Bright Telecom-Wavelength Single Photons Based on a Tapered Nanobeam
Bright Telecom-Wavelength Single Photons Based on a Tapered Nanobeam
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DOI：
10.1021/acs.nanolett.0c03680
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发表时间：
2021-01-13
期刊：
影响因子：
10.8
通讯作者：
Waks, Edo
中科院分区：
文献类型：
--
作者：
Lee, Chang-Min;Buyukkaya, Mustafa Atabey;Waks, Edo
电信波长单光子是远距离量子网络的重要组成部分。然而，在电信波长上实现明亮和纯净的单光子源仍然具有挑战性。在这里，我们展示了一个基于含有InAs/InP量子点的锥形纳米光束的明亮的电信波长单光子源。锥形纳米光束使量子点的定向和高斯远场发射成为可能。因此，使用带上激发，我们在-1300 nm波长处获得了4.1 +/- 0.1%的端到端亮度和27.0 +/- 0.1%的第一透镜亮度。此外，我们采用准共振激励来减少多光子发射和不需要的载流子的退相干。因此，我们实现了523 +/- 16 ps的相干时间和0。91 +/- 0.09，第一镜头亮度为21.0 +/- 0.1%。这些结果代表了在长距离量子网络中实现实用的基于光纤的电信波长单光子源的重要一步。
Telecom-wavelength single photons are essential components for long-distance quantum networks. However, bright and pure single photon sources at telecom wavelengths remain challenging to achieve. Here, we demonstrate a bright telecom-wavelength single photon source based on a tapered nanobeam containing InAs/InP quantum dots. The tapered nanobeam enables directional and Gaussian-like far-field emission of the quantum dots. As a result, using above-band excitation we obtain an end-to-end brightness of 4.1 +/- 0.1% and first-lens brightness of 27.0 +/- 0.1% at the -1300 nm wavelength. Furthermore, we adopt quasi-resonant excitation to reduce both multiphoton emission and decoherence from unwanted charge carriers. As a result, we achieve a coherence time of 523 +/- 16 ps and postselected Hong-Ou-Mandel visibility of 0 .91 +/- 0.09 along with a comparable first-lens brightness of 21.0 +/- 0.1%. These results represent a major step toward a practical fiber-based single photon source at telecom wavelengths for long-distance quantum networks.