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International Journal of Theoretical Physics

Entanglement and Output Squeezing of Distant Optomechanical Systems Generated by Four-Level Atoms

Guixia Pan, Ruijie Xiao, Juan Gao

Published Mar 11, 2020• 0 citations
Publisher
DOI
10.1007/s10773-020-04411-6

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Abstract A scheme is addressed to generate the macroscopic entanglement and the output squeezing of optomechanical system with a single four-level atom. Applying the logarithmic negativity to measure entanglement, we analyze the effect of the coupling strength between the cavity and the atom on the entanglement of the cavity and the movable mirror. It is found that the robustness of the entanglement is enhanced with increasing of atom-cavity coupling, and the entanglement has a valley around when Δ is equal to ω m . Furthermore, we also analyze the output entanglement. The results show that the frequency of the mirror oscillation and the Rabi frequency of laser field affect the output squeezing spectrum.
Abstract We investigate the entanglement phenomena assisted by a distant nono-electro-optomechanical system with two optical parametric amplifiers. The system consists of two optomechanical cavities coupling to two charged mechanical resonators via Coulomb interaction. Under suitable conditions, the movable mirrors and the two distant cavity fields can exhibit entanglement. The entanglement is strongly manipulated by the parametric gain and the Coulomb coupling. Furthermore, because of the introduction of the charged mechanical oscillators, the entanglement between the two cavity modes and between the movable mirrors displays a splitting phenomenon. We also study the squeezing spectrum of the cavity fields. The results reveal that the output squeezing of the two cavity fields is affected by the frequency of the mirror oscillation and the parametric gain.