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ECTI-Con 2018 (Keynote Speech) - July 2018

Title: Differential-Phase-Shift Quantum Key Distribution

     Unlike classical cryptography, whose security relies on unproven mathematical assumptions, quantum key distribution (QKD) can information-theoretically distribute secret key bits between distant parties. According to quantum mechanics, any eavesdropping on a quantum channel will be disclosed.

Differential-phase-shift (DPS) is an important QKD protocol, since it can be implemented with very high repetition rate. More importantly, round-robin-differential-phase-shift (RRDPS) protocol, which is a variant of DPS protocol, has several notable advantages over other protocols. The main merit is that signal disturbance monitoring can be removed during the RRDPS protocol. The removal of monitoring is quite meaningful in practice. 

We obtain an improved theoretical bound on the information leakage. Consequently, we verify our theory through a proof-of-principle experiment, which can run at a distance of 30 km without signal disturbance monitoring and decoy states. In addition, a demonstration at 140 km is also realized with monitoring signal disturbance and decoy states.

Brief Biography
     Zhen-Qiang Yin has received his Dr.’s degree from the University of Science and Technology of China (USTC) in 2010. He is currently an associated professor of the key lab of quantum information, USTC, where he is involved in the research on quantum key distribution (QKD) and quantum information. Dr. Yin has made much efforts to promote the security and applications of QKD. He has published more than 90 papers in this field, including the papers in Nature Photonics, Nature Communications, Physical Review Letters, Physical Review A, Optics Letters, IEEE Journal of Lightwave Technology, et al.

#ExperiencesSharing (Q-Thai.Org): 13 Q & A - Quantum stories (from China) to Thailand

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