期刊
PHYSICAL REVIEW LETTERS
卷 125, 期 12, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.125.120605
关键词
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资金
- National Science Foundation (NSF) Practical Fully-Connected Quantum Computer (PFCQC) STAQ program
- Air Force Office of Scientific Research (AFOSR) Multidisciplinary University Research Initiatives (MURI) on Quantum Measurement and Verification (QM&V) and Dissipatively Stabilized Qubits and Materials
- Defense Advanced Research Projects Agency (DARPA) program on Driven and Nonequilibrium Quantum Systems (DRINQS)
- Department of Energy (DOE) BES Materials and Chemical Sciences for Quantum Information Science program [DE-FOA0001909]
- DOE HEP QuantISED Program [DE-FOA0001893]
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 Letter, we analyze and observe 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. 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 for the long-time nonintegrable dynamics. The analytical expression for the temporal fluctuations predicts the exponential suppression of temporal fluctuations with increasing system size. Our measurement data is consistent with our theory predicting the regime of many-body dephasing.
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