Freiburg 2024 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 13: Quantum Technologies
Q 13.5: Talk
Monday, March 11, 2024, 18:00–18:15, HS 3219
Performance Comparison of Polarization Compensation Devices on a Deployed Inter City Fiber Link for Quantum Communication Applications — •Saili Naik1,2, Gregor Sauer1,2, Pritom Paul1,2, and Fabian Steinlechner1,2 — 1Fraunhofer Institute for Applied Optics and Precision Engineering, Albert-Einstein-Str. 07, 07745 Jena, Germany — 2Friedrich Schiller University, Institute of Applied Physics, Abbe Center of Photonics, Albert-Einstein-Str. 15, 07745 Jena, Germany
Within a quantum network, different properties of photons can be used to transmit quantum information. One such technique involves utilizing the polarization state of photons, due to ease of manipulation and detection. However, when such qubits are transmitted over long optical fiber links, their polarization state undergoes unpredictable changes caused by environmental factors. So, accurate measurement of quantum correlations in the polarization basis necessitates fast and precise compensation of these polarization drifts.
Several motorized polarization manipulation devices are available in the market, distinguished by distinct operating principles. In this work, we examine a range of performance parameters associated with these devices, including the response linearity, hysteresis, and operation speed. We also run compensation algorithms on these devices to assess their capacity for polarization compensation in low and high drift speed scenarios. This study aims to enhance our understanding of long-term behavior of polarization-based QKD systems in real-world application environments.
Keywords: Polarization Compensation; Quantum Communication; Fiber Link; Polarization Drifts; Quantum Key Distribution