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Many-particle Dephasing after a Quantum Quench

May 21, 2019 - 11:00am
Speaker: 
Dr. Lingzhen Guo
Institution: 
Max Planck Institute for the Science of Light (MPL), Erlangen, Germany

After a quench in a quantum many-body system, expectation values tend to relax towards long-time averages. However, temporal fluctuations remain in the long-time limit, and it is crucial to study the suppression of these fluctuations with increasing system size. For nonintegrable models, e.g., the transverse Ising chain beyond nearest-neighbour coupling, we show that the temporal fluctuations are exponentially suppressed by the system size, due to a newly discovered phenomenon (’many-body dephasing’). We propose that a chain of 5 trapped ions can be used to observe persistent temporal fluctuations after a quench. By fitting the experimental data, we will analyse the noises in the experiments and show the possibility to observe  the universal persistent nonequilibrium behaviour after a quench.

Host: Guido Pagano

PSC 2136
20742