Laser & Optoelectronics Progress, Volume. 57, Issue 1, 012701(2020)
Long-Range Quantum Coherenceand Quantum Phase Transition in Atom-Microcavity Coupled System
In this study, the quantum simulation of the Heisenberg spin XY model is realized by obtaining the effective Hamiltonian of the atom-microcavity coupled systems via adiabatic approximation. Further, the quantum coherence between any two-body quantum systems is analyzed based on the criterion of relative entropy to obtain quantum resources. The long-range quantum coherence decreases exponentially with increasing the two-body spacing. Furthermore, when the system parameters are varied, it is found that there is a numerical mutation in the long-range quantum coherence near the quantum critical point, which provides a possible order parameter for characterizing the quantum phase transition. After considering the influence of external light-field noise on the quantum coherence, it is found that the quantum coherence decays with time and gradually disappears.
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Zhiyuan Yang, Yating Shao, Quanying Wu, Xiang Hao. Long-Range Quantum Coherenceand Quantum Phase Transition in Atom-Microcavity Coupled System[J]. Laser & Optoelectronics Progress, 2020, 57(1): 012701
Category: Quantum Optics
Received: Jun. 4, 2019
Accepted: Jul. 10, 2019
Published Online: Jan. 3, 2020
The Author Email: Hao Xiang (xhao@mail.usts.edu.cn)