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Bright Telecom-Wavelength Single Photons Based on a Tapered Nanobeam.
Chang-Min Lee1, Mustafa Atabey Buyukkaya1, Samuel Harper1
1Department of Electrical and Computer Engineering and Institute for Research in Electronics and Applied Physics, University of Maryland, College Park, Maryland 20742, United States.
Nano Letters
|December 18, 2020
Summary
We developed a bright and pure single photon source for telecom wavelengths using InAs/InP quantum dots in a tapered nanobeam. This breakthrough advances practical fiber-based quantum networks.
Area of Science:
- Quantum Optics
- Materials Science
- Nanotechnology
Background:
- Telecom-wavelength single photons are crucial for long-distance quantum networks.
- Achieving bright and pure single photon sources at telecom wavelengths is a significant challenge.
Purpose of the Study:
- To demonstrate a bright and pure single photon source at telecom wavelengths.
- To improve the efficiency and coherence of single photon emission for quantum networks.
Main Methods:
- Utilized InAs/InP quantum dots integrated into a tapered nanobeam structure.
- Employed above-band and quasi-resonant excitation techniques.
- Characterized photon emission brightness, purity, and coherence time.
Main Results:
- Achieved a first-lens brightness of 27.0 ± 0.1% at ~1300 nm using above-band excitation.
- Obtained a coherence time of 523 ± 16 ps and Hong-Ou-Mandel visibility of 0.91 ± 0.09 with quasi-resonant excitation.
- Demonstrated a practical fiber-based single photon source with high performance.
Conclusions:
- The tapered nanobeam enhances directional and Gaussian-like emission from quantum dots.
- The developed source is a significant advancement for practical fiber-based quantum networks.
- This work paves the way for robust long-distance quantum communication.
