Zhou Jian-Yong, Zhou Yue-Hui, Yin Xian-Li, Huang Jin-Feng, Liao Jie-Qiao
Department of Physics and Synergetic Innovation Center for Quantum Effects and Applications, Hunan Normal University, Changsha, 410081, China.
Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education, Hunan Normal University, Changsha, 410081, China.
Sci Rep. 2020 Jul 28;10(1):12557. doi: 10.1038/s41598-020-68309-3.
We study the effect of quantum entanglement maintained by virtual excitations in an ultrastrongly-coupled harmonic-oscillator system. Here, the quantum entanglement is caused by the counterrotating interaction terms and hence it is maintained by the virtual excitations. We obtain the analytical expression for the ground state of the system and analyze the relationship between the average excitation numbers and the ground-state entanglement. We also study the entanglement dynamics between the two oscillators in both the closed- and open-system cases. In the latter case, the quantum master equation is microscopically derived in the normal-mode representation of the coupled-oscillator system. This work will open a route to the study of quantum information processing and quantum physics based on virtual excitations.
我们研究了在超强耦合谐振子系统中由虚激发维持的量子纠缠的效应。在此，量子纠缠由反向旋转相互作用项引起，因此它由虚激发维持。我们得到了该系统基态的解析表达式，并分析了平均激发数与基态纠缠之间的关系。我们还研究了封闭和开放系统情况下两个振子之间的纠缠动力学。在后一种情况下，在耦合振子系统的正则模表示中微观推导了量子主方程。这项工作将为基于虚激发的量子信息处理和量子物理研究开辟一条途径。
