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Cryo-compatible opto-mechanical low-voltage phase-modulator integrated with superconducting single-photon detectors
Optics Express
|October 15, 2022
Summary
This study introduces a cryo-compatible phase shifter for quantum photonic circuits. It enables low-voltage operation and joint functionality with superconducting nanowire single-photon detectors at cryogenic temperatures.
Area of Science:
- Quantum optics and information processing
- Integrated photonics
- Cryogenic systems
Background:
- Photonic integrated circuits (PICs) are crucial for quantum technologies.
- Silicon Nitride (Si3N4) PICs offer low loss and compatibility with single-photon detectors.
- Integrating active components like phase shifters at cryogenic temperatures for superconducting nanowire single-photon detectors (SNSPDs) is challenging.
Purpose of the Study:
- To demonstrate a phase shifter compatible with cryogenic operation.
- To enable reconfigurable quantum photonic circuits at low temperatures.
- To integrate active phase control with SNSPDs.
Main Methods:
- Development of a low-voltage opto-mechanical modulator for phase shifting.
- Integration of the phase shifter with Silicon Nitride PICs.
- Joint operation and testing with SNSPDs at 1.3 K.
Main Results:
- Achieved a low half-wave voltage of 4.6 V for the phase shifter.
- Demonstrated 88% on-chip detection efficiency (OCDE) with SNSPDs.
- Measured a low timing jitter of 12.2 ps.
- Showcased joint operation at 1.3 K.
Conclusions:
- The developed opto-mechanical phase shifter is cryo-compatible.
- This technology facilitates low-dissipation, reconfigurable quantum photonic circuits operating at cryogenic temperatures.
- Enables advanced quantum information processing and communication systems.
