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intermolecular forces are pervasive in nature and give rise to various phenomena including surface wetting1, adhesive forces in biology2,3, and the casimir effect4, which causes two charge-neutral, metal objects in vacuum to attract each other. these interactions are the result of quantum fluctuations of electromagneti... | measurement of the casimir torque |
phonon lasers are mechanical analogues of the ubiquitous optical laser and have been realized in a variety of contexts1-12. however, no such demonstration exists for mesoscopic levitated optomechanical systems, which are emerging as important platforms for conducting fundamental tests of quantum mechanics13-15 and grav... | an optical tweezer phonon laser |
in this letter, we show that the shore-johnson axioms for the maximum entropy principle in statistical estimation theory account for a considerably wider class of entropic functional than previously thought. apart from a formal side of the proof where a one-parameter class of admissible entropies is identified, we subs... | maximum entropy principle in statistical inference: case for non-shannonian entropies |
we argue that the lorentzian path integral is a better starting point for quantum cosmology than its euclidean counterpart. in particular, we revisit the minisuperspace calculation of the feynman path integral for quantum gravity with a positive cosmological constant. instead of rotating to euclidean time, we deform th... | lorentzian quantum cosmology |
shortcuts to adiabaticity (sta) constitute driving schemes that provide an alternative to adiabatic protocols to control and guide the dynamics of classical and quantum systems without the requirement of slow driving. research on sta advances swiftly with theoretical progress being accompanied by experiments on a wide ... | focus on shortcuts to adiabaticity |
a basic diagnostic of entanglement in mixed quantum states is known as the positive partial transpose (pt) criterion. such criterion is based on the observation that the spectrum of the partially transposed density matrix of an entangled state contains negative eigenvalues, in turn, used to define an entanglement measu... | twisted and untwisted negativity spectrum of free fermions |
we give two quantum algorithms for solving semidefinite programs (sdps) providing quantum speed-ups. we consider sdp instances with $m$ constraint matrices, each of dimension $n$, rank at most $r$, and sparsity $s$. the first algorithm assumes access to an oracle to the matrices at unit cost. we show that it has run ti... | quantum sdp solvers: large speed-ups, optimality, and applications to quantum learning |
inhomogeneous quantum critical systems in one spatial dimension have been studied by using conformal field theory in static curved backgrounds. two interesting examples are the free fermion gas in the harmonic trap and the inhomogeneous xx spin chain called rainbow chain. for conformal field theories defined on static ... | entanglement hamiltonian and entanglement contour in inhomogeneous 1d critical systems |
quantum work is usually determined from two projective measurements of the energy at the beginning and at the end of a thermodynamic process. however, this paradigm cannot be considered thermodynamically consistent as it does not account for the thermodynamic cost of these measurements. to remedy this conceptual incons... | quantum work and the thermodynamic cost of quantum measurements |
we present a fabrication process for fully superconducting interconnects compatible with superconducting qubit technology. these interconnects allow for the three dimensional integration of quantum circuits without introducing lossy amorphous dielectrics. they are composed of indium bumps several microns tall separated... | qubit compatible superconducting interconnects |
we prove the second law of thermodynamics and the nonequilibrium fluctuation theorem for pure quantum states. the entire system obeys reversible unitary dynamics, where the initial state of the heat bath is not the canonical distribution but is a single energy eigenstate that satisfies the eigenstate-thermalization hyp... | fluctuation theorem for many-body pure quantum states |
the polarization property of high harmonics from gallium selenide is investigated using linearly polarized midinfrared laser pulses. with a high electric field, the perpendicular polarization component of the odd harmonics emerges, which is not present with a low electric field and cannot be explained by the perturbati... | polarization-resolved study of high harmonics from bulk semiconductors |
coherence arises from the superposition principle and plays a key role in quantum mechanics. recently, baumgratz et al. [t. baumgratz, m. cramer, and m. b. plenio, phys. rev. lett. 113, 140401 (2014), 10.1103/physrevlett.113.140401] established a rigorous framework for quantifying the coherence of finite-dimensional qu... | quantifying coherence of gaussian states |
