Article
Chemistry, Multidisciplinary
Marina Castelli, Jack Hellerstedt, Cornelius Krull, Spiro Gicev, Lloyd C. L. Hollenberg, Muhammad Usman, Agustin Schiffrin
Summary: Metalated phthalocyanines are robust and versatile molecular complexes whose electronic structure can be significantly altered over extended distances through surface-mediated intermolecular hybridization, with important implications for molecule-based solid-state technologies.
Article
Materials Science, Multidisciplinary
Raffael Gawatz, Ajit C. Balram, Erez Berg, Netanel H. Lindner, Mark S. Rudner
Summary: We investigated the formation of quasisteady states in one-dimensional pumps of interacting fermions at noninteger filling fraction. We found that potential disorder significantly reduces the amplitude of fluctuations of the quasisteady-state current, and the natural orbital occupations and the entanglement entropy display patterns signifying the periodic entangling and disentangling of the system's degrees of freedom. Moreover, prominent features in the system's time-dependent entanglement spectrum reveal the emergence of long timescales associated with the equilibration of many-particle correlations.
Article
Multidisciplinary Sciences
A. Aharon-Steinberg, A. Marguerite, D. J. Perello, K. Bagani, T. Holder, Y. Myasoedov, L. S. Levitov, A. K. Geim, E. Zeldov
Summary: Van der Waals heterostructures exhibit unique electronic properties and have been studied using nonlocal measurements. Graphene edges with charge accumulation are found to produce giant nonlocal effects, supporting long-range currents. Edge conductance affects current flow in moderate magnetic fields, leading to decoupling between edge and bulk transport. The observed exotic flow patterns are sensitive to edge disorder and can flow against the global electric field. Thus, edge transport in charge-neutral graphene can explain various nonlocal transport measurements.
Article
Optics
David Petrosyan, Klaus Molmer
Summary: The study focuses on the collective radiation properties of cold, trapped ensembles of atoms in the high-density regime, finding a strong enhancement in photon emission rate in elongated atomic clouds. The absorption-emission spectrum is broadened and shifted to lower frequencies compared to noninteracting or single-atom spectrum, and analysis is done on the spatial and temporal profiles of emitted radiation. Additionally, exploration is conducted on efficiently exciting collective superradiant states of the atomic ensemble from a long-lived storage state for matter-light interfaces in quantum computation and communication applications.
Article
Physics, Multidisciplinary
Maxwell Block, Yimu Bao, Soonwon Choi, Ehud Altman, Norman Y. Yao
Summary: The presence of long-range power-law interactions fundamentally alters the nature of the transition between scrambling unitary evolution and projective measurements in the dynamics of quantum entanglement. For sufficiently weak power laws, the transition induced by measurements is described by conformal field theory, similar to short-range-interacting hybrid circuits. However, beyond a critical power law, long-range interactions result in a continuum of nonconformal universality classes with continuously varying critical exponents. The phase diagram for a one-dimensional, long-range-interacting hybrid circuit model is numerically determined as a function of the power-law exponent and the measurement rate. Furthermore, a theoretical understanding for the critical power law is provided by using an analytic mapping to a long-range quantum Ising model.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Fluids & Plasmas
Wade Hodson, Christopher Jarzynski
Summary: In this study, the energy dynamics of a particle in a billiard under rapid periodic drive is investigated. For large driving frequencies, it is found that the particle's energy evolves diffusively, satisfying a Fokker-Planck equation. The analysis reveals three phases of energy evolution: prethermalization, slow energy absorption according to the Fokker-Planck equation, and breakdown of rapid driving assumption for large energies and high speeds. Numerical simulations support the theoretical results presented.
Article
Physics, Multidisciplinary
Tomotaka Kuwahara, Keiji Saito
Summary: This study disproves fast scrambling in generic long-range interacting systems with alpha > D, where the OTOC shows a polynomial growth over time as long as alpha > D and the necessary scrambling time over a distance R is larger than t greater than or similar to R[(2 alpha-2D)/(2 alpha-D+1)].
