Arbitrary bias control of LiNbO3 based Mach-Zehnder intensity modulators for QKD system

IF 5.8 2区物理与天体物理 Q1 OPTICS

EPJ Quantum Technology Pub Date : 2023-09-07 DOI:10.1140/epjqt/s40507-023-00189-8

Jun Teng, Shuang Wang, Zhen-Qiang Yin, Wei Chen, Guan-Jie Fan-Yuan, Guang-Can Guo, Zheng-Fu Han

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引用次数: 0

Abstract

Quantum key distribution (QKD) can help distant agents to share unconditional secret keys, and the achievable secret key rate can be enhanced with the help of decoy-state protocol. To implement QKD experimentally, the agents are supposed to accurately transmit a number of different intensity pulses with the LiNbO₃ based Mach-Zehnder (LNMZ) intensity modulator. However, the bias drift of LNMZ intensity modulator may affect the performance of a QKD system. In this letter, we reveal a simple RC circuit model to demonstrate the bias drift in the LNMZ intensity modulator. And based on the model, we propose a multi-step bias stable scheme to control the bias working point. Experimental result shows that our scheme can eliminate the bias drift of at arbitrary working point within a long time range. Besides, there is no need of any feedback mechanisms in the scheme. This means our scheme will not lead to any increasement in system complexity, making it more suitable for a QKD system.

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QKD系统中基于LiNbO3的马赫-曾德尔强度调制器的任意偏置控制

量子密钥分发(QKD)可以帮助远程代理共享无条件密钥，并且借助诱饵状态协议可以提高可实现的密钥速率。为了在实验上实现QKD, agent应该使用基于LiNbO3的Mach-Zehnder (LNMZ)强度调制器准确地传输许多不同强度的脉冲。然而，LNMZ强度调制器的偏置漂移会影响QKD系统的性能。在这封信中，我们揭示了一个简单的RC电路模型来演示LNMZ强度调制器中的偏置漂移。在此基础上，提出了多步偏置稳定方案来控制偏置工作点。实验结果表明，该方案可以在较长的时间范围内消除任意工作点的偏置漂移。此外，该方案不需要任何反馈机制。这意味着我们的方案不会导致系统复杂性的任何增加，使其更适合于QKD系统。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

EPJ Quantum Technology Physics and Astronomy-Atomic and Molecular Physics, and Optics

CiteScore

7.70

自引率

7.50%

发文量

审稿时长

71 days

期刊介绍： Driven by advances in technology and experimental capability, the last decade has seen the emergence of quantum technology: a new praxis for controlling the quantum world. It is now possible to engineer complex, multi-component systems that merge the once distinct fields of quantum optics and condensed matter physics. EPJ Quantum Technology covers theoretical and experimental advances in subjects including but not limited to the following: Quantum measurement, metrology and lithography Quantum complex systems, networks and cellular automata Quantum electromechanical systems Quantum optomechanical systems Quantum machines, engineering and nanorobotics Quantum control theory Quantum information, communication and computation Quantum thermodynamics Quantum metamaterials The effect of Casimir forces on micro- and nano-electromechanical systems Quantum biology Quantum sensing Hybrid quantum systems Quantum simulations.