understanding how small imperfections affect a system's dynamics is one of the central questions of theoretical physics—namely, do properties change in a smooth way, such that small perturbation leads to small changes, or do they change discontinuously? localization in disordered many-particle quantum systems has been ... | interaction instability of localization in quasiperiodic systems |
we defend the fock-space hamiltonian truncation method, which allows us to calculate numerically the spectrum of strongly coupled quantum field theories, by putting them in a finite volume and imposing a uv cutoff. the accuracy of the method is improved via an analytic renormalization procedure inspired by the usual ef... | hamiltonian truncation study of the φ4 theory in two dimensions |
we consider quantum and private communications assisted by repeaters, from the basic scenario of a single repeater chain to the general case of an arbitrarily-complex quantum network, where systems may be routed through single or multiple paths. in this context, we investigate the ultimate rates at which two end-partie... | capacities of repeater-assisted quantum communications |
autonomous engines operating at the nanoscale can be prone to deleterious fluctuations in the heat and particle currents. thermodynamic uncertainty relations (turs) express a fundamental lower bound which translates a trade-off relation between precision and entropy production. importantly, recent studies have shown th... | thermodynamics of precision in quantum nonequilibrium steady states |
entropy appears in many contexts (thermodynamics, statistical mechanics, information theory, measure-preserving dynamical systems, topological dynamics, etc.) as a measure of different properties (energy that cannot produce work, disorder, uncertainty, randomness, complexity, etc.). in this review, we focus on the so-c... | a brief review of generalized entropies |
complete characterization of states and processes that occur within quantum devices is crucial for understanding and testing their potential to outperform classical technologies for communications and computing. however, solving this task with current state-of-the-art techniques becomes unwieldy for large and complex q... | experimental quantum homodyne tomography via machine learning |
structured light has become topical of late, where controlling light in all its degrees of freedom has offered novel states of light long predicted, enhanced functionality in applications, and a modern toolbox for probing fundamental science. structuring light as single photons and entangled states allows the spatial m... | quantum structured light in high dimensions |
we develop the gauge theory formulation of n = 1 jackiw-teitelboim supergravity in terms of the underlying osp(1|2, &r;) supergroup, focusing on boundary dynamics and the exact structure of gravitational amplitudes. we prove that the bf description reduces to a super-schwarzian quantum mechanics on the holographic boun... | supergroup structure of jackiw-teitelboim supergravity |
the fractional schrödinger equation (fse)—a natural extension of the standard schrödinger equation—is the basis of fractional quantum mechanics. it can be obtained by replacing the kinetic-energy operator with a fractional derivative. here, we report the experimental realisation of an optical fse for femtosecond laser ... | experimental realisations of the fractional schrödinger equation in the temporal domain |
this study uses a simplified third-order generalized nonlinear schrödinger equation (3-order gnlse) to investigate the soliton phase shift. most of the time, this model is used to explain what happens to ultrashort pulses in quantum environments and optical fibers. on the other hand, it could be used as a wave model to... | a hybrid analytical and numerical analysis of ultra-short pulse phase shifts |
control of ferromagnetism is of critical importance for a variety of proposed spintronic and topological quantum technologies. inducing long-range ferromagnetic order in ultrathin 2d crystals will provide more functional possibility to combine their unique electronic, optical and mechanical properties to develop new mu... | strong intrinsic room-temperature ferromagnetism in freestanding non-van der waals ultrathin 2d crystals |
the violation of a leggett–garg inequality confirms the incompatibility between quantum mechanics and the combined premises (called macro-realism) of macroscopic realism (mr) and noninvasive measurability (nim). arguments can be given that the incompatibility arises because mr fails for systems in a superposition of ma... | weak versus deterministic macroscopic realism, and einstein–podolsky–rosen's elements of reality |