PHYSICAL REVIEW LETTERS
(2021)
Article
Environmental Sciences
Ghazal Shabestanipour, Zachary Brodeur, William H. Farmer, Scott Steinschneider, Richard M. Vogel, Jonathan R. Lamontagne
Summary: Deterministic watershed models (DWMs) used in hydrologic planning, design, and management lack the ability to generate streamflow ensembles required for hydrologic risk management (HRM). This study explores the conversion of DWMs into stochastic watershed models (SWMs) to generate ensembles for HRM. A post-processing approach is proposed to add error to DWM predictions, with an autoregressive model identified as a suitable error model. The value of post-processing is demonstrated in flood and low flow frequency analysis, and the concept of verification and validation of stochastic streamflow ensembles is reintroduced.
WATER RESOURCES RESEARCH
(2023)
Article
Physics, Multidisciplinary
Nishad Maskara, Abhinav Deshpande, Adam Ehrenberg, Minh C. Tran, Bill Fefferman, Alexey Gorshkov
Summary: In this study, we classify phases of a bosonic lattice model based on the computational complexity of classically simulating the system. We find that the system transitions from being classically simulable to classically hard to simulate as it evolves in time. By constructing a complexity phase diagram and deriving analytic bounds on the phase boundary, we uncover the intimate relationship between the location of the phase transition and quantum correlations spread and quantum information transfer. Additionally, we discover two types of transitions, sharp and coarse, corresponding to interacting and noninteracting bosons, respectively.
PHYSICAL REVIEW LETTERS
(2022)
Article
Optics
Darvin Wanisch, Stephan Fritzsche
Summary: In the nonequilibrium dynamics of the XY spin chain with asymptotically decaying interactions, the localization or delocalization of quantum information depends on the speed of interaction decay. Fast interaction decay leads to delocalized quantum information requiring global measurements, while slow decay allows for quasi-instantaneous propagation but mainly accessible by local measurements at early times. Our findings suggest that entanglement is the dominant correlation in fast decay scenarios, whereas it takes some time for correlations to become monogamous in slow decay scenarios.
Article
Physics, Multidisciplinary
Chufan Lyu, Xiaoyu Tang, Junning Li, Xusheng Xu, Man-Hong Yung, Abolfazl Bayat
Summary: Current quantum simulators face limitations in coherence time, operations quality, readout accuracy, and qubit connectivity. Variational quantum algorithms are the most promising approach for near-term practical quantum advantage. This study explores variational quantum algorithms with different qubit connectivity levels for digital simulation of long-range interacting systems and generation of spin squeezed states. The results show that longer-range interactions decrease the efficiency and fidelity of the algorithms, requiring more optimization iterations. Increasing qubit connectivity improves results with fewer resources. Mixing circuit layers with different connectivity levels can significantly enhance performance. The same circuit design can also be used for variational spin squeezed state generation for quantum metrology.
NEW JOURNAL OF PHYSICS
(2023)
Article
Physics, Multidisciplinary
Jamir Marino
Summary: We demonstrate that spatial resolved dissipation can alter the critical points of d-dimensional spin systems in the Ising universality class. By considering power-law decaying spin losses, we reveal the existence of soft modes decoupled from dissipation at small momenta, leading to a nonunitary counterpart of long-range interacting Ising models. A nonequilibrium critical point is found for alpha < 1, characterized by a dynamical field theory described by a Langevin model with coexisting inertial and frictional kinetic coefficients, driven by gapless Markovian noise.
PHYSICAL REVIEW LETTERS
(2022)
Article
Materials Science, Multidisciplinary
Tianci Zhou, Andrew Guo, Shenglong Xu, Xiao Chen, Brian Swingle
Summary: The FKPP equation provides a mean-field theory for out-of-time ordered commutators in quantum chaotic systems. The fractional-derivative FKPP equation offers a mean-field theory for systems with power-law interactions. However, the fractional FKPP description is subject to strong quantum fluctuation effects, and its effectiveness for generic chaotic systems with power-law interactions is unclear. This study investigates this problem using a model of coupled quantum dots and demonstrates that the parameters of the effective theory can be chosen to reproduce the previously found butterfly light cone scalings.
Article
Quantum Science & Technology
Joseph Vovrosh, Rick Mukherjee, Alvise Bastianello, Johannes Knolle
Summary: The study of confinement in quantum spin chains has attracted significant interest in recent years due to its relevance in understanding one-dimensional condensed matter and nonperturbative physics like quantum chromodynamics. In these models, two-particle bound states induced by confinement are called mesons, and interactions between them can lead to the formation of novel hadronic bound states. While their signal in natural collisions may be weak, proposed controllable protocols allow for the clear observation of dynamical hadron formation, which can be simulated in trapped-ion or Rydberg-atom setups.
