Temperature characterizations of silica asymmetric Mach-Zehnder interferometer chip for quantum key distribution

Wu Dan; Li Xiao; Wang Liang-Liang; Zhang Jia-Shun; Chen Wei; Wang Yue; Wang Hong-Jie; Li Jian-Guang; Yin Xiao-Jie; Wu Yuan-Da; An Jun-Ming; Song Ze-Guo

doi:10.1088/1674-1056/ac9224

Volume 32 Issue 1

May. 2023

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JOURNAL OF MECHANICAL ENGINEERING > 2023 > 32(1): 010305.

Wu Dan, Li Xiao, Wang Liang-Liang, Zhang Jia-Shun, Chen Wei, Wang Yue, Wang Hong-Jie, Li Jian-Guang, Yin Xiao-Jie, Wu Yuan-Da, An Jun-Ming, Song Ze-Guo. Temperature characterizations of silica asymmetric Mach-Zehnder interferometer chip for quantum key distribution[J]. JOURNAL OF MECHANICAL ENGINEERING, 2023, 32(1): 010305. doi: 10.1088/1674-1056/ac9224

Citation:

Wu Dan, Li Xiao, Wang Liang-Liang, Zhang Jia-Shun, Chen Wei, Wang Yue, Wang Hong-Jie, Li Jian-Guang, Yin Xiao-Jie, Wu Yuan-Da, An Jun-Ming, Song Ze-Guo. Temperature characterizations of silica asymmetric Mach-Zehnder interferometer chip for quantum key distribution[J]. JOURNAL OF MECHANICAL ENGINEERING, 2023, 32(1): 010305. doi: 10.1088/1674-1056/ac9224

Citation:

Wu Dan, Li Xiao, Wang Liang-Liang, Zhang Jia-Shun, Chen Wei, Wang Yue, Wang Hong-Jie, Li Jian-Guang, Yin Xiao-Jie, Wu Yuan-Da, An Jun-Ming, Song Ze-Guo. Temperature characterizations of silica asymmetric Mach-Zehnder interferometer chip for quantum key distribution[J]. JOURNAL OF MECHANICAL ENGINEERING, 2023, 32(1): 010305. doi: 10.1088/1674-1056/ac9224

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Temperature characterizations of silica asymmetric Mach-Zehnder interferometer chip for quantum key distribution

doi: 10.1088/1674-1056/ac9224

1.
State Key Laboratory on Integrated Optoelectronics, Institute of Semiconductors, Chinese Academy of Sciences,Beijing 100083,China
2.
Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences,Beijing 100049,China
3.
College of Materials Science and Opto-Electronic Technology, University of Chinese Academy of Sciences,Beijing 100049,China
4.
Laboratory of Quantum Information, CAS, University of Science and Technology of China,Hefei 230026,China
5.
Wuxi Institute of Interconnect Technology, Co., Ltd.Wuxi 214000,China

Received Date: 24 Jun 2022
Available Online: 31 May 2023
Issue Publish Date: 01 Jan 2023

Abstract

Abstract

Quantum key distribution (QKD) system based on passive silica planar lightwave circuit (PLC) asymmetric Mach–Zehnder interferometers (AMZI) is characterized with thermal stability, low loss and sufficient integration scalability. However, waveguide stresses, both intrinsic and temperature-induced stresses, have significant impacts on the stable operation of the system. We have designed silica AMZI chips of 400 ps delay, with bend waveguides length equalized for both long and short arms to balance the stresses thereof. The temperature characteristics of the silica PLC AMZI chip are studied. The interference visibility at the single photon level is kept higher than 95% over a wide temperature range of 12 °C. The delay time change is 0.321 ps within a temperature change of 40 °C. The spectral shift is 0.0011~nm/0.1 °C. Temperature-induced delay time and peak wavelength variations do not affect the interference visibility. The experiment results demonstrate the advantage of being tolerant to chip temperature fluctuations.
- quantum key distribution,
- planar lightwave circuit,
- temperature characterization,
- interference visibility

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Temperature characterizations of silica asymmetric Mach-Zehnder interferometer chip for quantum key distribution

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