we introduce and describe a class of simple facilitated quantum spin models in which the dynamics is due to the repeated application of unitary gates. the gates are applied periodically in time, so their combined action constitutes a floquet unitary. the dynamics of the models we discuss can be classically simulated, a... | facilitated quantum cellular automata as simple models with non-thermal eigenstates and dynamics |
we study the role of hamiltonian complexity in the performance of quantum annealers. we consider two general classes of annealing hamiltonians: stoquastic ones, which can be simulated efficiently using the quantum monte carlo algorithm, and nonstoquastic ones, which cannot be treated efficiently. we implement the latte... | nonstoquastic hamiltonians and quantum annealing of an ising spin glass |
schwarzian quantum mechanics describes the collective ir mode of the syk model and captures key features of 2d black hole dynamics. exact results for its correlation functions were obtained in [1]. we compare these results with bulk gravity expectations. we find that the semi-classical limit of the oto four-point funct... | shockwave s-matrix from schwarzian quantum mechanics |
layer-stacking domain walls in bilayer graphene are emerging as a fascinating one-dimensional system that features stacking solitons structurally and quantum valley hall boundary states electronically. the interactions between electrons in the 2d graphene domains and the one-dimensional domain-wall solitons can lead to... | soliton-dependent plasmon reflection at bilayer graphene domain walls |
in this paper, we present holographic descriptions of entanglement phase transition using ads/bcft. first, we analytically calculate the holographic pseudo entropy in the ads/bcft model with a brane localized scalar field and show the entanglement phase transition behavior where the time evolution of entropy changes fr... | entanglement phase transition in holographic pseudo entropy |
these are exciting times for quantum physics as new quantum technologies are expected to soon transform computing at an unprecedented level. simultaneously network science is flourishing proving an ideal mathematical and computational framework to capture the complexity of large interacting systems. here we provide a c... | complex quantum networks: a topical review |
symmetries and quantum anomalies serve as powerful tools for constraining complicated quantum many-body systems, offering valuable insights into low-energy characteristics based on their ultraviolet structure. nevertheless, their applicability has traditionally been confined to closed quantum systems, rendering them la... | detecting quantum anomalies in open systems |
in the qbist approach to quantum mechanics, a measurement is an action an agent takes on the world external to herself. a measurement device is an extension of the agent and both measurement outcomes and their probabilities are personal to the agent. according to qbism, nothing in the quantum formalism implies either t... | when will two agents agree on a quantum measurement outcome? intersubjective agreement in qbism |
we explore the entanglement structure and wave function properties of continuously monitored free fermions with $u(1)$-symmetry in two spatial dimensions (2d). deriving the fermion replica-keldysh field theory, and a bosonic effective long-wavelength action, we discuss similarities and differences between entanglement ... | entanglement phases, localization and multifractality of monitored free fermions in two dimensions |
we study the spreading of quantum information in a recently introduced family of brickwork quantum circuits that generalises the dual-unitary class. these circuits are unitary in time, while their spatial dynamics is unitary only in a restricted subspace. first, we show that local operators spread at the speed of light... | quantum information spreading in generalised dual-unitary circuits |
we consider the quantum many-body dynamics at the weak-coupling scaling. we derive rigorously the quantum boltzmann equation, which contains the classical hard sphere model and, effectively, the inverse power law model, from the many-body dynamics assuming a physical and optimal regularity bound. the regularity bound w... | the derivation of the boltzmann equation from quantum many-body dynamics |
it has been shown that it is theoretically possible for there to exist higher-order quantum processes in which the operations performed by separate parties cannot be ascribed a definite causal order. some of these processes are believed to have a physical realization in standard quantum mechanics via coherent control o... | time-delocalized quantum subsystems and operations: on the existence of processes with indefinite causal structure in quantum mechanics |
the process of measurement can modify the state of a quantum system and its subsequent evolution. here, we demonstrate the control of quantum tunneling in an ultracold lattice gas by the measurement backaction imposed by the act of imaging the atoms, i.e., light scattering. by varying the rate of light scattering from ... | measurement-induced localization of an ultracold lattice gas |
