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Enhanced Entanglement in Hybrid Cavity Mediated by a Two-way Coupled Quantum Dot

Enhanced Entanglement in Hybrid Cavity Mediated by a Two-way Coupled Quantum Dot AbstractWe investigate theoretically the entanglement in a hybrid Fabry-Perot cavity system. A membrane in the cavity acts as a mechanical resonator, and a two-level quantum dot is coupled to both the cavity mode and the mechanical resonator. The entanglements between the cavity field and the mechanical resonator, between the mechanical resonator and the quantum dot, as well as between the cavity field and the quantum dot are observed. The logarithmic negativities in the first two subsystems are much larger than those in the system without two-way coupled quantum dot, and the entanglements are robust against the thermal temperature (entanglements still exist in tens of Kelvin). We also find that without direct coupling between the cavity field and the mechanical resonator, one can till observe effective entanglement between them in our system. Our work is helpful and may have potential applications in the research of multipartite entanglement in physical system. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Open Physics de Gruyter

Enhanced Entanglement in Hybrid Cavity Mediated by a Two-way Coupled Quantum Dot

Li, Ming-Cui; Chen, Ai-Xi
Open Physics , Volume 18 (1): 10 – Feb 28, 2020
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References (44)

Publisher
de Gruyter
Copyright
© 2020 M.-C. Li and A.-X. Chen, published by De Gruyter
ISSN
2391-5471
eISSN
2391-5471
DOI
10.1515/phys-2020-0003
Publisher site
See Article on Publisher Site

Abstract

AbstractWe investigate theoretically the entanglement in a hybrid Fabry-Perot cavity system. A membrane in the cavity acts as a mechanical resonator, and a two-level quantum dot is coupled to both the cavity mode and the mechanical resonator. The entanglements between the cavity field and the mechanical resonator, between the mechanical resonator and the quantum dot, as well as between the cavity field and the quantum dot are observed. The logarithmic negativities in the first two subsystems are much larger than those in the system without two-way coupled quantum dot, and the entanglements are robust against the thermal temperature (entanglements still exist in tens of Kelvin). We also find that without direct coupling between the cavity field and the mechanical resonator, one can till observe effective entanglement between them in our system. Our work is helpful and may have potential applications in the research of multipartite entanglement in physical system.

Journal

Open Physics – de Gruyter

Published: Feb 28, 2020

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