Related Experiment Video
Updated: Feb 6, 2026

Gradient Echo Quantum Memory in Warm Atomic Vapor
Published on: November 11, 2013
Quantum work statistics, Loschmidt echo and information scrambling
A Chenu1,2, I L Egusquiza3, J Molina-Vilaplana4
1Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA, 02139, USA. achenu@mit.edu.
Abstract:
A universal relation is established between the quantum work probability distribution of an isolated driven quantum system and the Loschmidt echo dynamics of a two-mode squeezed state. When the initial density matrix is canonical, the Loschmidt echo of the purified double thermofield state provides a direct measure of information scrambling and can be related to the analytic continuation of the partition function. Information scrambling is then described by the quantum work statistics associated with the time-reversal operation on a single copy, associated with the sudden negation of the system Hamiltonian.
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