Generating EPR-entangled mechanical state via feeding finite-bandwidth squeezed light

• 来源期刊: 中国物理B（英文版）
• 关键词: EPR-entangled mechanical state finite-bandwith squeezed light squeezing transfer
• 年，卷（期）: 2017,（6）
• 页码范围: 31-36
• 页数: 6页
• 语种: 英文
• DOI: 10.1088/1674-1056/26/6/060303

摘要

Einstein-Podolski-Rosen (EPR) entanglement state is achievable by combining two single-mode position and momentum squeezed states at a 50∶50 beam-splitter (BS).We investigate the generation of the EPR entangled state of two vibrating membranes in a ring resonator,where clockwise (CW) and counter-clockwise (CCW) travelling-wave modes are driven by lasers and finite-bandwidth squeezed lights.Since the optomechanical coupling depends on the location of the membranes,CW and CCW can couple to the symmetric and antisymmetric combination of mechanical modes for a suitable arrangement,which corresponds to a 50∶50 BS mixing.Moreover,by employing the red-detuned driving laser and tuning the central frequency of squeezing field blue detuned from the driving laser with a mechanical frequency,the squeezing property of squeezed light can be perfectly transferred to the mechanical motion in the weak coupling regime.Thus,the BS mixing modes can be position and momentum squeezed by feeding the appropriate squeezed lights respectively,and the EPR entangled mechanical state is obtained.Moreover,cavity-induced mechanical cooling can further suppress the influence of thermal noise on the entangled state.