under the heisenberg evolution in chaotic quantum systems, initially simple operators evolve into complicated ones and ultimately cover the whole operator space. we study the growth of the operator "size" in this process, which is related to the out-of-time-order correlator (otoc). we derive the full time evolution of ... | operator size distribution in large n quantum mechanics of majorana fermions |
a system of majorana zero modes with random infinite-range interactions—the sachdev-ye-kitaev (syk) model—is thought to exhibit an intriguing relation to the horizons of extremal black holes in two-dimensional anti-de sitter space. this connection provides a rare example of holographic duality between a solvable quantu... | black hole on a chip: proposal for a physical realization of the sachdev-ye-kitaev model in a solid-state system |
we unveil the stable (d +1 )-dimensional topological structures underlying the quench dynamics for all of the altland-zirnbauer classes in d =1 dimension, and we propose to detect such dynamical topology from the time evolution of entanglement spectra. focusing on systems in classes bdi and d, we find crossings in sing... | topological entanglement-spectrum crossing in quench dynamics |
interacting many-body systems with explicitly accessible spatiotemporal correlation functions are extremely rare, especially in the absence of bethe-ansatz or yang-baxter integrability. recently, we identified a remarkable class of such systems and termed them dual-unitary quantum circuits. these are brickwork-type loc... | correlations in perturbed dual-unitary circuits: efficient path-integral formula |
i show that nondecreasing entropy provides a necessary and sufficient condition to convert the state of a physical system into a different state by a reversible transformation that acts on the system of interest and a further "catalyst," whose state has to remain invariant exactly in the transition. this statement is p... | entropy and reversible catalysis |
bismuth crystal is known for its noteworthy properties resulting from particular electronic states, e.g., the shubnikov-de haas effect and the de haas-van alphen effect. above all, the large diamagnetism of bismuth had been a long-standing puzzle since soon after the establishment of quantum mechanics, which was resolv... | transport properties and diamagnetism of dirac electrons in bismuth |
sympathetic cooling with ultracold atoms and atomic ions enables ultralow temperatures in systems where direct laser or evaporative cooling is not possible. it has so far been limited to the cooling of other microscopic particles, with masses up to 90 times larger than that of the coolant atom. here, we use ultracold a... | sympathetic cooling of a membrane oscillator in a hybrid mechanical-atomic system |
in this work we study the time evolutions of (renyi) entanglement entropy of locally excited states in two dimensional conformal field theories (cfts) at finite temperature. we consider excited states created by acting with local operators on thermal states and give both field theoretic and holographic calculations. in... | quantum entanglement of localized excited states at finite temperature |
we revisit brownian sachdev-ye-kitaev model and argue that it has emergent energy conservation overlooked in the literature before. we solve this model in the double-scaled regime and demonstrate hyperfast scrambling, exponential decay of correlation functions, bounded spectrum and unexpected factorization of higher-po... | revisiting brownian syk and its possible relations to de sitter |
ultrarelativistic heavy ion collisions will first realize many nucleon-nucleon scatterings, happening instantaneously and therefore necessarily in parallel, due to the short collision time. an appropriate quantum mechanical tool to treat that problem is s-matrix theory, and it has been known for a long time how to deri... | parallel scattering, saturation, and generalized agk theorem in the epos4 framework, with applications for heavy ion collisions at 5.02 atev and at 200 agev |
microscopic nuclear theory is based on the tenet that atomic nuclei can be accurately described as collections of point-like nucleons interacting via two- and many-body forces obeying nonrelativistic quantum mechanics—and the concept of the ab initio approach is to calculate nuclei accordingly. the forces are fixed in ... | what is ab initio? |
quantum periods appear in many contexts, from quantum mechanics to local mirror symmetry. they can be described in terms of topological string free energies and wilson loops, in the so-called nekrasov-shatashvili limit. we consider the trans-series extension of the holomorphic anomaly equations satisfied by these quant... | on the resurgent structure of quantum periods |
