(英)基于二氧化硅平面光波导技术的强度均衡的光脉冲对的产生
投稿时间:2019-03-19  修订日期:2019-05-23  点此下载全文
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作者单位E-mail
任梅珍 中国科学院半导体研究所 renmeizhen@semi.ac.cn 
李骁 中国科学院半导体研究所  
张家顺 中国科学院半导体研究所  
王亮亮 中国科学院半导体研究所  
王玥 中国科学院半导体研究所  
尹小杰 中国科学院半导体研究所  
吴远大 中国科学院半导体研究所  
安俊明 中国科学院半导体研究所  
基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目)
中文摘要:通过光脉冲对编码量子比特是实现量子密钥分发协议的通用方法,尤其是BB84协议。其中使脉冲对的功率均衡是很重要的一步,因为均衡的功率可以提高量子干涉可见度,进而降低量子误码率。为了使脉冲对均衡,我们提出了一种基于平面光波导工艺的带有可调定向耦合器的非对称MZI结构。模拟结果显示,当定向耦合器的两个耦合臂的折射率独立改变时,定向耦合器的调制效果较好;当调制电极与耦合区的波导间距为0时,两个耦合臂的温度差达到最大。测试得到,AMZI的插入损耗为2.05dB,延迟时间为151.4ps,脉冲对的功率比近似为1。该器件有助于提高集成QKD器件的性能。
中文关键词:非对称MZI,热场模拟,量子密钥分发
 
Generation of an intensity-balanced optical pulse couple based on silica planar lightwave circuit*
Abstract:Encoding qubits in optical time-bin pulses is universally employed in the realization of quantum key distribution (QKD) protocols, such as BB84 protocol. It is vital to make equivalent the intensities of the pulse couple, since balancing intensities contributes to high quantum interference visibility, hence reducing the quantum bit error rate(QBER). To make the pulse couple balanced, here we propose an asymmetric Mach–Zehnder interferometer (AMZI) with a tunable directional coupler (DC) of a silica-based planar lightwave circuit (PLC) technology. The simulation results showed the DC tuning effect is better when the refractive index of both coupling arms changes independently. When the distance between the electrode and the waveguide core in the coupling zone is 0, the temperature difference between the coupling arms reaches the maximum. The test results of AMZI showed the insertion loss is 2.05 dB, the delay time is 151.4 ps. The power ratio of the pulse couple is highly close to one. Our device presents a practical solution to improve the performance of future integrated QKD device.
keywords:asymmetric  Mach-Zehnder  interferometer, thermal  field simulation, quantum  key distribution
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