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Realization of ultralow power phase locking by optimizing Q factor of resonant photodetector |
Jin-Rong Wang(王锦荣)1, Hong-Yu Zhang(张宏宇)1,2, Zi-Lin Zhao(赵子琳)1,2, and Yao-Hui Zheng(郑耀辉)1,3,† |
1 State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Opto-Electronics, Shanxi University, Taiyuan 030006, China; 2 Department of Electronics and Information Technology, Shanxi University, Taiyuan 030006, China; 3 Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan 030006, China |
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Abstract We design and construct a resonant photodetector (RPD) with a Q factor of 320.83 at the resonant frequency of 38.5 MHz on the basis of a theoretical analysis. Compared with the existing RPD under the same conditions, the signal-to-noise-ratio of the error signal is increased by 15 dB and the minimum operation power is reduced from -55 dBm to -70 dBm. By comparing the standard deviations of the stability curves, we confirm that the RPD has a dramatic improvement on ultralow power extraction. In virtue of the RPD, we have completed the demonstration of channel multiplexing quantum communication.
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Received: 31 July 2020
Revised: 21 August 2020
Accepted manuscript online: 28 September 2020
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PACS:
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42.50.-p
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(Quantum optics)
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85.60.Gz
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(Photodetectors (including infrared and CCD detectors))
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Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 62027821, 11654002, 11874250, and 11804207), the National Key R&D Program of China (Grant No. 2016YFA0301401), the Key R&D Program of Shanxi, China (Grant No. 201903D111001), the Program for Sanjin Scholar of Shanxi Province, the Program for Outstanding Innovative Teams of Higher Learning Institutions of Shanxi, China, and the Fund for Shanxi "1331 Project" Key Subjects Construction, China. |
Corresponding Authors:
†Corresponding author. E-mail: yhzheng@sxu.edu.cn
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Cite this article:
Jin-Rong Wang(王锦荣), Hong-Yu Zhang(张宏宇), Zi-Lin Zhao(赵子琳), and Yao-Hui Zheng(郑耀辉) Realization of ultralow power phase locking by optimizing Q factor of resonant photodetector 2020 Chin. Phys. B 29 124207
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