An efficient source of frequency anti-correlated entanglement at telecom wavelength
An efficient source of frequency anti-correlated entanglement at telecom wavelength
复制标题
电信波长频率反相关纠缠的有效来源
DOI：
10.1007/s00340-016-6402-3
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发表时间：
2016-04
期刊：
影响因子：
--
通讯作者：
Dong, Ruifang
中科院分区：
文献类型：
--
作者：
Wang, Shaofeng;Liu, Tao;Zhang, Shougang;Dong, Ruifang
我们证明了在电信波长有效地产生频率反相关纠缠光子对。基础激光器为1560 nm的连续波高功率光纤激光器，通过外腔倍频系统实现功率高达742 mW的780 nm泵浦。通过周期性极化的KTiOPO4 （PPKTP）晶体后，产生简并的下转换光子对。检测效率为14.8%，单光子计数率为370 kHz，光子对重合率为22 kHz。信号光子和空闲光子的光谱以1560.23和1560.04 nm为中心，其3-dB带宽均为3.22 nm。观察到光子对的联合光谱具有频率反相关，光谱带宽为0.52 nm。根据单光子频谱带宽与光子对联合频谱带宽之比，将频率纠缠度量化为6.19。基于Hong-Ou-Mandel干涉重合测量，证明了95%的频率不可分辨性。结果表明，光纤激光器中固有的额外强度噪声对产生的光子对的频率纠缠影响很小。
We demonstrate an efficient generation of frequency anti-correlated entangled photon pairs at telecom wavelength. The fundamental laser is a continuous-wave high-power fiber laser at 1560 nm, through an extracavity frequency doubling system, a 780-nm pump with a power as high as 742 mW is realized. After single-passing through a periodically poled KTiOPO4 (PPKTP) crystal, degenerate down-converted photon pairs are generated. With an overall detection efficiency of 14.8 %, the count rates of the single photons and coincidence of the photon pairs are measured to be 370 kHz and 22 kHz, respectively. The spectra of the signal and idler photons are centered at 1560.23 and 1560.04 nm, while their 3-dB bandwidths being 3.22 nm both. The joint spectrum of the photon pair is observed to be frequency anti-correlated and have a spectral bandwidth of 0.52 nm. According to the ratio of the single-photon spectral bandwidth to the joint spectral bandwidth of the photon pairs, the degree of frequency entanglement is quantified to be 6.19. Based on a Hong–Ou–Mandel interferometric coincidence measurement, a frequency indistinguishability of 95 % is demonstrated. The good agreements with the theoretical estimations show that the inherent extra intensity noise in fiber lasers has little influence on frequency entanglement of the generated photon pairs.
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