A Pure and Indistinguishable Single-Photon Source at Telecommunication Wavelength
A Pure and Indistinguishable Single-Photon Source at Telecommunication Wavelength
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DOI：
10.1002/qute.202200006
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发表时间：
2022-03-25
影响因子：
4.4
通讯作者：
Midolo, Leonardo
中科院分区：
文献类型：
--
作者：
Da Lio, Beatrice;Faurby, Carlos;Midolo, Leonardo
按需单光子源在电信波长处发射纯的和不可区分的光子，是部署基于光纤的量子网络的关键资产。事实上，单光子可以作为飞行量子比特，允许长距离的量子信息通信。嵌入GaAs中的自组装InAs量子点构成了高质量单光子的优良的几乎确定性源，但绝大多数源在900-950 nm波长范围内工作，排除了它们在量子网络中的采用。本文提出了一种量子频率转换方案，用于将单光子从量子点转换到约1550 nm的电信C波段，实现40.8%的端到端效率，同时在转换期间保持高纯度和高程度的不可分辨性，测量值g（（2））（0）= 2.4%和V-（corr）= 94.8%。
On-demand single-photon sources emitting pure and indistinguishable photons at the telecommunication wavelength are critical assets toward the deployment of fiber-based quantum networks. Indeed, single photons may serve as flying qubits, allowing communication of quantum information over long distances. Self-assembled InAs quantum dots embedded in GaAs constitute an excellent nearly deterministic source of high-quality single photons, but the vast majority of sources operate in the 900-950 nm wavelength range, precluding their adoption in a quantum network. A quantum frequency conversion scheme is presented here for converting single photons from quantum dots to the telecommunication C band, around 1550 nm, achieving 40.8% end-to-end efficiency, while maintaining both high purity and a high degree of indistinguishability during conversion with measured values of g((2))(0) = 2.4% and V-(corr) = 94.8%, respectively.