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we review and examine in detail recent developments regarding the question of the nucleon mass decomposition. we discuss in particular the virial theorem in quantum field theory and its implications for the nucleon mass decomposition and mechanical equilibrium. we reconsider the renormalization of the qcd energy-moment... | energy-momentum tensor in qcd: nucleon mass decomposition and mechanical equilibrium |
long-lived excited states of interacting quantum systems that retain quantum correlations and evade thermalization are of great fundamental interest. we create nonthermal states in a bosonic one-dimensional (1d) quantum gas of dysprosium by stabilizing a super-tonks-girardeau gas against collapse and thermalization wit... | topological pumping of a 1d dipolar gas into strongly correlated prethermal states |
the a.c. josephson effect predicted in 19621 and observed experimentally in 19632 as quantized `voltage steps' (the shapiro steps) from photon-assisted tunnelling of cooper pairs is among the most fundamental phenomena of quantum mechanics and is vital for metrological quantum voltage standards. the physically dual eff... | quantized current steps due to the a.c. coherent quantum phase-slip effect |
deformable full-colour light-emitting diodes with ultrafine pixels are essential for wearable electronics, which requires the conformal integration on curvilinear surface as well as retina-like high-definition displays. however, there are remaining challenges in terms of polychromatic configuration, electroluminescence... | wearable red-green-blue quantum dot light-emitting diode array using high-resolution intaglio transfer printing |
we consider line defects with large quantum numbers in conformal field theories. first, we consider spin impurities, both for a free scalar triplet and in the wilson-fisher o(3) model. for the free scalar triplet, we find a rich phase diagram that includes a perturbative fixed point, a new nonperturbative fixed point, ... | spin impurities, wilson lines and semiclassics |
quantum phase transitions are characterized by a dramatic change of the ground-state behavior; famous examples include the appearance of magnetic order or superconductivity as a function of doping in cuprates. in this work, we explore how a system dynamically crosses such a transition and in particular, investigate in ... | emergence of coherence and the dynamics of quantum phase transitions |
we rigorously examine, in generality, the ergodic properties of quantum lattice models with short range interactions, in the c∗ algebra formulation of statistical mechanics. ergodicity results, in the context of group actions on c∗ algebras, assume that the algebra is asymptotically abelian, which is not generically th... | almost everywhere ergodicity in quantum lattice models |
various measures have been suggested recently for quantifying the coherence of a quantum state with respect to a given basis. we first use two of these, the l1-norm and relative entropy measures, to investigate tradeoffs between the coherences of mutually unbiased bases. results include relations between coherence, unc... | complementarity relations for quantum coherence |
the atomic nucleus is one of the densest and most complex quantum-mechanical systems in nature. nuclei account for nearly all the mass of the visible universe. the properties of individual nucleons (protons and neutrons) in nuclei can be probed by scattering a high-energy particle from the nucleus and detecting this pa... | probing high-momentum protons and neutrons in neutron-rich nuclei |
recent experimental and theoretical works have made much progress toward understanding nonequilibrium phenomena in thermalizing systems, which act as thermal baths for their small subsystems, and many-body localized systems, which fail to do so. the description of time evolution in many-body systems is generally challe... | influence matrix approach to many-body floquet dynamics |
photosynthesis is the natural process that converts solar photons into energy-rich products that are needed to drive the biochemistry of life. two ultrafast processes form the basis of photosynthesis: excitation energy transfer and charge separation. under optimal conditions, every photon that is absorbed is used by th... | quantum design of photosynthesis for bio-inspired solar-energy conversion |
we obtain the ultimate quantum limit for estimating the transverse separation of two thermal point sources using a given imaging system with limited spatial bandwidth. we show via the quantum cramér-rao bound that, contrary to the rayleigh limit in conventional direct imaging, quantum mechanics does not mandate any los... | far-field superresolution of thermal electromagnetic sources at the quantum limit |