Article
Multidisciplinary Sciences
Andrea Pizzi, Johannes Knolle, Andreas Nunnenkamp
Summary: Researchers have found that in the presence of long-range interactions and transverse fields, a clean spin-1/2 system can support a variety of different 'higher-order' discrete time crystals with integer and even fractional values of n. These phases, characterized as arguably prethermal non-equilibrium states, are stable in models with continuous driving and time-independent interactions, making them suitable for experimental implementations using ultracold atoms or trapped ions.
NATURE COMMUNICATIONS
(2021)
Article
Computer Science, Theory & Methods
Vincenzo Bonifaci, Enrico Facca, Frederic Folz, Andreas Karrenbauer, Pavel Kolev, Kurt Mehlhorn, Giovanna Morigi, Golnoosh Shahkarami, Quentin Vermande
Summary: In this paper, the application of the slime mold Physarum polycephalum in computing tasks, such as shortest path calculation and network design, is studied. The dynamics of the slime mold is shown to be effective in constructing efficient networks through computer simulations and theoretical analysis. The optimum solution is characterized by minimizing the combined cost of the network and routing demands.
THEORETICAL COMPUTER SCIENCE
(2022)
Article
Physics, Multidisciplinary
Simon B. Jaeger, Tom Schmit, Giovanna Morigi, Murray J. Holland, Ralf Betzholz
Summary: We present a general approach to derive Lindblad master equations for subsystems coupled to dissipative bosonic modes. We apply this approach to the dissipative Dicke model and successfully predict the Dicke phase transition and quantum metastability. The performance of our formalism is validated by comparing with exact diagonalization and numerical integration results.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Multidisciplinary
Shraddha Sharma, Simon B. Jaeger, Rebecca Kraus, Tommaso Roscilde, Giovanna Morigi
Summary: The ground-state entanglement entropy of the extended Bose-Hubbard model with infinite-range interactions was studied. Different behaviors of entanglement entropy were observed at the insulator-superfluid transition under different fillings, as well as the presence of a critical logarithmic term at the superfluid-to-supersolid transition.
PHYSICAL REVIEW LETTERS
(2022)
Article
Optics
S. Burgardt, S. B. Jaeger, J. Fess, S. Hiebel, I Schneider, A. Widera
Summary: We present an experimental implementation of dynamical decoupling on a small ensemble of 25 optically trapped, neutral Cs atoms. By employing a Carr-Purcell-Meiboom-Gill (CPMG) sequence, we observe a significant enhancement of the coherence time from 16.2(9) ms to 178(2) ms.
JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS
(2023)
Article
Physics, Multidisciplinary
Jarrod T. Reilly, John Drew Wilson, Simon B. Jaeger, Christopher Wilson, Murray J. Holland
Summary: This paper proposes a computationally efficient method to derive the unitary evolution that a quantum state is most sensitive to, allowing for optimal use of entangled states in quantum sensing. The maximal obtainable sensitivity using a given quantum state is determined by the largest eigenvalue of the quantum Fisher information matrix (QFIM) and the corresponding evolution is uniquely determined by the coinciding eigenvector. This procedure naturally optimizes multiparameter estimation by determining the maximal set of commuting observables with optimal sensitivity through the eigenvectors of the QFIM.
PHYSICAL REVIEW LETTERS
(2023)
Article
Optics
Simon B. Jaeger, Ralf Betzholz
Summary: Recently, an effective Lindblad master equation was introduced for quantum systems coupled to dissipative bosonic modes. This equation allows for an adiabatic elimination of the bosonic modes and effectively describes the dynamics of the quantum systems. The authors demonstrate that this effective master equation can also describe cooling in systems with light-matter interactions and provide examples of sideband cooling and cooling of an interacting quantum system. They compare their effective description with numerical simulations and highlight the reduction of the Liouville-space dimension achieved with this approach.
Article
Materials Science, Multidisciplinary
Michael P. Kaicher, Davide Vodola, Simon B. Jaeger
Summary: In this study, we numerically investigate the one-dimensional long-range transverse field Ising model (TFIM) in the antiferromagnetic (AFM) regime at zero temperature using generalized Hartree-Fock (GHF) theory. We map the spin operators to Majorana operators and approximate the ground state of the Hamiltonian with a fermionic Gaussian state (FGS). By calculating the ground-state energy and entanglement entropy, we map the phase diagram for different values of the tunable exponent alpha. Our results demonstrate the efficiency of the GHF method in simulating interacting quantum systems.
