Macroscopic quantum entanglement in modulated optomechanics

Abstract

Quantum entanglement in mechanical systems is not only a key signature of macroscopic quantum effects, but has wide applications in quantum technologies. Here we proposed an effective approach for creating strong steady-state entanglement between two directly coupled mechanical oscillators (or a mechanical oscillator and a microwave resonator) in a modulated optomechanical system. The entanglement is achieved by combining the processes of a cavity cooling and the two-mode parametric interaction, which can surpass the bound on the maximal stationary entanglement from the two-mode parametric interaction. In principle, our proposal allows one to cool the system from an initial thermal state to an entangled state with high purity by a monochromatic driving laser. Also, the obtained entangled state can be used to implement the continuous-variable teleportation with high fidelity. Moreover, our proposal is robust against the thermal fluctuations of the mechanical modes under the condition of strong optical pumping.

8 pages, 9 figures

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Cited by in corpus (4)

• Mass sensing by quantum criticality
• Photon-assisted entanglement and squeezing generation and decoherence suppression via a quadratic optomechanical coupling
• Suppressing laser phase noise in an optomechanical system
• Significant enhancement in refrigeration and entanglement in auxiliary-cavity-assisted optomechanical systems