hellerman et al. (arxiv:1505.01537) have shown that in a generic cft the spectrum of operators carrying a large u(1) charge can be analyzed semiclassically in an expansion in inverse powers of the charge. the key is the operator state correspondence by which such operators are associated with a finite density superflui... | semiclassics, goldstone bosons and cft data |
in this paper, we apply machine learning methods to study phase transitions in certain statistical mechanical models on the two-dimensional lattices, whose transitions involve nonlocal or topological properties, including site and bond percolations, the x y model, and the generalized x y model. we find that using just ... | machine learning of phase transitions in the percolation and x y models |
coherent upconversion of terahertz and mid-infrared signals into visible light opens new horizons for spectroscopy, imaging, and sensing but represents a challenge for conventional nonlinear optics. here, we used a plasmonic nanocavity hosting a few hundred molecules to demonstrate optomechanical transduction of submic... | continuous-wave frequency upconversion with a molecular optomechanical nanocavity |
we study the thermal evolution of a highly spin-imbalanced, homogeneous fermi gas with unitarity limited interactions, from a fermi liquid of polarons at low temperatures to a classical boltzmann gas at high temperatures. radio-frequency spectroscopy gives access to the energy, lifetime, and short-range correlations of... | boiling a unitary fermi liquid |
in contrast to the fractional quantum hall (fqh) effect, where electron density fixes the applied magnetic field, fractional chern insulators (fcis) can realize fqh states in comparatively weak or even zero magnetic fields. previous theoretical work highlighted magic angle graphene as a promising fci platform, satisfyi... | field-tuned and zero-field fractional chern insulators in magic angle graphene |
we consider the problem of the decomposition of the rényi entanglement entropies in theories with a non-abelian symmetry by doing a thorough analysis of wess-zumino-witten (wzw) models. we first consider su(2)k as a case study and then generalise to an arbitrary non-abelian lie group. we find that at leading order in t... | symmetry-resolved entanglement entropy in wess-zumino-witten models |
we address the nature of spin dynamics in various integrable and nonintegrable, isotropic and anisotropic quantum spin-s chains, beyond the paradigmatic s =1 /2 heisenberg model. in particular, we investigate the algebraic long-time decay ∝t-1 /z of the spin-spin correlation function at infinite temperature, using stat... | universal spin dynamics in infinite-temperature one-dimensional quantum magnets |
confinement of excitations induces quasilocalized dynamics in disorder-free isolated quantum many-body systems in one spatial dimension. this occurrence is signaled by severe suppression of quantum correlation spreading and of entanglement growth, long-time persistence of spatial inhomogeneities, and long-lived coheren... | quasilocalized dynamics from confinement of quantum excitations |
the attempt to gain a theoretical understanding of the concept of time in quantum mechanics has triggered significant progress towards the search for faster and more efficient quantum technologies. one of such advances consists in the interpretation of the time-energy uncertainty relations as lower bounds for the minim... | generalized geometric quantum speed limits |
even the most sophisticated artificial neural networks are built by aggregating substantially identical units called neurons. a neuron receives multiple signals, internally combines them, and applies a non-linear function to the resulting weighted sum. several attempts to generalize neurons to the quantum regime have b... | quantum neuron: an elementary building block for machine learning on quantum computers |
we provide a holographic perspective on correlation functions in schwarzian quantum mechanics, as boundary-anchored wilson line correlators in jackiw-teitelboim gravity. we first study compact groups and identify the diagrammatic representation of bilocal correlators of the particle-on-a-group model as wilson line corr... | the schwarzian theory — a wilson line perspective |
we derive a thermodynamic uncertainty relation for general open quantum dynamics, described by a joint unitary evolution on a composite system comprising a system and an environment. by measuring the environmental state after the system-environment interaction, we bound the counting observables in the environment by th... | thermodynamic uncertainty relation for general open quantum systems |
mnb i2t e4 was recently suggested as the first example of an antiferromagnetic topological insulator. however, lacking good quality of single crystals hindered its further investigation. here, we report the detailed transport properties of several mnb i2t e4 thin flakes in which samples are more homogeneous as compared... | transport properties of thin flakes of the antiferromagnetic topological insulator mnb i2t e4 |