central spin systems, in which a central spin is singled out and interacts nonlocally with several bath spins, are paradigmatic models for nitrogen-vacancy centers and quantum dots. they show complex emergent dynamics and stationary phenomena which, despite the collective nature of their interaction, are still largely ... | non-gaussian dynamics of quantum fluctuations and mean-field limit in open quantum central spin systems |
in 1935, einstein, podolsky, and rosen (epr) conceived a gedanken experiment which became a cornerstone of quantum technology and still challenges our understanding of reality and locality today. while the experiment has been realized with small quantum systems, a demonstration of the epr paradox with massive many-part... | einstein-podolsky-rosen experiment with two bose-einstein condensates |
diffusion occurs in numerous physical systems throughout nature, drawing its generality from the universality of the central limit theorem. approximately a century ago it was realized that an extension to this type of dynamics can be obtained in the form of "anomalous" diffusion, where distributions are allowed to have... | colloquium: anomalous statistics of laser-cooled atoms in dissipative optical lattices |
we demonstrate a new approach for dynamically manipulating the optical response of an atomically thin semiconductor, a monolayer of mose2, by suspending it over a metallic mirror. first, we show that suspended van der waals heterostructures incorporating a mose2 monolayer host spatially homogeneous, lifetime-broadened ... | controlling excitons in an atomically thin membrane with a mirror |
we initiate the study of open quantum field theories using holographic methods. specifically, we consider a quantum field theory (the system) coupled to a holographic field theory at finite temperature (the environment). we investigate the effects of integrating out the holographic environment with an aim of obtaining ... | open quantum systems and schwinger-keldysh holograms |
we study quantum information scrambling in spin models with both long-range all-to-all and short-range interactions. we argue that a simple global, spatially homogeneous interaction together with local chaotic dynamics is sufficient to give rise to fast scrambling, which describes the spread of quantum information over... | minimal model for fast scrambling |
we analyze a simple model of quantum dynamics, which is a discrete-time deterministic version of the fredrickson-andersen model. this model is integrable, with a quasiparticle description related to the classical hard-rod gas. despite the integrability of the model, commutators of physical operators grow with a diffusi... | operator growth and eigenstate entanglement in an interacting integrable floquet system |
we develop the procedures of gauging and ungauging, reveal their operational meaning and propose their generalization in a systematic manner within the framework of quantum error-correcting codes. we demonstrate with an example of the subsystem bacon-shor code that the ungauging procedure can result in models with unus... | ungauging quantum error-correcting codes |
we investigate the full counting statistics of charge transport in u(1)-symmetric random unitary circuits. we consider an initial mixed state prepared with a chemical potential imbalance between the left and right halves of the system and study the fluctuations of the charge transferred across the central bond in typic... | full counting statistics of charge in chaotic many-body quantum systems |
conformal field theory (cft) plays a crucial role in the study of various critical phenomena. while much attention has been paid to the critical exponents of different universalities, which correspond to the conformal dimensions of cft primary fields, other important and intricate data such as operator product expansio... | operator product expansion coefficients of the 3d ising criticality via quantum fuzzy spheres |
the study of quantum criticality and entanglement in systems with long-range (lr) interactions is still in its early stages, with many open questions remaining. in this work, we investigate critical exponents and scaling of entanglement entropies (ee) in the lr bilayer heisenberg model using large-scale quantum monte c... | quantum criticality and entanglement for 2d long-range heisenberg bilayer |
are there bounds on quantum information processing and thermalization in many-body quantum systems? the fast-scrambling conjecture states that quantum information processing times must grow at least logarithmically with the number of degrees of freedom. we derive this result for generic systems. we discuss the nonunive... | fast scrambling on sparse graphs |
we study real-time meson-meson scattering processes in (1 +1 )-dimensional qed by means of tensor networks. we prepare initial meson wave packets with given momentum and position introducing an approximation based on the free fermions model. then, we compute the dynamics of two initially separated colliding mesons, obs... | entanglement generation in (1 +1 )d qed scattering processes |
