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Quantum Frequency Conversion of a Quantum Dot Single-Photon Source on a Nanophotonic Chip
Anshuman Singh1,2, Qing Li1,2, Shunfa Liu3
1National Institute of Standards and Technology, Gaithersburg, MD 20899, USA.
Optica
|March 18, 2024
Summary
This study demonstrates on-chip quantum frequency conversion for quantum dot single-photon sources, enabling identical photon sources for quantum information science by overcoming wavelength distribution issues.
Area of Science:
- Quantum Information Science
- Nanophotonics
- Semiconductor Quantum Dots
Background:
- Self-assembled Indium Arsenide/Gallium Arsenide (InAs/GaAs) quantum dots are promising single-photon sources.
- Inhomogeneous broadening of quantum dot emission wavelengths hinders the creation of identical sources for quantum applications.
- Quantum frequency conversion offers a solution, especially with scalable chip-integrated technologies.
Purpose of the Study:
- To demonstrate quantum frequency conversion of a quantum dot single-photon source on a silicon nanophotonic chip.
- To overcome the limitations of wavelength distribution in quantum dot emission.
- To enable the creation of multiple identical quantum dot single-photon sources.
Main Methods:
- Integration of a quantum dot single-photon source within a micropillar cavity.
- On-chip quantum frequency conversion using silicon nanophotonics.
- Characterization of the intensity autocorrelation function (g^(2)(τ)) before and after frequency conversion.
- Evaluation of the conversion interface's effectiveness across a wide range of input wavelengths (840 nm to 980 nm).
Main Results:
- First demonstration of quantum frequency conversion for a quantum dot single-photon source on a silicon nanophotonic chip.
- Achieved an on-chip conversion efficiency of approximately 12%, limited by the quantum dot photon linewidth.
- Frequency-converted light exhibited antibunching with g^(2)(0) = 0.290 ± 0.030, confirming single-photon nature.
- Demonstrated suitability across a broad input wavelength range (840-980 nm) and tunable wavelength shifts.
Conclusions:
- Chip-integrated quantum frequency conversion is a viable method to standardize wavelengths from quantum dot single-photon sources.
- This technology addresses a key challenge in scaling quantum information processing by enabling identical photon sources.
- The demonstrated platform provides a versatile resource for quantum dot-based quantum technologies.