we explore both pure and mixed state floquet dynamical quantum phase transitions (fdqfts) in the one-dimensional p -wave superconductor with a time-driven pairing phase. in the fourier space the model is recast to the noninteracting quasispins subjected to a time-dependent effective magnetic field. we show that fdqfts ... | floquet dynamical phase transition and entanglement spectrum |
the coherent manipulation of spin and pseudospin underlies existing and emerging quantum technologies, including quantum communication and quantum computation. valley polarization, associated with the occupancy of degenerate, but quantum mechanically distinct valleys in momentum space, closely resembles spin polarizati... | optical manipulation of valley pseudospin |
an important result in classical stochastic thermodynamics is the work fluctuation-dissipation relation (fdr), which states that the dissipated work done along a slow process is proportional to the resulting work fluctuations. we show that slowly driven quantum systems violate this fdr whenever quantum coherence is gen... | work fluctuations in slow processes: quantum signatures and optimal control |
instanton partition functions of 5d gauge theories are witten indices for the adhm gauged quantum mechanics with (0, 4) susy. we derive the integral contour prescriptions for these indices using the jeffrey-kirwan method, for gauge theories with hypermultiplets in various representations. the results can be used to stu... | general instanton counting and 5d scft |
a major signature of quantum mechanics beyond classical physics is coherence, the existence of superposition states. the recently developed resource theory of quantum coherence allows the formalization of incoherent operations—those operations which cannot create coherence. we identify the set of operations which addit... | quantum processes which do not use coherence |
we introduce a novel approach to model heat transport in solids, based on the green-kubo theory of linear response. it naturally bridges the boltzmann kinetic approach in crystals and the allen-feldman model in glasses, leveraging interatomic force constants and normal-mode linewidths computed at mechanical equilibrium... | modeling heat transport in crystals and glasses from a unified lattice-dynamical approach |
we propose a method to study the thermodynamic behaviour of small systems beyond the weak coupling and markovian approximation, which is different in spirit from conventional approaches. the idea is to redefine the system and environment such that the effective, redefined system is again coupled weakly to markovian res... | nonequilibrium thermodynamics in the strong coupling and non-markovian regime based on a reaction coordinate mapping |
the allotropes of boron continue to challenge structural elucidation and solid-state theory. here we use machine learning combined with random structure searching (rss) algorithms to systematically construct an interatomic potential for boron. starting from ensembles of randomized atomic configurations, we use alternat... | data-driven learning of total and local energies in elemental boron |
we explore some consequences of the crossing symmetry for defect conformal field theories, focusing on codimension one defects like flat boundaries or interfaces. we study surface transitions of the 3d ising and other o( n ) models through numerical solutions to the crossing equations with the method of determinants. i... | boundary and interface cfts from the conformal bootstrap |
in this paper we continue the program initiated in part i, that is the study of entanglement measures in the sine-gordon model. in both parts, we have focussed on one specific technique, that is the well-known connection between branch point twist field correlators and measures of entanglement in 1+1d integrable quantu... | branch point twist field form factors in the sine-gordon model ii: composite twist fields and symmetry resolved entanglement |
a dynamical quantum phase transition can occur during time evolution of sudden quenched quantum systems across a phase transition. it corresponds to the nonanalytic behavior at a critical time of the rate function of the quantum-state return amplitude, analogous to nonanalyticity of the free-energy density at the criti... | observation of a dynamical quantum phase transition by a superconducting qubit simulation |
revealing universal behaviours is a hallmark of statistical physics. phenomena such as the stochastic growth of crystalline surfaces1 and of interfaces in bacterial colonies2, and spin transport in quantum magnets3-6 all belong to the same universality class, despite the great plurality of physical mechanisms they invo... | kardar-parisi-zhang universality in a one-dimensional polariton condensate |
