Quantum imaginary time evolution steered by reinforcement learning
Sign Up to like & getrecommendations! Published in 2022 at "Communications Physics"
DOI: 10.1038/s42005-022-00837-y
Abstract: The quantum imaginary time evolution is a powerful algorithm for preparing the ground and thermal states on near-term quantum devices. However, algorithmic errors induced by Trotterization and local approximation severely hinder its performance. Here we… read more here.
Keywords: imaginary time; reinforcement learning; quantum imaginary; evolution ... See more keywords
Measuring the imaginary-time dynamics of quantum materials
Sign Up to like & getrecommendations! Published in 2019 at "Philosophical Magazine"
DOI: 10.1080/14786435.2020.1768604
Abstract: ABSTRACT Theoretical analysis typically involves imaginary-time correlation functions. Inferring real-time dynamical response functions from this information is notoriously difficult. However, as we articulate here, it is straightforward to compute imaginary-time correlators from the measured frequency… read more here.
Keywords: dynamics quantum; time dynamics; response; time ... See more keywords
Imaginary Time Crystal of Thermal Quantum Matter
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DOI: 10.1088/0256-307x/37/5/050503
Abstract: Spontaneous symmetry breaking is responsible for rich quantum phenomena from crystalline structures to superconductivity. This concept was boldly extended to the breaking of time translation, opening an avenue to finding exotic phases of quantum matter… read more here.
Keywords: crystal thermal; imaginary time; time crystal; time ... See more keywords
Imaginary-time evolution with quantum nondemolition measurements: Multiqubit interactions via measurement nonlinearities
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DOI: 10.1103/physreva.107.042616
Abstract: We show that quantum nondemolition (QND) measurements can be used to realize measurement-based imaginary time evolution. In our proposed scheme, repeated weak QND measurements are used to estimate the energy of a given Hamiltonian. Based… read more here.
Keywords: imaginary time; time evolution; measurement; quantum nondemolition ... See more keywords
Vacuum decay in real time and imaginary time formalisms
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DOI: 10.1103/physrevd.100.016011
Abstract: We analyze vacuum tunneling in quantum field theory in a general formalism by using the Wigner representation. In the standard instanton formalism, one usually approximates the initial false vacuum state by an eigenstate of the… read more here.
Keywords: imaginary time; time; real time; vacuum ... See more keywords
Parameter-free differential evolution algorithm for the analytic continuation of imaginary time correlation functions.
Sign Up to like & getrecommendations! Published in 2022 at "Physical review. E"
DOI: 10.1103/physreve.106.025312
Abstract: We report on differential evolution for analytic continuation: a parameter-free evolutionary algorithm to generate the dynamic structure factor from imaginary time correlation functions. Our approach to this long-standing problem in quantum many-body physics achieves enhanced… read more here.
Keywords: parameter free; correlation functions; imaginary time; analytic continuation ... See more keywords
Difference between Quantum Annealing by Imaginary-Time and Real-Time Schrödinger Equations of Grover’s Search
Sign Up to like & getrecommendations! Published in 2019 at "Journal of the Physical Society of Japan"
DOI: 10.7566/jpsj.88.024803
Abstract: We confirmed the annealing time required to obtain the desired success probability for quantum annealing by the imaginary-time and real-time Schrodinger equations of Grover’s search, with two kinds... read more here.
Keywords: imaginary time; time; annealing imaginary; real time ... See more keywords