Quantum entanglement maintained by virtual excitations in an ultrastrongly-coupled-oscillator system
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 expr...
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| Veröffentlicht in: | Scientific reports 2020-07, Vol.10 (1), p.12557-12557, Article 12557 |
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| creator | Zhou, Jian-Yong Zhou, Yue-Hui Yin, Xian-Li Huang, Jin-Feng Liao, Jie-Qiao |
| description | 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. |
| doi_str_mv | 10.1038/s41598-020-68309-3 |
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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. 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| subjects | 639/624/400/482 639/766/483 Approximation Humanities and Social Sciences Information processing Laboratories multidisciplinary Multidisciplinary Sciences Oscillators Parity Physics Science Science & Technology Science & Technology - Other Topics Science (multidisciplinary) |
| title | Quantum entanglement maintained by virtual excitations in an ultrastrongly-coupled-oscillator system |
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