Highly stable chip-based variable optical attenuation for continuous-variable quantum key distribution

Xuesong Xu; Yiming Bian; Yang Li; Tao Zhang; Yan Pan; Wei Huang; Song Yu; Lei Zhang; Yichen Zhang; Bingjie Xu

doi:10.1117/12.3043093

5 December 2024 Highly stable chip-based variable optical attenuation for continuous-variable quantum key distribution

Xuesong Xu, Yiming Bian, Yang Li, Tao Zhang, Yan Pan, Wei Huang, Song Yu, Lei Zhang, Yichen Zhang, Bingjie Xu

Proceedings Volume 13418, Fifteenth International Conference on Information Optics and Photonics (CIOP 2024); 1341809 (2024) https://doi.org/10.1117/12.3043093
Event: 15th International Conference on Information Optics and Photonics (CIOP2024), 2024, Xi’an, China

Abstract

Conventional continuous-variable quantum key distribution systems typically rely on discrete optical components, which have limited integration, are bulky and expensive. To overcome these drawbacks, photonic integrated circuit technology is a viable alternative that promises to increase the system integration. However, variable optical attenuators compatible with established photonic integration processes have stability difficulties that limit the performance of the system. This work provides a chip-based variable optical attenuator based on Mach-Zehnder interferometer structure. By using an unbalanced interferometer arm, the sensitivity of the optical attenuation coefficient to environmental fluctuations can be reduced, ensuring the high-precision control required for continuous-variable quantum key distribution systems. Our scheme will facilitate the implementation of a reliable and highly stable chip-based continuous-variable quantum key distribution system.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Xuesong Xu, Yiming Bian, Yang Li, Tao Zhang, Yan Pan, Wei Huang, Song Yu, Lei Zhang, Yichen Zhang, and Bingjie Xu "Highly stable chip-based variable optical attenuation for continuous-variable quantum key distribution", Proc. SPIE 13418, Fifteenth International Conference on Information Optics and Photonics (CIOP 2024), 1341809 (5 December 2024); https://doi.org/10.1117/12.3043093

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KEYWORDS

Signal attenuation

Continuous variable quantum key distribution

Mach Zehnder interferometers

Quantum systems

Telecommunications

Quantum interferometry

Phase shifts

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