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Silicon-based decoder for polarization-encoding quantum key distribution

Chip 2023年第1期2卷 45-50页

作者： Yongqiang Du Xun Zhu Xin Hua Zhengeng Zhao Xiao Hu Yi Qian Xi Xiao Kejin Wei Guangxi Key Laboratory for Relativistic Astrophysics School of Physical Sci-ence and TechnologyGuangxi UniversityNanning 530004China National In-formation Optoelectronics Innovation Center(NOEIC) Wuhan 430074China State Key Laboratory of Optical Communication Technologies and Networks China Information and Communication Technologies Group Corporation(CICT)Wuhan 430074China

Silicon-based polarization-encoding quantum key distribution(QKD)has been extensively studied due to its advantageous characteris-tics of its low cost and ***,given the difficulty of fabricating polarized independent components on the chip,previ-ous studies have only adopted off-chip devices to demodulate the quantum states or perform polarization *** the cur-rent work,a fully chip-based decoder for polarization-encoding QKD was *** chip realized a polarization state analyzer and compensated for the BB84 protocol without the requirement of additional hardware,which was based on a polarization-to-path conversion method utilizing a polarization *** chip was fabricated adopting a standard silicon photonics foundry,which was of a compact design and suitable for mass *** the experimental stability test,an average quantum bit error rate of 0.59%was achieved through continuous operation for 10 h with-out any polarization ***,the chip enabled the automatic compensation of the fiber polarization drift when utiliz-ing the developed feedback algorithm,which was emulated by a ran-dom fiber polarization ***,a finite-key secret rate of 240 bps over a fiber spool of 100 km was achieved in the case of the QKD *** study marks an important step to-ward the integrated,practical,and large-scale deployment of QKD systems.

关键词： Quantum key distribution Silicon photonics Chip polarization-encoding polarization compensation

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Experimental validation of dynamic polarization compensation in ground-satellite quantum key distribution

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Science China(Physics,Mechanics & Astronomy) 2014年第7期57卷 1233-1237页

作者： WANG ChaoZe GUO Hui REN JiGang CAO Yuan PENG ChengZhi LIU WeiYue College of Information Science and Engineering Ningbo University Hefei National Laboratory for Physical Science at the Microscale Modern Physics Department University of Science and Technology of China

Ground-satellite quantum key distribution(QKD)is a feasible way to implement global-scale quantum *** we propose an approach to dynamically compensate the polarization of the photons when passing through the optical telescope used in ground-satellite *** results experimentally demonstrate that the fidelity of any polarization state after dynamic compensation can be achieved by more than 99.5%,which fulfills the requirements of ground-satellite QKD.

关键词： satellite-ground quantum key distribution polarization-encoding polarization maintaining optical system

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Designs of All-Optical Higher-Order Signed-Digit Adders Using polarization-Encoded Based Terahertz-Optical-Asymmetric-Demultiplexer (TOAD)

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Optics and Photonics Journal 2014年第6期4卷 113-128页

作者： Ali Hajjiah Abdullah Alqallaf Abdallah Cherri Department of Electrical Engineering College of Engineering & Petroleum Kuwait University Safat Kuwait

Various designed circuits for multiple-valued all-optical arithmetic are demonstrated. The terahertz-optical-asymmetric-demultiplexer (TOAD) switch is used as the basic structure unit in the proposed circuits due to its compact size, thermal stability, and low power operation. The designs of trinary and quaternary signed-digit numbers based adders are presented using different polarized states of light. These proposed polarization-encoded based adders use much less switches and their speeds are higher than the intensity-encoded counterparts. Further, it will be shown that one of the proposed trinary signed-digit adders is twice as fast as a recently reported modified signed-digit adder.

关键词： Multiple-Valued Signed-Digit All-Optical Gates polarization-encoding Terahertz-Optical-Asymmetric-Demultiplexer (TOAD)

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