Proof-of-principle experimental demonstration of quantum secure imaging based on quantum key distribution

Zhao Yi-Bo^{1, 2}, Zhang Wan-Li^{1, 2}, Wang Dong^{1, 2}, Song Xiao-Tian^{1, 2}, Zhou Liang-Jiang^{1, 2, 3, †}, Ding Chi-Biao^{1, 2, 3}

Schematic of the phase encoding and weak+vacuum decoy-state BB84 protocol QKD. IM: intensity modulator; BS: beam splitter; PM: phase modulator; EVOA: electronic variable optical attenuator; SPD: single-photon detector. The signal and decoy pulses are produced by IM. Two identical UMZIs in Alice and Bob play roles of encoder. An EVOA is used to attenuate the intensity of the laser pulses to the single-photon level.