Heralded narrowband single photons for differential-phase shift quantum key distribution

Le Wang, Shengmei Zhao

胡 康 Hu Kang, 毛钱萍 Mao Qianping, 赵生妹 Zhao Shengmei

Chang Liu, Shanchao Zhang, Luwei Zhao +5 more

We demonstrate differential-phase-shift quantum key distribution using narrowband heralded single photons with amplitude-phase modulations. We obtain a quantum bit error rate as low as 3.06% which meets the unconditional security requirement.

Tomoyuki Horikiri, Yuishi Takeno, Hideki Sasaki +3 more

Chang Liu, Shanchao Zhang, Luwei Zhao +5 more

We demonstrate the first proof of principle differential phase shift (DPS) quantum key distribution (QKD) using narrow-band heralded single photons with amplitude-phase modulations. In the 3-pulse case, we obtain a quantum bit error rate (QBER) as low as 3.06% which meets the unconditional security requirement. As we increase the pulse number up to 15, the key creation efficiency approaches 93.4%, but with a cost of increasing the QBER. Our result suggests that narrow-band single photons maybe a promising source for the DPS-QKD protocol.

何业锋 He Yefeng, 宋畅 Song Chang, 李东琪 Li Dongqi +1 more