2019/03/31 by Bin Yan, Lukasz Cincio, Wojciech H. Zurek · 2 citations
Physics and Astronomy · #quant-ph
paper · pdf · doi:10.1103/physrevlett.124.160603
published as Phys. Rev. Lett. 124, 160603 (2020) · V4: final version for publication; improved presentation; 6+8 pages, 5 figures. V3: a major improvement of an already good paper
arxiv created 2020/04/24 · arxiv updated 2020/04/28
We demonstrate analytically and verify numerically that the out-of-time order correlator is given by the thermal average of Loschmidt echo signals. This provides a direct link between the out-of-time-order correlator -- a recently suggested measure of information scrambling in quantum chaotic systems -- and the Loschmidt echo, a well-appreciated familiar diagnostic that captures the dynamical aspect of chaotic behavior in the time domain, and is accessible to experimental studies.