the relaxation of few-body quantum systems can strongly depend on the initial state when the system's semiclassical phase space is mixed; i.e., regions of chaotic motion coexist with regular islands. in recent years, there has been much effort to understand the process of thermalization in strongly interacting quantum ... | slow quantum thermalization and many-body revivals from mixed phase space |
we discuss a supersymmetric generalization of the sachdev-ye-kitaev (syk) model. these are quantum mechanical models involving n majorana fermions. the supercharge is given by a polynomial expression in terms of the majorana fermions with random coefficients. the hamiltonian is the square of the supercharge. the n =1 m... | supersymmetric sachdev-ye-kitaev models |
counterdiabatic driving (cd) exploits auxiliary control fields to tailor the nonequilibrium dynamics of a quantum system, making possible the suppression of dissipated work in finite-time thermodynamics and the engineering of optimal thermal machines with no friction. we show that while the mean work done by the auxili... | universal work fluctuations during shortcuts to adiabaticity by counterdiabatic driving |
it is widely recognized that entanglement generation and dynamical chaos are intimately related in semiclassical models via the process of decoherence. in this paper, we propose a unifying framework which directly connects the bipartite and multipartite entanglement growth to the quantifiers of classical and quantum ch... | bridging entanglement dynamics and chaos in semiclassical systems |
the resonant enhancement of both mechanical and optical response in microcavity optomechanical devices allows exquisitely sensitive measurements of stimuli such as acceleration, mass and magnetic fields. in this work, we show that quantum correlated light can improve the performance of such sensors, increasing both the... | quantum enhanced optomechanical magnetometry |
in a many-body quantum system, local operators in the heisenberg picture o (t )=ei h to e-i h t spread as time increases. recent studies have attempted to find features of that spreading which could distinguish between chaotic and integrable dynamics. the operator entanglement—the entanglement entropy in operator space... | operator entanglement in interacting integrable quantum systems: the case of the rule 54 chain |
we develop a perturbation theory of quantum (and classical) master equations with slowly varying parameters, applicable to systems which are externally controlled on a time scale much longer than their characteristic relaxation time. we apply this technique to the analysis of finite-time isothermal processes in which, ... | slow dynamics and thermodynamics of open quantum systems |
we report a throughout analysis of the entanglement entropies related to different symmetry sectors in the low-lying primary excited states of a conformal field theory (cft) with an internal u(1) symmetry. our findings extend recent results for the ground state. we derive a general expression for the charged moments, i... | symmetry resolved entanglement entropy of excited states in a cft |
cavity optomechanical systems enable interactions between light and mechanical resonators, providing a platform both for fundamental physics of macroscopic quantum systems and for practical applications of precision sensing. the resonant enhancement of both mechanical and optical response in the cavity optomechanical s... | cavity optomechanical sensing |
recently, first principle-based predictions of lattice thermal conductivity κ from perturbation theory have achieved significant success. however, it only includes three-phonon scattering due to the assumption that four-phonon and higher-order processes are generally unimportant. also, directly evaluating the scatterin... | quantum mechanical prediction of four-phonon scattering rates and reduced thermal conductivity of solids |
we propose a measure, which we call the dissipative spectral form factor (dsff), to characterize the spectral statistics of non-hermitian (and nonunitary) matrices. we show that dsff successfully diagnoses dissipative quantum chaos and reveals correlations between real and imaginary parts of the complex eigenvalues up ... | spectral statistics of non-hermitian matrices and dissipative quantum chaos |
we introduce an exact mapping of clifford (stabilizer) random tensor networks (rtns) and monitored quantum circuits, onto a statistical mechanics model. with haar unitaries, the fundamental degrees of freedom ('spins') are permutations because all operators commuting with the action of the unitaries on a tensor product... | statistical mechanics model for clifford random tensor networks and monitored quantum circuits |
the growth of commutators of initially commuting local operators diagnoses the onset of chaos in quantum many-body systems. we compute such commutators of local field operators with n components in the (2 +1 )-dimensional o (n ) nonlinear sigma model to leading order in 1 /n . the system is taken to be in thermal equil... | onset of many-body chaos in the o (n ) model |
