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Many-body dephasing in a trapped-ion quantum simulator

MPG-Autoren

Guo,  Lingzhen
Marquardt Division, Max Planck Institute for the Science of Light, Max Planck Society;

/persons/resource/persons201125

Marquardt,  Florian
Marquardt Division, Max Planck Institute for the Science of Light, Max Planck Society;
Physics Department, University of Erlangen-Nuremberg;

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Zitation

Kaplan, H. B., Guo, L., Tan, W. L., De, A., Marquardt, F., Pagano, G., et al. (in press). Many-body dephasing in a trapped-ion quantum simulator. Physical Review Letters, 2001.02477v1.


Zitierlink: https://hdl.handle.net/21.11116/0000-0005-7436-C
Zusammenfassung
How a closed interacting quantum many-body system relaxes and dephases as a function of time is a fundamental question in thermodynamic and statistical physics. In this work, we observe and analyse the persistent temporal fluctuations after a quantum quench of a tunable long-range interacting transverse-field Ising Hamiltonian realized with a trapped-ion quantum simulator. We measure the temporal fluctuations in the average magnetization of a finite-size system of spin-1/2 particles and observe the experimental evidence for the theoretically predicted regime of many-body dephasing. We experiment in a regime where the properties of the system are closely related to the integrable Hamiltonian with global spin-spin coupling, which enables analytical predictions even for the long-time non-integrable dynamics. We find that the measured fluctuations are exponentially suppressed with increasing system size, consistent with theoretical predictions.