Experimental Shot Noise Measurement Using the Imperfect Detection—A Special Case for Pulsed Laser

IF 2.2 3区工程技术 Q3 ENGINEERING, ELECTRICAL & ELECTRONIC

IEEE Journal of Quantum Electronics Pub Date : 2023-08-24 DOI:10.1109/JQE.2023.3308263

Anju Rani;Jayanth Ramakrishnan;Tanya Sharma;Pooja Chandravanshi;Ayan Biswas;Ravindra P. Singh

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Abstract

Measuring the quantum fluctuations of a laser source is the first task in performing continuous variable quantum key distribution protocols. The quantum fluctuations of the source are measured using balanced homodyne detection. In this paper, we have measured the shot noise of a pulsed laser using imperfect homodyne detection. The imperfections accounted for in the detection process are a delay between the homodyne output arms and also due to the selection of the pulse integration window larger as well as smaller than the photo-current pulse width during the analysis. We have analyzed the imperfect detection results for two different experimental layouts, and a comparative study has been performed. From our analysis, it is evident that these imperfections play a significant role in balanced homodyne detection and must be optimized properly. Our results indicate that balanced homodyne detection can be performed using limited resources, which paves the way for easy experimental realization of optical homodyne tomography and continuous variable quantum key distribution in a laboratory setting.

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基于不完全检测的实验射击噪声测量——以脉冲激光为例

测量激光源的量子涨落是实现连续可变量子密钥分配协议的首要任务。源的量子涨落是用平衡同差检测测量的。本文采用不完全同差法测量了脉冲激光的射散噪声。检测过程中的缺陷是差量输出臂之间的延迟，也是由于在分析过程中选择的脉冲积分窗口大于或小于光电流脉宽。我们分析了两种不同实验布局下的不完善检测结果，并进行了对比研究。从我们的分析中可以明显看出，这些缺陷在平衡差检测中起着重要的作用，必须适当地优化。我们的研究结果表明，平衡同差检测可以在有限的资源下进行，这为在实验室环境下轻松实现光学同差断层扫描和连续可变量子密钥分配铺平了道路。

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

IEEE Journal of Quantum Electronics 工程技术-工程：电子与电气

CiteScore

4.70

自引率

4.00%

发文量

审稿时长

3.0 months

期刊介绍： The IEEE Journal of Quantum Electronics is dedicated to the publication of manuscripts reporting novel experimental or theoretical results in the broad field of the science and technology of quantum electronics. The Journal comprises original contributions, both regular papers and letters, describing significant advances in the understanding of quantum electronics phenomena or the demonstration of new devices, systems, or applications. Manuscripts reporting new developments in systems and applications must emphasize quantum electronics principles or devices. The scope of JQE encompasses the generation, propagation, detection, and application of coherent electromagnetic radiation having wavelengths below one millimeter (i.e., in the submillimeter, infrared, visible, ultraviolet, etc., regions). Whether the focus of a manuscript is a quantum-electronic device or phenomenon, the critical factor in the editorial review of a manuscript is the potential impact of the results presented on continuing research in the field or on advancing the technological base of quantum electronics.

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