Characterization of frequency entanglement under extended phase-matching conditions
Characterization of frequency entanglement under extended phase-matching conditions
复制标题
扩展相位匹配条件下频率纠缠的表征
DOI：
10.1007/s00340-015-6006-3
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发表时间：
2015-01
影响因子：
2.1
通讯作者：
Dong, Ruifang
中科院分区：
文献类型：
--
作者：
Tai, Zhaoyang;Liu, Tao;Zhang, Shougang;Dong, Ruifang
在扩展相位匹配条件下自发参数下转换过程产生的频率纠缠光子对被发现是量子信息技术的潜在资源。下转换光子对的光谱不可区分性和频率纠缠程度是决定其潜在应用的两个关键特征。本文对这两种品质因数进行了研究。结果表明，脉冲泵浦带宽的加宽、脉冲持续时间的啁啾以及非线性晶体的加长都会降低光谱的不可区分性。此外，通过改变上述条件，可以将纠缠类型从频率相关转变为频率反相关。对于频率相关的纠缠，纠缠的程度与泵浦带宽和非线性晶体长度呈线性增长，与脉冲的线性调频参数呈二次方增长，而对于反相关的频率纠缠，频率纠缠的程度与上述参数成反比。在此类研究的指导下，可以优化各种量子信息应用所需的频率纠缠源的生成。
Frequency-entangled photon pairs generated by spontaneous parametric down-conversion process under extended phase-matching conditions are found to be prospective resources for quantum information technology. The spectral indistinguishability and the degree of frequency entanglement of the down-converted photon pairs are two key features determining their potential applications. In this paper, both figures of merits are investigated. It is shown that the broadening of the pulsed pump bandwidth, the chirping of the pulse duration, and the lengthening of the nonlinear crystal all degrade the spectral indistinguishability. Furthermore, by changing the above conditions, it is possible to transfer the entanglement type from frequency-correlated to frequency-anticorrelated. For frequency-correlated entanglement, the degree of entanglement grows linearly with the pump bandwidth and the nonlinear crystal length, and quadratically with the chirp parameter of the pulse, while for anticorrelated frequency entanglement, the degree of frequency entanglement turns to behave with an inverse dependence on the above parameters. Guided by such investigations, the generation of desired frequency-entangled source for various quantum information applications can be optimized.
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影响因子：
2.6
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DOI：
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