkable recent progress in this field has been driven by more accurate and efficient ab initio electronic structure theory, effective potential-energy surface fitting techniques, and no... | recent advances in quantum dynamics of bimolecular reactions |
in a wide range of quantum theoretical settings—from quantum mechanics to quantum field theory, from gauge theory to string theory—singularities in the complex borel plane, usually associated to instantons or renormalons, render perturbation theory ill-defined as they give rise to nonperturbative ambiguities. these amb... | nonperturbative ambiguities and the reality of resurgent transseries |
the scientific method relies on facts, established through repeated measurements and agreed upon universally, independently of who observed them. in quantum mechanics, the objectivity of observations is not so clear, most dramatically exposed in eugene wigner's eponymous thought experiment where two observers can exper... | experimental test of local observer independence |
while the enhancement of spin-space symmetry from the usual su(2) to su (n ) is promising for finding nontrivial quantum spin liquids, its realization in magnetic materials remains challenging. here, we propose a new mechanism by which su(4) symmetry emerges in the strong spin-orbit coupling limit. in d1 transition met... | emergent su (4 ) symmetry in α -zrcl3 and crystalline spin-orbital liquids |
in this article we derive a measure of quantumness in quantum multi-parameter estimation problems. we can show that the ratio between the mean uhlmann curvature and the fisher information provides a figure of merit which estimates the amount of incompatibility arising from the quantum nature of the underlying physical ... | on quantumness in multi-parameter quantum estimation |
we investigate the eigenstate thermalization hypothesis (eth) in integrable models, focusing on the spin-1/2 isotropic heisenberg (x x x ) chain. we provide numerical evidence that the eth holds for typical eigenstates (weak eth scenario). specifically, using a numerical implementation of state-of-the-art bethe ansatz ... | eigenstate thermalization hypothesis and integrability in quantum spin chains |
the entanglement entropy (ee) of the ground state of a one-dimensional hamiltonian at criticality has a universal logarithmic scaling with a prefactor given by the central charge c of the underlying (1 +1 ) -dimensional conformal field theory. when the system is probed by measurements, the entanglement in the critical ... | entanglement in a one-dimensional critical state after measurements |
the out-of-time-ordered correlator has been proposed as an indicator of chaos in quantum systems due to its simple interpretation in the semiclassical limit. in particular, its rate of possible exponential growth at ℏ →0 is closely related to the classical lyapunov exponent. here we explore how this approach to quantum... | universal level statistics of the out-of-time-ordered operator |
adiabatic state engineering is a powerful technique in quantum information and quantum control. however, its performance is limited by the adiabatic theorem of quantum mechanics. in this scenario, shortcuts to adiabaticity, such as provided by the superadiabatic theory, constitute a valuable tool to speed up the adiaba... | superadiabatic controlled evolutions and universal quantum computation |
we systematically investigate scrambling (or delocalizing) processes of quantum information encoded in quantum many-body systems by using numerical exact diagonalization. as a measure of scrambling, we adopt the tripartite mutual information (tmi) that becomes negative when quantum information is delocalized. we clarif... | scrambling of quantum information in quantum many-body systems |
quantum coherence is a useful resource for increasing the speed and decreasing the irreversibility of quantum dynamics. because of this feature, coherence is used to enhance the performance of various quantum information processing devices beyond the limitations set by classical mechanics. however, when we consider the... | superconducting-like heat current: effective cancellation of current-dissipation trade-off by quantum coherence |
string breaking is a central dynamical process in theories featuring confinement, where a string connecting two charges decays at the expense of the creation of new particle-antiparticle pairs. here, we show that this process can also be observed in quantum ising chains where domain walls get confined either by a symme... | real-time dynamics of string breaking in quantum spin chains |
quantum physics revolutionized classical disciplines of mechanics, statistical physics, and electrodynamics. one branch of scientific knowledge however seems untouched: thermodynamics. major motivation behind thermodynamics is to develop efficient heat engines. technology has a trend to miniaturize engines, reaching to... | superradiant quantum heat engine |
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