We present a theoretical scheme for the enhancement of entanglement between the two distant mechanical resonators in a hybrid optomechanical system which is composed of a single-mode optomechanical cavity with an atomic ensemble of two-level atoms and two mechanical resonators coupled via Coulomb field. Our results show that the atomic detuning, collective atomic coupling and Coulomb interaction play a vital role in obtaining the enhanced entanglement between the two distant mechanical resonators. We can interplay these controlling parameters to obtain optimal entanglement for the system. Interestingly, the numerical simulation result reveals that such bi-partite entanglement persists for bath temperature up to 600 K. In the end, we show that the system’s interaction with the atomic ensemble lead to an enhanced entanglement spectrum, which is robust against bath temperature as well. The present scheme will open new perspectives in constructing entanglement between two distant resonators and helpful to realize quantum memories for the continuous-variable quantum information processing.

Enhancement of mechanical entanglement in hybrid optomechanical system

We present a novel quantum phenomenon named electromagnetically induced entanglement in the conventional Lambda-type three-level atomic system driven by a strong pump field and a relatively weak probe field. Nearly perfect entanglement between the pump and probe fields can be achieved with a low coherence decay rate between the two lower levels, high pump-field intensity, and large optical depth of the atomic ensemble. The physical origin is quantum coherence between the lower doublet produced by the pump and probe fields, similar to the well-known electromagnetically induced transparency. This method would greatly facilitate the generation of nondegenerate narrow-band continuous-variable entanglement between bright light beams by using only coherent laser fields, and may find potential and broad applications in realistic quantum information processing.

Electromagnetically Induced Entanglement

We present a proposal to generate quintupartite entanglement with an optomechanical dual-cavity containing an ensemble of Λ-type three-level atoms. By solving the Heisenberg-Langevin equations, we ...

Generation of quintupartite entanglement with an atom-assisted dual-cavity optomechanical system

Mirrors–light–atoms entanglement in ring optomechanical cavity

We present a scheme to greatly enhance tripartite entanglement in an atom-optomechanical hybrid system driven by a single input laser field. The enhancement of the tripartite entanglement among two longitudinal cavity modes and a mirror oscillation mode is realized via atomic coherence when the cavity free spectral range is about equal to twice the frequency of mechanical oscillation and both cavity modes are blue-detuned by the mechanical frequency to the respective atomic resonant transitions while keeping the two-photon resonance satisfied. Moreover, the entanglement between the two cavity modes exhibits robustness to the variation of the environment temperature. The present atom-assisted optomechanical system provides an alternative platform for the quantum state exchange between light and light, as well as light and matter.

Enhanced tripartite entanglement via atomic coherence in atom-optomechanical system

We present a scheme to significantly enhance multipartite entanglement with an atom-assisted single-cavity optomechanical system. By embedding an ensemble of Λ-type three-level atoms into the cavity, the stationary tripartite entanglement among two longitudinal cavity modes and a mirror oscillation mode can be greatly enhanced due to quantum coherence induced between the two lower atomic states when one (another) cavity mode is driven at the red (blue) mechanical sideband, and both cavity modes are blue-detuned by the mechanical frequency to the respective atomic resonant transitions; moreover, strong light–light–atom–mirror quadripartite entanglement can also be obtained. The present hybrid system can serve as a promising platform for realizing various quantum protocols, and may find potential applications in quantum information processing and quantum networks.

https://iopscience.iop.org/article/10.1088/1361-6455/aadf4b/pdf

Enhanced multipartite entanglement via quantum coherence with an atom-assisted optomechanical system

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Enhanced multipartite entanglement via quantum coherence with an atom-assisted optomechanical system