通过非简并光学参量放大器实验产生6分贝连续变量纠缠。

Experimental generation of 6 dB continuous variable entanglement from a nondegenerate optical parametric amplifier.

作者信息

Wang Yu, Shen Heng, Jin Xiaoli, Su Xiaolong, Xie Changde, Peng Kunchi

机构信息

State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Opto-Electronics, Shanxi University, Taiyuan, 030006, People's Republic of China.

出版信息

Opt Express. 2010 Mar 15;18(6):6149-55. doi: 10.1364/OE.18.006149.

DOI:10.1364/OE.18.006149

PMID:20389637

Abstract

We experimentally demonstrated that the quantum correlations of amplitude and phase quadratures between signal and idler beams produced from a non-degenerate optical parametric amplifier (NOPA) can be significantly improved by using a mode cleaner in the pump field and reducing the phase fluctuations in phase locking systems. Based on the two technical improvements the quantum entanglement measured with a two-mode homodyne detector is enhanced from approximately 4 dB to approximately 6 dB below the quantum noise limit using the same NOPA and nonlinear crystal.

摘要

我们通过实验证明，在泵浦场中使用模式清洁器并减少锁相系统中的相位波动，可以显著改善非简并光学参量放大器（NOPA）产生的信号光和闲频光之间幅度和相位正交的量子关联。基于这两项技术改进，使用相同的NOPA和非线性晶体，用双模零差探测器测量的量子纠缠从低于量子噪声极限约4 dB提高到约6 dB。