the hemoprotein myoglobin is a model system for the study of protein dynamics. we used time-resolved serial femtosecond crystallography at an x-ray free-electron laser to resolve the ultrafast structural changes in the carbonmonoxy myoglobin complex upon photolysis of the fe-co bond. structural changes appear throughou... | direct observation of ultrafast collective motions in co myoglobin upon ligand dissociation |
a quantum network consisting of magnonic and mechanical nodes connected by light is proposed. recent years have witnessed a significant development in cavity magnonics based on collective spin excitations in ferrimagnetic crystals, such as yttrium iron garnet (yig). magnonic systems are considered to be a promising bui... | quantum network with magnonic and mechanical nodes |
dislocation cores, the regions in the immediate vicinity of dislocation lines, control a number of properties such as dislocation mobility, cross-slip and short-range interactions with other defects. the quantitative modeling of dislocation cores requires an electronic-level description of atomic bonding. ab initio qua... | ab initio modeling of dislocation core properties in metals and semiconductors |
the deconfined quantum critical point (dqcp) is an example of phase transitions beyond the landau symmetry breaking paradigm that attracts wide interest. however, its nature has not been settled after decades of study. in this paper, we apply the recently proposed fuzzy sphere regularization to study the $\mathrm{so}(5... | the $\\mathrm{so}(5)$ deconfined phase transition under the fuzzy sphere microscope: approximate conformal symmetry, pseudo-criticality, and operator spectrum |
we examine the so-called thermodynamic uncertainty relation (tur), a cost-precision trade-off relationship in transport systems. based on the fluctuation symmetry, we derive a condition for invalidating the tur for general nonequilibrium (classical and quantum) systems. we find that the first nonzero contribution to th... | assessing the validity of the thermodynamic uncertainty relation in quantum systems |
the operator entanglement (oe) is a key quantifier of the complexity of a reduced density matrix. in out-of-equilibrium situations, e.g., after a quantum quench of a product state, it is expected to exhibit an entanglement barrier. the oe of a reduced density matrix initially grows linearly as entanglement builds up be... | entanglement barrier and its symmetry resolution: theory and experimental observation |
quantum superposition in mechanical systems is not only key evidence for macroscopic quantum coherence, but can also be utilized in modern quantum technology. here we propose an efficient approach for creating macroscopically distinct mechanical superposition states in a two-mode optomechanical system. photon hopping b... | macroscopic quantum superposition in cavity optomechanics |
macroscopic realism is the name for a class of modifications to quantum theory that allow macroscopic objects to be described in a measurement-independent manner, while largely preserving a fully quantum mechanical description of the microscopic world. objective collapse theories are examples which aim to solve the qua... | a strict experimental test of macroscopic realism in a superconducting flux qubit |
we explore a class of "open" quantum circuit models with local decoherence ("noise") and local projective measurements, each respecting a global z2 symmetry. the model supports a spin-glass phase where the z2 symmetry is spontaneously broken [not possible in an equilibrium one-dimensional (1d) system], a paramagnetic p... | decodable hybrid dynamics of open quantum systems with z2 symmetry |
the security of quantum communication is based on the laws of quantum mechanics, which can resist attacks from any powerful classical and quantum computers. it has great potential in secure communication in the future. one well-known form of quantum communication is quantum key distribution (qkd), where random numbers ... | drastic increase of channel capacity in quantum secure direct communication using masking |
hybrid spin-mechanical setups offer a versatile platform for quantum science and technology, but improving the spin-phonon as well as the spin-spin couplings of such systems remains a crucial challenge. here, we propose and analyze an experimentally feasible and simple method for exponentially enhancing the spin-phonon... | enhancing spin-phonon and spin-spin interactions using linear resources in a hybrid quantum system |
quantum error correction and symmetry arise in many areas of physics, including many-body systems, metrology in the presence of noise, fault-tolerant computation, and holographic quantum gravity. here, we study the compatibility of these two important principles. if a logical quantum system is encoded into n physical s... | continuous symmetries and approximate quantum error correction |
