• Chinese Optics Letters
  • Vol. 20, Issue 9, 092701 (2022)
Jipeng Wang, Zhenhua Li, Zhongqi Sun, Tianqi Dou, Wenxiu Qu, Fen Zhou, Yanxin Han, Yuqing Huang, and Haiqiang Ma*
Author Affiliations
  • School of Science and State Key Laboratory of Information Photonics and Optical Communications, Beijing University of Posts and Telecommunications, Beijing 100876, China
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    DOI: 10.3788/COL202220.092701 Cite this Article
    Jipeng Wang, Zhenhua Li, Zhongqi Sun, Tianqi Dou, Wenxiu Qu, Fen Zhou, Yanxin Han, Yuqing Huang, Haiqiang Ma. Loss-tolerant measurement device independent quantum key distribution with reference frame misalignment[J]. Chinese Optics Letters, 2022, 20(9): 092701 Copy Citation Text show less

    Abstract

    Reference frame independent and measurement device independent quantum key distribution (RFI-MDI-QKD) has the advantages of being immune to detector side loopholes and misalignment of the reference frame. However, several former related research works are based on the unrealistic assumption of perfect source preparation. In this paper, we merge a loss-tolerant method into RFI-MDI-QKD to consider source flaws into key rate estimation and compare it with quantum coin method. Based on a reliable experimental scheme, the joint influence of both source flaws and reference frame misalignment is discussed with consideration of the finite-key effect. The results show that the loss-tolerant RFI-MDI-QKD protocol can reach longer key rate performance while considering the existence of source flaws in a real-world implementation.

    1. Introduction

    The first quantum key distribution (QKD) protocol, BB84 protocol[1], is proven secure in defending the formidable decryption ability in the approaching era of quantum computing[24]. In this decade, it is significant to narrow down the gap between ideal unconditional security and imperfect realistic devices. From the viewpoint of Eve, there are two main types of vulnerabilities to security, which are the light source at the transmitter and the detector at receiver[57]. As a countermeasure, the decoy state protocol can circumvent the photon number splitting attack, and a weak coherent source can be applied in QKD applications[810]. In addition, measurement device independent (MDI) protocol[11] can remove all the side channels’ loopholes aiming at the measurement devices. Besides, MDI-QKD realizes a star-type quantum network and improves the ability of long distance transmission[1214]. With the important practical prospect, it has been experimentally demonstrated to break through the 400 km fiber transmission[15] and applied in the chip-based platform as well as the free-space channel[1619].

    Copy Citation Text
    Jipeng Wang, Zhenhua Li, Zhongqi Sun, Tianqi Dou, Wenxiu Qu, Fen Zhou, Yanxin Han, Yuqing Huang, Haiqiang Ma. Loss-tolerant measurement device independent quantum key distribution with reference frame misalignment[J]. Chinese Optics Letters, 2022, 20(9): 092701
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