Experimental Measurement of Out-of-Time-Ordered Correlators at Finite Temperature.

Autor:	Green AM; Joint Quantum Institute and Department of Physics, University of Maryland, College Park, Maryland 20742, USA., Elben A; Institute for Quantum Information and Matter and Walter Burke Institute for Theoretical Physics, California Institute of Technology, Pasadena, California 91125, USA.; Center for Quantum Physics, University of Innsbruck, Innsbruck A-6020, Austria.; Institute for Quantum Optics and Quantum Information of the Austrian Academy of Sciences, Innsbruck A-6020, Austria., Alderete CH; Joint Quantum Institute and Department of Physics, University of Maryland, College Park, Maryland 20742, USA., Joshi LK; Center for Quantum Physics, University of Innsbruck, Innsbruck A-6020, Austria.; Institute for Quantum Optics and Quantum Information of the Austrian Academy of Sciences, Innsbruck A-6020, Austria., Nguyen NH; Joint Quantum Institute and Department of Physics, University of Maryland, College Park, Maryland 20742, USA., Zache TV; Center for Quantum Physics, University of Innsbruck, Innsbruck A-6020, Austria.; Institute for Quantum Optics and Quantum Information of the Austrian Academy of Sciences, Innsbruck A-6020, Austria., Zhu Y; Joint Quantum Institute and Department of Physics, University of Maryland, College Park, Maryland 20742, USA., Sundar B; Institute for Quantum Optics and Quantum Information of the Austrian Academy of Sciences, Innsbruck A-6020, Austria.; JILA, Department of Physics, University of Colorado, Boulder, Colorado 80309, USA., Linke NM; Joint Quantum Institute and Department of Physics, University of Maryland, College Park, Maryland 20742, USA.
Jazyk:	angličtina
Zdroj:	Physical review letters [Phys Rev Lett] 2022 Apr 08; Vol. 128 (14), pp. 140601.
DOI:	10.1103/PhysRevLett.128.140601
Abstrakt:	Out-of-time-ordered correlators (OTOCs) are a key observable in a wide range of interconnected fields including many-body physics, quantum information science, and quantum gravity. Measuring OTOCs using near-term quantum simulators will extend our ability to explore fundamental aspects of these fields and the subtle connections between them. Here, we demonstrate an experimental method to measure OTOCs at finite temperatures and use the method to study their temperature dependence. These measurements are performed on a digital quantum computer running a simulation of the transverse field Ising model. Our flexible method, based on the creation of a thermofield double state, can be extended to other models and enables us to probe the OTOC's temperature-dependent decay rate. Measuring this decay rate opens up the possibility of testing the fundamental temperature-dependent bounds on quantum information scrambling.
Databáze:	MEDLINE
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