Many-particle Dephasing after a Quantum Quench
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