Measuring continuous-variable quantum entanglement with parametric-amplifier-assisted homodyne detection
Measuring continuous-variable quantum entanglement with parametric-amplifier-assisted homodyne detection
复制标题
用参量放大器辅助零差检测测量连续可变量子纠缠
DOI：
10.1103/physreva.101.053801
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发表时间：
2018-08
影响因子：
2.9
通讯作者：
Z. Y. Ou
中科院分区：
文献类型：
--
作者：
Jiamin Li;Yuhong Liu;Nan Huo;Liang Cui;Sheng Feng;Xiaoying Li;Z. Y. Ou
传统的连续变量量子纠缠测量方法依赖于平衡同差检测，由于探测器的量子效率和被检测场与本振模不匹配等多种因素导致了真空量子噪声的耦合损耗，平衡同差检测对真空量子噪声非常敏感。本文提出并分析了一种新的测量方法，该方法是利用高增益相敏参数放大器辅助平衡差检测实现的。采用高增益参数放大器有助于解决由检测损耗引起的真空量子噪声。此外，由于高增益参数放大器可以以相敏方式耦合两个不同类型的场，因此该方案仅使用一次平衡同差检测就可以显示两个不同类型场之间的量子纠缠。此外，详细分析表明，在多模式情况下，该方案也优于传统方法。这种新的测量方法在量子信息和涉及连续变量测量的量子计量学中具有广泛的应用前景。
Traditional method for measuring continuous-variable quantum entanglement relies on balanced homodyne detections, which are sensitive to vacuum quantum noise coupled in through losses resulted from many factors such as detector's quantum efficiency and mode mismatching between detected field and local oscillator. In this paper, we propose and analyze a new measurement method, which is realized by assisting the balanced homodyne detections with a high gain phase sensitive parametric amplifier. The employment of the high gain parametric amplifier helps to tackle the vacuum quantum noise originated from detection losses. Moreover, because the high gain parametric amplifier can couple two fields of different types in a phase sensitive manner, the proposed scheme can be used to reveal quantum entanglement between two fields of different types by using only one balanced homodyne detection. Furthermore, detailed analysis shows that in the multi-mode case, the proposed scheme is also advantageous over the traditional method. Such a new measurement method should find wide applications in quantum information and quantum metrology involving measurement of continuous variables.
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