Realization of ultralow power phase locking by optimizing Q factor of resonant photodetector

• 来源期刊: 中国物理B（英文版）
• 年，卷（期）: 2020,（12）
• 所属期刊栏目: RAPID COMMUNICATION
• 页码范围: 98-103
• 页数: 6页
• 语种: 英文
• DOI: 10.1088/1674-1056/abbbfb

摘要

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 improve-ment on ultralow power extraction.In virtue of the RPD,we have completed the demonstration of channel multiplexing quantum communication.