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High-Purity Generation and Switching of Twisted Single Photons
Haoqi Zhao1,2, Yichen Ma3,4, Zihe Gao2
1Department of Electrical and Systems Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA.
Physical Review Letters
|November 17, 2023
Summary
Researchers developed a tunable twisted single photon source using 2D semiconductors and microring resonators. This breakthrough enhances quantum information processing with high purity and orbital angular momentum control.
Area of Science:
- Quantum technology
- Optoelectronics
- Materials science
Background:
- Quantum technologies offer enhanced connectivity, higher bit rates, and ultrasecure information transfer.
- Twisted single photons, utilizing orbital angular momentum (OAM), are crucial for high-dimensional quantum information encoding and transmission.
Purpose of the Study:
- To demonstrate an integrated tunable twisted single photon source.
- To precisely define and switch between highly pure spin-orbital angular momentum (OAM) states.
- To explore quantum-chiral control for on-chip quantum information processing.
Main Methods:
- Hybrid integration of two-dimensional semiconductor WSe2 with a spin-orbit-coupled microring resonator.
- Development of a tunable single photon source.
- Characterization of single photon purity, quantum yield, and OAM mode purity.
Main Results:
- Achieved single photon purity of g(2)(0)∼0.13.
- Demonstrated a cavity-enhanced quantum yield of 76%.
- Obtained high orbital angular momentum (OAM) mode purity up to 96.9%.
Conclusions:
- The integrated tunable twisted single photon source enables precise control over spin-OAM states.
- Quantum-chiral control offers potential for advanced quantum functionalities like on-chip single photon routing.
- This work advances high-dimensional quantum information processing and communication.