Article
Optics
John Drew Wilson, Simon B. Jaeger, Jarrod T. Reilly, Athreya Shankar, Maria Luisa Chiofalo, Murray J. Holland
Summary: The creation and manipulation of quantum entanglement is crucial for improving precision measurements. This study introduces a method that goes beyond one-axis twisting to generate squeezing and entanglement across two distinct degrees of freedom. By using a nonlinear Hamiltonian to generate dynamics in SU(4), more rich context of quantum entanglement is achieved.
Article
Optics
Jarrod T. Reilly, Simon B. Jaeger, John Cooper, Murray J. Holland
Summary: This study proposes a method to adiabatically control an atomic ensemble using a decoherence-free subspace (DFS) within a dissipative cavity. By interfering the emission amplitude of the ensemble with an injected field, a specific eigenstate of the system's Lindblad jump operators can be engineered. Unlike previous adiabatic DFS proposals, this scheme allows for the creation of a DFS in the presence of collective decoherence, enabling faster state preparation.
Article
Optics
Gage W. Harmon, Jarrod T. Reilly, Murray J. Holland, Simon B. Jaeger
Summary: The study presents a theoretical description of a lasing scheme for atoms with three internal levels in a V configuration interacting with an optical cavity, demonstrating a closed lasing cycle on a dipole-forbidden transition. Utilizing stability analysis and mean-field Floquet method, the lasing threshold, emission frequency, and bistable solutions are determined. The research sheds light on the complex physics of cold atom lasers with narrow line transitions through simple methods.
Article
Physics, Multidisciplinary
John P. Bartolotta, Simon B. Jager, Jarrod T. Reilly, Matthew A. Norcia, James K. Thompson, Graeme Smith, Murray J. Holland
Summary: In the field of light-matter interactions, it is commonly assumed that classical light fields interacting with quantum particles undergo negligible changes and do not contain information about the particles. This study develops a Gedanken experiment to investigate the validity of this assumption, quantifying the alteration of the light field and the transfer of entropy using Bayesian inference. The results show that in the strong coupling limit, information about the particle state can be fully encoded in the light field.
PHYSICAL REVIEW RESEARCH
(2022)
Article
Optics
Peter-Maximilian Ney, Simone Notarnicola, Simone Montangero, Giovanna Morigi
Summary: This study investigates the quantum dynamics of a spin chain that simulates Conway's Game of Life. By solving the time-dependent Schrodinger equation for separable initial states, the evolution of quantum correlations across the lattice is analyzed. Examples of evolutions resulting in entangled chains or oscillating entangling structures are reported and characterized using entanglement and network measures. The quantum patterns exhibit structures that differ significantly from classical ones, even in the dynamics of local observables. A notable example is a structure that behaves as a quantum analog of a blinker, but does not have a classical counterpart.
Article
Optics
Tom Schmit, Luigi Giannelli, Anders S. Sorensen, Giovanna Morigi
Summary: This study analyzes the spectral properties of optical photons emitted by solid-state quantum memory and the relationship between stored and retrieved excitations. The results can be applied to optical-to-optical and microwave-to-optical transducers working over a wide range of frequencies. The efficiency of the solid-state quantum transducer depends on the design of the retrieval process in relation to the storage dynamics.
Article
Physics, Fluids & Plasmas
Frederic Folz, Kurt Mehlhorn, Giovanna Morigi
Summary: The study examines the dynamics of a simple adaptive system under noise and periodic damping. Different responses are identified depending on the modulation frequency and noise amplitude. At lower frequencies, the system tends to switch to the path with minimal dissipation.
Article
Materials Science, Multidisciplinary
Piotr Kubala, Piotr Sierant, Giovanna Morigi, Jakub Zakrzewski
Summary: The analysis of the extended Bose-Hubbard model with quasiperiodic infinite-range interactions reveals that a significant fraction of eigenstates becomes localized as the strength of the global interactions is increased. The behavior scales differently depending on the choice of the thermodynamic limit. The system is asymptotically ergodic by scaling the interaction strength to keep the energy extensive, while the MBL regime appears to be stable with superextensive scaling of the energy, which can be experimentally verified in cavity quantum electrodynamics setups through quench spectroscopy.