Journal
NANO LETTERS
Volume 21, Issue 1, Pages 323-329Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.0c03680
Keywords
single photon sources; quantum dots; telecom wavelength; two-photon interference
Categories
Funding
- National Science Foundation [OMA1936314]
- Army Research Office [W911NF1910378]
- Office of Naval Research [N00014172720, N000142012551]
- Center for Distributed Quantum Information at the University of Maryland and Army Research Laboratory
- Maryland-ARL Quantum Partnership
- U.S. Department of Defense
- U.S. Department of Defense (DOD) [W911NF1910378, N000142012551] Funding Source: U.S. Department of Defense (DOD)
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In this study, a bright telecom-wavelength single photon source is demonstrated 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, resulting in a high-end brightness. Adopting quasi-resonant excitation helps reduce multiphoton emission and decoherence, achieving a coherence time and postselected Hong-Ou-Mandel visibility suitable for long-distance quantum networks.
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.
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