Quantum key distribution protocol without monitoring for a disturbance

Toshihiko Sasaki, Y. Yamamoto, Masato Koashi

Hiroki Takesue, Toshihiko Sasaki, Kiyoshi Tamaki +1 more

Shuang, Zhang, Guo Guo +17 more

Shuang Wang, Zhen−Qiang Yin, Wei Chen +7 more

Masato Koashi

Conventional quantum key distribution (QKD) schemes determine the amount of leaked information through estimation of signal disturbance. Here we present a QKD protocol based on an entirely different principle, which works without monitoring the disturbance. The protocol is implemented with a laser, an interferometer with a variable delay, and photon detectors. It is capable of producing a secret key when the bit error rate is high and the communication time is short.

Masato Koashi

Conventional quantum key distribution (QKD) schemes determine the amount of leaked information through estimation of signal disturbance. Here we present a QKD protocol based on an entirely different principle, which works without monitoring the disturbance.