a remarkable feature of quantum many-body systems is the orthogonality catastrophe that describes their extensively growing sensitivity to local perturbations and plays an important role in condensed matter physics. here we show that the dynamics of the orthogonality catastrophe can be fully characterized by the quantu... | orthogonality catastrophe as a consequence of the quantum speed limit |
we report an experimental realization of maxwell's demon in a photonic setup. we show that a measurement at the few-photons level followed by a feed-forward operation allows the extraction of work from intense thermal light into an electric circuit. the interpretation of the experiment stimulates the derivation of an e... | photonic maxwell's demon |
we use quantum estimation theory to derive a thermodynamic uncertainty relation in markovian open quantum systems, which bounds the fluctuation of continuous measurements. the derived quantum thermodynamic uncertainty relation holds for arbitrary continuous measurements satisfying a scaling condition. we derive two rel... | quantum thermodynamic uncertainty relation for continuous measurement |
there has been rapidly growing interest in hybrid quantum devices involving a solid-state spin and a macroscopic mechanical oscillator. such hybrid devices create exciting opportunities to mediate interactions between disparate quantum bits (qubits) and to explore the quantum regime of macroscopic mechanical objects. i... | topical review: spins and mechanics in diamond |
we consider the long-time limit of out-of-time-order correlators (otocs) in two classes of quantum lattice models with time evolution governed by local unitary quantum circuits and maximal butterfly velocity vb=1 . using a transfer matrix approach, we present analytic results for the long-time value of the otoc on and ... | maximum velocity quantum circuits |
photonic entanglement swapping, the procedure of entangling photons without any direct interaction, is a fundamental test of quantum mechanics and an essential resource to the realization of quantum networks. probabilistic sources of nonclassical light were used for seminal demonstration of entanglement swapping, but a... | entanglement swapping with photons generated on demand by a quantum dot |
we describe the crossover from generalized to conventional hydrodynamics in nearly integrable systems. integrable systems have infinitely many conserved quantities, which spread ballistically, in general. when integrability is broken, only a few of these conserved quantities survive. the remaining conserved quantities ... | diffusive hydrodynamics from integrability breaking |
the question of how long it takes a particle to tunnel through a potential barrier has been a subject of intense theoretical debate for the last 80 years. in this decade of attosecond science, the answer to this question not only promises to deepen our understanding of fundamental quantum mechanics, but also has signif... | attosecond science and the tunnelling time problem |
a paradigm shift in quantum thermometry is proposed. to date, thermometry has relied on local estimation, which is useful to reduce statistical fluctuations once the temperature is very well known. in order to estimate temperatures in cases where few measurement data or no substantial prior knowledge are available, we ... | global quantum thermometry |
recent work has revealed the central role played by the kirkwood-dirac quasiprobability (kdq) as a tool to properly account for non-classical features in the context of condensed matter physics (scrambling, dynamical phase transitions) metrology (standard and post-selected), thermodynamics (power output and fluctuation... | kirkwood-dirac quasiprobability approach to the statistics of incompatible observables |
in this work we probe the operator growth for systems with lie symmetry using tools from quantum information. namely, we investigate the krylov complexity, entanglement negativity, entanglement entropy, and capacity of entanglement for systems with su(1,1) and su(2) symmetry. our main tools are two-mode coherent states... | probing the entanglement of operator growth |
stochastic thermodynamics lays down a broad framework to revisit the venerable concepts of heat, work and entropy production for individual stochastic trajectories of mesoscopic systems. remarkably, this approach, relying on stochastic equations of motion, introduces time into the description of thermodynamic processes... | driving rapidly while remaining in control: classical shortcuts from hamiltonian to stochastic dynamics |
a two-dimensional (2d) topological insulator (ti) exhibits the quantum spin hall (qsh) effect, in which topologically protected spin-polarized conducting channels exist at the sample edges. experimental signatures of the qsh effect have recently been reported for the first time in an atomically thin material, monolayer... | imaging quantum spin hall edges in monolayer wte2 |
