Complex Langevin and other approaches to the sign problem in quantum many-body physics
Sign Up to like & getrecommendations! Published in 2021 at "Physics Reports"
DOI: 10.1016/j.physrep.2020.09.002
Abstract: We review the theory and applications of complex stochastic quantization to the quantum many-body problem. Along the way, we present a brief overview of a number of ideas that either ameliorate or in some cases… read more here.
Keywords: many body; physics; problem; sign problem ... See more keywords
Experimental characterization of a quantum many-body system via higher-order correlations
Sign Up to like & getrecommendations! Published in 2017 at "Nature"
DOI: 10.1038/nature22310
Abstract: Quantum systems can be characterized by their correlations. Higher-order (larger than second order) correlations, and the ways in which they can be decomposed into correlations of lower order, provide important information about the system, its… read more here.
Keywords: order; system; quantum many; many body ... See more keywords
One-dimensional quantum many body systems with long-range interactions
Sign Up to like & getrecommendations! Published in 2019 at "Journal of Physics A: Mathematical and Theoretical"
DOI: 10.1088/1751-8121/ab5634
Abstract: The presence of algebraically decaying long-range interactions may alter the critical as well as topological behaviour of a quantum many-body systems. However, when the interaction decays at a faster rate, the short-range behaviour is expected… read more here.
Keywords: many body; quantum many; body systems; range interactions ... See more keywords
Fast computation of spherical phase-space functions of quantum many-body states
Sign Up to like & getrecommendations! Published in 2020 at "Physical Review A"
DOI: 10.1103/physreva.102.062421
Abstract: Quantum devices are preparing increasingly more complex entangled quantum states. How can one effectively study these states in light of their increasing dimensions? Phase spaces such as Wigner functions provide a suitable framework. We focus… read more here.
Keywords: phase; quantum many; many body; phase space ... See more keywords
Spontaneous symmetry breaking in nonsteady modes of open quantum many-body systems
Sign Up to like & getrecommendations! Published in 2022 at "Physical Review A"
DOI: 10.1103/physreva.107.052208
Abstract: In a quantum many-body system coupled to the environment, its steady state can exhibit spontaneous symmetry breaking when a control parameter exceeds a critical value. In this study, we consider spontaneous symmetry breaking in non-steady… read more here.
Keywords: many body; spontaneous symmetry; quantum many; symmetry breaking ... See more keywords
Hidden order in quantum many-body dynamics of driven-dissipative nonlinear photonic lattices
Sign Up to like & getrecommendations! Published in 2019 at "Physical Review A"
DOI: 10.1103/physreva.99.043808
Abstract: We study the dynamics of nonlinear photonic lattices driven by two-photon parametric processes. By means of matrix-product-state--based calculations, we show that a quantum many-body state with long-range hidden order can be generated from the vacuum.… read more here.
Keywords: many body; photonic lattices; order; hidden order ... See more keywords
Quantum many-body scars from magnon condensation
Sign Up to like & getrecommendations! Published in 2019 at "Physical Review B"
DOI: 10.1103/physrevb.100.184312
Abstract: We study the eigenstate properties of a nonintegrable spin chain that was recently realized experimentally in a Rydberg-atom quantum simulator. In the experiment, long-lived coherent many-body oscillations were observed only when the system was initialized… read more here.
Keywords: scars magnon; many body; scarred eigenstates; body scars ... See more keywords
Approximating power of machine-learning ansatz for quantum many-body states
Sign Up to like & getrecommendations! Published in 2020 at "Physical Review B"
DOI: 10.1103/physrevb.101.195141
Abstract: An artificial neural network (ANN) with the restricted Boltzmann machine (RBM) architecture was recently proposed as a versatile variational quantum many-body wave function. In this work we provide physical insights into the performance of this… read more here.
Keywords: many body; performance; machine; rbm ... See more keywords
Collapse and revival of quantum many-body scars via Floquet engineering
Sign Up to like & getrecommendations! Published in 2020 at "Physical Review B"
DOI: 10.1103/physrevb.101.245107
Abstract: The presence of quantum scars, athermal eigenstates of a many-body Hamiltonian with finite energy density, leads to absence of ergodicity and long-time coherent dynamics in closed quantum systems starting from simple initial states. Such non-ergodic… read more here.
Keywords: many body; quantum many; collapse revival; coherent dynamics ... See more keywords
Quantum many-body simulations of the two-dimensional Fermi-Hubbard model in ultracold optical lattices
Sign Up to like & getrecommendations! Published in 2021 at "Physical Review B"
DOI: 10.1103/physrevb.103.l041107
Abstract: Understanding quantum many-body states of correlated electrons is one main theme in modern condensed matter physics. Given that the Fermi-Hubbard model, the prototype of correlated electrons, has been recently realized in ultracold optical lattices, it… read more here.
Keywords: many body; hubbard model; optical lattices; ultracold optical ... See more keywords
Prominent quantum many-body scars in a truncated Schwinger model
Sign Up to like & getrecommendations! Published in 2022 at "Physical Review B"
DOI: 10.1103/physrevb.107.205112
Abstract: The high level of control and precision achievable in current synthetic quantum matter setups has enabled first attempts at quantum-simulating various intriguing phenomena in condensed matter physics, including those probing thermalization or its absence in… read more here.
Keywords: many body; quantum many; body scars; model ... See more keywords