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Article

Experimental Demonstration of an Efficient Mach–Zehnder Modulator Bias Control for Quantum Key Distribution Systems

1
Center for Quantum Information, Korea Institute of Science and Technology (KIST), Seoul 02792, Korea
2
Department of Electrical and Computer Engineering, Ajou University, Suwon 16499, Korea
3
Division of Nano and Information Technology, KIST School, Korea University of Science and Technology, Seoul 02792, Korea
*
Author to whom correspondence should be addressed.
Academic Editors: Durdu Guney and Lucas Lamata
Electronics 2022, 11(14), 2207; https://doi.org/10.3390/electronics11142207
Received: 31 May 2022 / Revised: 6 July 2022 / Accepted: 13 July 2022 / Published: 14 July 2022
(This article belongs to the Topic Quantum Information and Quantum Computing)
A Mach–Zehnder modulator (MZM) is necessary for implementing a decoy-state protocol in a practical quantum key distribution (QKD) system. However, an MZM bias control method optimized for QKD systems has been missing to date. In this study, we propose an MZM bias control method using N (≥2) diagnostic pulses. The proposed method can be efficiently applied to a QKD system without any additional hardware such as light sources or detectors. Furthermore, it does not reduce the key rate significantly because it uses time slots allocated to existing decoy pulses. We conducted an experimental demonstration of the proposed method in a field-deployed 1 × 3 QKD network and a laboratory test. It is shown that our method can maintain the MZM extinction ratio stably over 20 dB (bit error rate ≤1%), even in an actual network environment for a significant period. Consequently, we achieved successful QKD performances. View Full-Text
Keywords: quantum key distribution; Mach–Zehnder modulator; bias control; decoy-state protocol quantum key distribution; Mach–Zehnder modulator; bias control; decoy-state protocol
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MDPI and ACS Style

Park, C.-H.; Woo, M.-K.; Park, B.-K.; Jeon, S.-W.; Jung, H.; Kim, S.; Han, S.-W. Experimental Demonstration of an Efficient Mach–Zehnder Modulator Bias Control for Quantum Key Distribution Systems. Electronics 2022, 11, 2207. https://doi.org/10.3390/electronics11142207

AMA Style

Park C-H, Woo M-K, Park B-K, Jeon S-W, Jung H, Kim S, Han S-W. Experimental Demonstration of an Efficient Mach–Zehnder Modulator Bias Control for Quantum Key Distribution Systems. Electronics. 2022; 11(14):2207. https://doi.org/10.3390/electronics11142207

Chicago/Turabian Style

Park, Chang-Hoon, Min-Ki Woo, Byung-Kwon Park, Seung-Woo Jeon, Hojoong Jung, Sangin Kim, and Sang-Wook Han. 2022. "Experimental Demonstration of an Efficient Mach–Zehnder Modulator Bias Control for Quantum Key Distribution Systems" Electronics 11, no. 14: 2207. https://doi.org/10.3390/electronics11142207

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