we demonstrate that the prethermal regime of periodically driven (floquet), classical many-body systems can host nonequilibrium phases of matter. in particular, we show that there exists an effective hamiltonian that captures the dynamics of ensembles of classical trajectories despite the breakdown of this description ... | floquet phases of matter via classical prethermalization |
we introduce and realize demons that follow a customary gambling strategy to stop a nonequilibrium process at stochastic times. we derive second-law-like inequalities for the average work done in the presence of gambling, and universal stopping-time fluctuation relations for classical and quantum nonstationary stochast... | thermodynamics of gambling demons |
despite their theoretical importance, dynamic bayesian networks associated with quantum processes are currently not accessible experimentally. we here describe a general scheme to determine the multi-time path probability of a bayesian network based on local measurements on independent copies of a composite quantum sys... | extracting bayesian networks from multiple copies of a quantum system |
we investigate the crucial role played by a global symmetry in the purification timescales and the phase transitions of monitored free fermionic systems separating a mixed and a pure phase. concretely, we study majorana and dirac circuits with z2 and u(1) symmetries, respectively. in the first case, we demonstrate the ... | purification timescales in monitored fermions |
engineered micro- and nanomechanical resonators with ultra-low dissipation constitute a promising platform for various quantum technologies and foundational research. traditionally, the improvement of the resonator's performance through nanomechanical structural engineering has been driven by human intuition and insigh... | ultra-coherent nanomechanical resonators based on inverse design |
we characterize the growth and spreading of operators and entanglement in two paradigmatic nonthermalizing phases—the many-body localized (mbl) phase and the random singlet phase (rsp)—using the entanglement contour and multipartite operator entanglement measures. the entanglement contour characterizes the spacetime sp... | operator and entanglement growth in nonthermalizing systems: many-body localization and the random singlet phase |
we report on the two-dimensional (2d) dynamics of a levitated nanoparticle in an optical cavity. the motion of the nanosphere is strongly coupled to the cavity field by coherent scattering and heavily cooled in the plane orthogonal to the tweezer axis. due to the characteristics of the 2d motion and the strong optomech... | two-dimensional quantum motion of a levitated nanosphere |
neutrino cross section and oscillation measurements depend critically on modeling of hadronic final state interactions (fsi). often, this is one of the largest components of uncertainty in a measurement. this is because of the difficulty in modeling strong interactions in nuclei in a consistent quantum-mechanical frame... | comparison of validation methods of simulations for final state interactions in hadron production experiments |
we have recently shown that the critical anderson electron in d=3 dimensions effectively occupies a spatial region of the infrared (ir) scaling dimension dir≈8/3. here, we inquire about the dimensional substructure involved. we partition space into regions of equal quantum occurrence probabilities, such that the points... | topological dimensions from disorder and quantum mechanics? |
the pillars of quantum theory include entanglement and operators' failure to commute. the page curve quantifies the bipartite entanglement of a many-body system in a random pure state. this entanglement is known to decrease if one constrains extensive observables that commute with each other (abelian "charges"). non-ab... | non-abelian symmetry can increase entanglement entropy |
we construct fermionic conformal field theories (cfts) whose spectra are characterized by quantum stabilizer codes. we exploit our construction to search for fermionic cfts with supersymmetry by focusing on quantum stabilizer codes of the calderbank-shor-steane type, and derive simple criteria for the theories to be su... | supersymmetric conformal field theories from quantum stabilizer codes |
in contrast to interferometry-based quantum sensing, where interparticle interaction is detrimental, quantum many-body probes exploit such interactions to achieve quantum-enhanced sensitivity. in most of the studied quantum many-body probes, the interaction is considered to be short-ranged. here, we investigate the imp... | long-range interacting stark many-body probes with super-heisenberg precision |