recent experiments on rydberg atom arrays have found evidence of anomalously slow thermalization and persistent density oscillations, which have been interpreted as a many-body analog of the phenomenon of quantum scars. periodic dynamics and atypical scarred eigenstates originate from a "hard" kinetic constraint: the n... | quantum scars of bosons with correlated hopping |
by generalizing concepts from classical stochastic dynamics, we establish the basis for a theory of metastability in markovian open quantum systems. partial relaxation into long-lived metastable states—distinct from the asymptotic stationary state—is a manifestation of a separation of time scales due to a splitting in ... | towards a theory of metastability in open quantum dynamics |
nonclassical states are essential for optics-based quantum information processing, but their fragility limits their utility for practical scenarios in which loss and noise inevitably degrade, if not destroy, nonclassicality. exploiting nonclassical states in quantum metrology yields sensitivity advantages over all clas... | entanglement-enhanced sensing in a lossy and noisy environment |
we theoretically investigate the effects of atom losses in the one-dimensional (1d) bose gas with repulsive contact interactions, a famous quantum integrable system also known as the lieb-liniger gas. the generic case of k-body losses (k = 1,2,3,...) is considered. we assume that the loss rate is much smaller than the ... | the effect of atom losses on the distribution of rapidities in the one-dimensional bose gas |
quantum many-body systems with fracton constraints are widely conjectured to exhibit unconventional low-energy phases of matter. in this paper, we demonstrate the existence of a variety of such exotic quantum phases in the ground states of a dipole-moment conserving bose-hubbard model in one dimension. for integer boso... | fractonic luttinger liquids and supersolids in a constrained bose-hubbard model |
we introduce a subsystem generalization of the spectral form factor via pseudoentropy, the von-neumann entropy for the reduced transition matrix. we consider a transition matrix between the thermofield double state and its time-evolved state in two-dimensional conformal field theories, and study the time dependence of ... | subregion spectrum form factor via pseudoentropy |
in locally interacting quantum many-body systems, the velocity of information propagation is finitely bounded, and a linear light cone can be defined. outside the light cone, the amount of information rapidly decays with distance. when systems have long-range interactions, it is highly nontrivial whether such a linear ... | strictly linear light cones in long-range interacting systems of arbitrary dimensions |
gauge fields in condensed matter physics give rise to nonreciprocal and topological transport phenomena and exotic electronic states1. nanomechanical systems are applied as sensors and in signal processing, and feature strong nonlinearities. gauge potentials acting on such systems could induce quantum hall physics for ... | synthetic gauge fields for phonon transport in a nano-optomechanical system |
quantum steering refers to the possibility for alice to remotely steer bob's state by performing local measurements on her half of a bipartite system. two necessary ingredients for steering are entanglement and incompatibility of alice's measurements. in particular, it is known that for the case of pure states of maxim... | one-to-one mapping between steering and joint measurability problems |
we investigate many-body localization in the presence of a single-particle mobility edge. by considering an interacting deterministic model with an incommensurate potential in one dimension we find that the single-particle mobility edge in the noninteracting system leads to a many-body mobility edge in the correspondin... | many-body localization and quantum nonergodicity in a model with a single-particle mobility edge |
we present a feynman integral representation for the general momentum-space scalar n -point function in any conformal field theory. this representation solves the conformal ward identities and features an arbitrary function of n (n -3 )/2 variables which play the role of momentum-space conformal cross ratios. it involv... | conformal n -point functions in momentum space |
a general thermodynamic framework is presented for open quantum systems in fixed contact with a thermal reservoir. the first and second law are obtained for arbitrary system-reservoir coupling strengths, and including both factorized and correlated initial conditions. the thermodynamic properties are adapted to the gen... | strong coupling thermodynamics of open quantum systems |
thermodynamic uncertainty relations quantify how the signal-to-noise ratio of a given observable is constrained by dissipation. fluctuation relations generalize the second law of thermodynamics to stochastic processes. we show that any fluctuation relation directly implies a thermodynamic uncertainty relation, consider... | thermodynamic uncertainty relations including measurement and feedback |
