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Chin. Phys. B, 2017, Vol. 26(6): 060303    DOI: 10.1088/1674-1056/26/6/060303
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Generating EPR-entangled mechanical state via feeding finite-bandwidth squeezed light

Cheng-qian Yi(伊程前), Zhen Yi(伊珍), Wen-ju Gu(谷文举)
Institute of Quantum Optics and Information Photonics, School of Physics and Optoelectronic Engineering, Yangtze University, Jingzhou 434023, China
Abstract  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.
Keywords:  EPR-entangled mechanical state      finite-bandwith squeezed light      squeezing transfer  
Received:  19 December 2016      Revised:  20 March 2017      Published:  05 June 2017
PACS:  03.65.Ud (Entanglement and quantum nonlocality)  
  42.50.Pq (Cavity quantum electrodynamics; micromasers)  
  42.50.Wk (Mechanical effects of light on material media, microstructures and particles)  
Fund: Projects supported by the National Natural Science Foundation of China (Grant Nos. 61505014 and 11504031), the Yangtze Youth Talents Fund, and the Yangtze Funds for Youth Teams of Science and Technology Innovation (Grant No. 2015cqt03).
Corresponding Authors:  Zhen Yi     E-mail:  yizhen@yangtzeu.edu.cn

Cite this article: 

Cheng-qian Yi(伊程前), Zhen Yi(伊珍), Wen-ju Gu(谷文举) Generating EPR-entangled mechanical state via feeding finite-bandwidth squeezed light 2017 Chin. Phys. B 26 060303

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