the second law of thermodynamics dictates that heat simultaneously flows from the hot to cold bath on average. to go beyond this picture, a range of works in the past decade show that, other than the average dynamical heat flux determined by instantaneous thermal bias, a non-trivial flux contribution of intrinsic geome... | geometric heat pump: controlling thermal transport with time-dependent modulations |
we investigate emergent quantum dynamics of the tilted ising chain in the regime of a weak transverse field. within the leading order perturbation theory, the hilbert space is fragmented into exponentially many decoupled sectors. we find that the sector made of isolated magnons is integrable with dynamics being governe... | fragmentation and emergent integrable transport in the weakly tilted ising chain |
tensor networks (tns) have become one of the most essential building blocks for various fields of theoretical physics such as condensed matter theory, statistical mechanics, quantum information, and quantum gravity. this review provides a unified description of a series of developments in the tn from the statistical me... | developments in the tensor network — from statistical mechanics to quantum entanglement |
integrable quantum systems of finite size are generically robust against weak enough integrability-breaking perturbations, but become quantum chaotic and thermalizing if the integrability breaking is strong enough. we argue that the onset of quantum chaos can be described as a fock-space delocalization process, with th... | onset of many-body quantum chaos due to breaking integrability |
the rich and diverse dynamics of particle-based systems ultimately originates from the coupling of their degrees of freedom via internal interactions. to arrive at a tractable approximation of such many-body problems, coarse graining is often an essential step. power functional theory provides a unique and microscopica... | power functional theory for many-body dynamics |
we design a strange correlator for the recently discovered average symmetry-protected topological (aspt) phases in $1d$ and $2d$. the strange correlator has long-range or power-law behavior if the density matrix $\rho$ is in a nontrivial aspt phase. in all the $2d$ cases considered here, we find interesting connections... | strange correlation function for average symmetry-protected topological phases |
many-body unitary dynamics interspersed with repeated measurements display a rich phenomenology hallmarked by measurement-induced phase transitions. employing feedback-control operations that steer the dynamics toward an absorbing state, we study the entanglement entropy behavior at the absorbing state phase transition... | controlling entanglement at absorbing state phase transitions in random circuits |
we find the spectra and eigenfunctions of both ordinary and supersymmetric quantum-mechanical models describing the motion of a charged particle over the \mathbb{cp}^{n-1}ℂℙn−1 manifold in the presence of a background monopole-like gauge field. the states form degenerate su(n)su(n) multiplets and their wave functions a... | monopole harmonics on \\mathbb{cp}(n-1) |
in this paper, we introduce a new quantity called svd entanglement entropy. this is a generalization of entanglement entropy in that it depends on two different states, as in pre- and post-selection processes. this svd entanglement entropy takes non-negative real values and is bounded by the logarithm of the hilbert sp... | svd entanglement entropy |
the study of t t ¯-perturbed quantum field theories is an active area of research with deep connections to fundamental aspects of the scattering theory of integrable quantum field theories, generalised gibbs ensembles, and string theory. many features of these theories, such as the peculiar behaviour of their ground st... | form factors and correlation functions of t t ¯-deformed integrable quantum field theories |
in this work, we revisit several families of standard hamiltonians that appear in the literature and discuss their symmetries and conserved quantities in the language of commutant algebras. in particular, we start with families of hamiltonians defined by parts that are local, and study the algebra of operators that sep... | from symmetries to commutant algebras in standard hamiltonians |
we describe a method for defining dynamical black hole entropy in gravitational effective field theories (efts). the entropy is constructed order by order in derivatives. for any fixed number of derivatives, the entropy satisfies a non-perturbative second law of black hole mechanics if the black hole remains within the... | a non-perturbative second law of black hole mechanics in effective field theory |
interspersing unitary dynamics with local measurements results in measurement-induced phases and transitions in many-body quantum systems. when the evolution is driven by a local hamiltonian, two types of transitions have been observed, characterized by an abrupt change in the system size scaling of entanglement entrop... | interactions and integrability in weakly monitored hamiltonian systems |