we show that short-range correlations have a dramatic impact on the steady-state phase diagram of quantum driven-dissipative systems. this effect, never observed in equilibrium, follows from the fact that ordering in the steady state is of dynamical origin, and is established only at very long times, whereas in thermod... | cluster mean-field approach to the steady-state phase diagram of dissipative spin systems |
gauge theories represent a fundamental framework underlying modern physics, constituting the basis of the standard model and also providing useful descriptions of various phenomena in condensed matter. realizing gauge theories on accessible and tunable tabletop quantum devices offers the possibility to study their dyna... | cold-atom quantum simulators of gauge theories |
in this review the debated rapport between thermodynamics and quantum mechanics is addressed in the framework of the theory of periodically-driven/controlled quantum-thermodynamic machines. the basic model studied here is that of a two-level system (tls), whose energy is periodically modulated while the system is coupl... | thermodynamics of quantum systems under dynamical control |
the study of the entanglement dynamics plays a fundamental role in understanding the behaviour of many-body quantum systems out of equilibrium. in the presence of a globally conserved charge, further insights are provided by the knowledge of the resolution of entanglement in the various symmetry sectors. here, we carry... | exact quench dynamics of symmetry resolved entanglement in a free fermion chain |
quantum chaos in many-body systems provides a bridge between statistical and quantum physics with strong predictive power. this framework is valuable for analyzing properties of complex quantum systems such as energy spectra and the dynamics of thermalization. while contemporary methods in quantum chaos often rely on r... | emergent quantum state designs from individual many-body wave functions |
owing to its probabilistic nature, a measurement process in quantum mechanics produces a distribution of possible outcomes. this distribution—or its fourier transform known as full counting statistics (fcs)—contains much more information than say the mean value of the measured observable, and accessing it is sometimes ... | nonequilibrium full counting statistics and symmetry-resolved entanglement from space-time duality |
we study disorder-free many-body localization in the flat-band creutz ladder, which was recently realized in cold-atoms in an optical lattice. in a non-interacting case, the flat-band structure of the system leads to a wannier wavefunction localized on four adjacent lattice sites. in the flat-band regime both with and ... | flat-band many-body localization and ergodicity breaking in the creutz ladder |
particle physics underpins our understanding of the world at a fundamental level by describing the interplay of matter and forces through gauge theories. yet, despite their unmatched success, the intrinsic quantum mechanical nature of gauge theories makes important problem classes notoriously difficult to address with ... | simulating 2d lattice gauge theories on a qudit quantum computer |
quenched randomness can have a dramatic effect on the dynamics of isolated 1d quantum many-body systems, even for systems that thermalize. this is because transport, entanglement, and operator spreading can be hindered by "griffiths" rare regions, which locally resemble the many-body-localized phase and thus act as wea... | dynamics of entanglement and transport in one-dimensional systems with quenched randomness |
as quantum computers become available to the general public, the need has arisen to train a cohort of quantum programmers, many of whom have been developing classical computer programs for most of their careers. while currently available quantum computers have less than 100 qubits, quantum computing hardware is widely ... | quantum algorithm implementations for beginners |
the manipulation of quantum "resources" such as entanglement, coherence, and magic states lies at the heart of quantum science and technology, empowering potential advantages over classical methods. in practice, a particularly important kind of manipulation is to "purify" the quantum resources since they are inevitably... | no-go theorems for quantum resource purification |
thermodynamic uncertainty relations (turs) are recently established relations between the relative uncertainty of time-integrated currents and entropy production in nonequilibrium systems. for small perturbations away from equilibrium, linear response (lr) theory provides the natural framework to study generic nonequil... | unified thermodynamic uncertainty relations in linear response |
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