Low-loss,dual-polarization asymmetric Mach-Zehnder interferometer chips for quantum key distribution  

作　　者：Meizhen REN Lai ZHOU Zhiliang YUAN 

机构地区：[1]Beijing Academy of Quantum Information Sciences,Beijing 100193,China

出　　处：《Science China(Information Sciences)》2023年第8期41-47,共7页中国科学（信息科学）（英文版）

摘　　要：We have developed the first low-loss,dual-polarization,asymmetric Mach-Zehnder interferometer(AMZI)chip for phase-coding quantum key distribution(QKD)using silica planar lightwave circuit technology.The transmitter and receiver modules have a polarization extinction ratio greater than 20 and15 d B,respectively.Using a birefringent Mach-Zehnder interferometer,a polarization beam splitter is integrated into the receiver chip,while the polarization rotation function is obtained via a half-wave plate thin film.The receiver chip is entirely passive and has an excellent fiber C fiber loss of 1.90 d B,while the transmitter’s AMZI contains thermo-optical electrodes for adjusting the output pulses’relative phase and intensity ratio.The chips are evaluated to have an interference visibility of greater than 98%across a broad temperature range,demonstrating their suitability for quantum key distribution applications.

关 键 词：quantum key distribution DUAL-POLARIZATION asymmetric Mach-Zehnder interferometer polar-ization beam splitter silica-based planar lightwave circuit technology 

分 类 号：O413[理学—理论物理] TN918.4[理学—物理]