we derive simple bootstrap bounds on correlation functions of the bfss matrix theory/d0-brane quantum mechanics. the result strengthens and extends polchinski's virial theorem bound to finite energies and gives the first non-trivial bound on ⟨tr x2⟩. despite their simplicity, the bounds hint at some features of the dua... | bootstrap bounds on d0-brane quantum mechanics |
we present a unified picture of open quantum systems, the theory of a system probing a noisy thermal environment, distilling lessons learnt from previous holographic analyses. our treatment is applicable both when the system is coupled to short-lived (markovian), and long-lived (non-markovian) environmental degrees of ... | holographic open quantum systems: toy models and analytic properties of thermal correlators |
we study the growth of entanglement between two adjacent regions in a tripartite, one-dimensional many-body system after a quantum quench. combining a replica trick with a space-time duality transformation, we derive an exact, universal relation between the entanglement negativity and rényi-1 /2 mutual information that... | entanglement negativity and mutual information after a quantum quench: exact link from space-time duality |
we theoretically show that strong mechanical quantum squeezing in a linear optomechanical system can be rapidly generated through the dynamical instability reached in the far red-detuned and ultrastrong coupling regime. we show that this mechanism, which harnesses unstable multimode quantum dynamics, is particularly su... | mechanical squeezing via unstable dynamics in a microcavity |
it is generally assumed that a hamiltonian for a physically acceptable quantum system (one that has a positive-definite spectrum and obeys the requirement of unitarity) must be hermitian. however, a pt-symmetric hamiltonian can also define a physically acceptable quantum-mechanical system even if the hamiltonian is not... | pt-symmetric quantum mechanics |
within the framework of non-relativistic quantum mechanics via the nikiforov-uvarov (nu) method, we obtained the energy eigenvalues and the corresponding normalized eigenfunctions of a newly proposed screened kratzer potential for lithium hydride (lih) and hydrogen chloride (hcl) diatomic molecules. with the help of th... | eigensolution, expectation values and thermodynamic properties of the screened kratzer potential |
cavity electromechanics relies on parametric coupling between microwave and mechanical modes to manipulate the mechanical quantum state, and provide a coherent interface between different parts of hybrid quantum systems. high coherence of the mechanical mode is of key importance in such applications, in order to protec... | ground state cooling of an ultracoherent electromechanical system |
the relativistic treatment of the improved varshni plus modified kratzer potential (ivmkp) models in the presence of some induced fields is carried out using the parametric bopp's shift method and standard perturbation theory in the three-dimensional extended relativistic quantum mechanics (3d-erqm) symmetries. the var... | improved energy spectra of the deformed klein-gordon and schrödinger equations under the improved varshni plus modified kratzer potential model in the 3d-erqm and 3d-enrqm symmetries |
we study the lindbladian dynamics of the sachdev-ye-kitaev (syk) model, where the syk model is coupled to markovian reservoirs with jump operators that are either linear or quadratic in the majorana fermion operators. here, the linear jump operators are nonrandom, while the quadratic jump operators are sampled from a g... | lindbladian dynamics of the sachdev-ye-kitaev model |
the present study is based on a theoretically feasible scheme for the enhancement of entanglement between different bipartitions due to magnon squeezing in a two-cavity magnomechanical system, having two microwave cavity mode photons, a magnon mode, and phonon mode. the nonlinearity in the system is well enhanced owing... | enhanced entanglement via magnon squeezing in a two-cavity magnomechanical system |
we develop the first model for extreme mass-ratio inspirals (emris) into a rotating massive black hole driven by the gravitational self-force (gsf). our model is based on an action angle formulation of the method of osculating geodesics for eccentric, equatorial (i.e., spin-aligned) motion in kerr spacetime. the forcin... | eccentric self-forced inspirals into a rotating black hole |
ground states of quantum many-body systems are both entangled and possess a kind of quantum complexity, as their preparation requires universal resources that go beyond the clifford group and stabilizer states. these resources—sometimes described as magic—are also the crucial ingredient for quantum advantage. we study ... | magic-state resource theory for the ground state of the transverse-field ising model |
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