Phase-sensitive manipulations of the two-mode entangled state by a type-II nondegenerate optical parametric amplifier inside an optical cavity
Phase-sensitive manipulations of the two-mode entangled state by a type-II nondegenerate optical parametric amplifier inside an optical cavity
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DOI：
10.1103/physreva.79.063826
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发表时间：
2009-06-01
影响因子：
2.9
通讯作者：
Zhang, Jing
中科院分区：
文献类型：
--
作者：
Chen, Haixia;Zhang, Jing
从理论上研究了光腔内II类偏振非简并光学参量放大器(NOPA)在不同量子化场(如双模热场、相位共轭态和一对EPR光束在信号频率和空闲频率下)驱动下输出信号和空闲光束的量子涨落和关联。通过扫描NOPA腔的长度，研究了由于输入量子场与NOPA产生的下转换亚谐振场之间的量子干涉而产生的谱线形状。将EPR纠缠光束作为信号光束和闲置光束注入NOPA可以增加或降低纠缠度，这是通过控制NOPA的泵浦光束和注入光束之间的相对相位来实现的。结果证明了NOPA在量子区域的相干现象，并显示了用于量子信息处理的量子纠缠的相敏操作。
The quantum fluctuations and correlations of the output signal and idler beams from a type-II polarization nondegenerate optical parametric amplifier (NOPA) inside an optical cavity are investigated theoretically, which is driven by the different kinds of quantized fields such as the two-mode thermal field, the phase-conjugate state, and a pair of EPR beams at the signal and idler frequency. Spectral line shapes due to quantum interferences between the input quantum fields and the generated down-converted subharmonic fields of NOPA are studied by scanning the length of the NOPA cavity. The entanglement degree of the EPR entangled beams injected into the NOPA as signal and idler beams can be increased or decreased, which are realized by controlling the relative phase between the pump beam and the injected beams for the NOPA. The results demonstrate coherent phenomena of NOPA in the quantum regime and show phase-sensitive manipulations of quantum entanglement for quantum information processing.