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Long-term stability of squeezed light in a fiber-based system using automated alignment
Tomohiro Nakamura1, Takefumi Nomura1, Mamoru Endo1,2
1Department of Applied Physics, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan.
The Review of Scientific Instruments
|September 30, 2024
Summary
Researchers developed a stable fiber-based system for optical quantum computing, successfully measuring squeezed light for 24 hours. This breakthrough enables long-term operation of complex quantum systems, paving the way for cloud quantum computation services.
Area of Science:
- Quantum Optics
- Fiber Optics Engineering
Background:
- Optical quantum computing requires stable systems for extended operation.
- Fiber-based systems offer advantages over free-space optics but face unique instabilities like phase drifts and polarization fluctuations.
- Existing fiber systems lack long-term stability for practical applications such as cloud services.
Purpose of the Study:
- To demonstrate the feasibility of a stable fiber-based system for continuous measurement of squeezed light.
- To develop and implement stabilization mechanics and automated alignment for fiber-based optical quantum systems.
- To enable long-term, automated operation of complex optical setups for quantum computation.
Main Methods:
- Development of novel stabilization mechanics to mitigate fiber-specific instabilities (temperature drifts, external disturbances).
- Implementation of an integrated controller for automated alignment of the fiber system.
- Continuous measurement of squeezed light at 1545.3 nm over a 24-hour period with automated recalibration every 30 minutes.
Main Results:
- Successful 24-hour measurement of squeezed light using a fiber-based system.
- Achieved average squeezing levels of -4.42 dB.
- Recorded extremely low standard deviation of 0.08 dB over the 24-hour measurement period, demonstrating high stability.
Conclusions:
- The developed stabilization and automated alignment technologies are effective in overcoming fiber-based instabilities.
- This work validates the potential of fiber-based systems for complex, long-term optical setups.
- The findings are promising for the realization of cloud services for quantum computation.
