[10p-S422-1~12] 3.10 Optical quantum physics and technologies

▼ [10p-S422-10] BB84 experiment using one polarization-insensitive measurement setup with a countermeasure against blinding and controlling attack

〇(DC)Muataz Alhussein¹, Kyo Inoue¹, Toshimori Honjo² (1.Osaka University, 2.NTTBRL)

Keywords:Quantum Key Distribution, Polarization-insensitive measurement setup for BB84, Countermeasure against side-channel attacks

In phase-encoding BB84-based QKD protocols, Bob selects the measurement basis by {0, π/2} phase modulation (PM) onto one arm of a delay Mach-Zehnder interferometer (MZI) [1]. Alternatively, he can use a combination of a beam splitter and two MZIs with path phase differences of 0 and π/2, respectively, for stable operation. The former scheme requires phase and polarization state controls, and the latter one makes the receiver massive and expensive. In view of these issues in practical implementation of BB84-based QKD systems, this paper demonstrates a BB84 experiment that employs a polarization-insensitive PM circuit followed by one waveguide MZI. A countermeasure against detector blinding and control attacks is also implemented. Our scheme enables simple and cost-effective QKD system implementation.