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Updated: Jul 25, 2025
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A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
Published on: September 5, 2019
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Low-loss polarization control in fiber systems for quantum computation
Optics Express
|June 29, 2023
Summary
We developed a low-loss method to improve interference visibility in optical quantum systems. This technique maintains high visibility for fiber-based quantum computing, making it more practical.
Area of Science:
- Quantum information science
- Optical physics
- Fiber optics
Background:
- Low loss interference of quantum light is crucial for optical quantum information processing.
- Degradation of interference visibility due to polarization extinction ratio is a key challenge in fiber-based interferometers.
Purpose of the Study:
- To propose and demonstrate a low-loss method for optimizing interference visibility in optical fiber systems.
- To enhance the practicality of fiber systems for fault-tolerant optical quantum computers.
Main Methods:
- Controlling polarization to a specific point (crosspoint) on the Poincaré sphere.
- Utilizing fiber stretchers as polarization controllers on both interferometer paths.
- Minimizing optical loss during polarization control.
Main Results:
- Visibility was maintained above 99.9% for three hours in experimental demonstrations.
- The proposed method achieved this high visibility with minimal optical loss (0.02 dB or 0.5%).
Conclusions:
- The developed method offers a low-loss solution for maximizing interference visibility.
- This technique significantly advances the feasibility of fiber-based systems for practical optical quantum computing.
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