Zheng-Fu Han

TL;DR: In this article, a whispering gallery mode with quality factor of 106 in the 1480 nm band is demonstrated and the dependence of the resonance shifts on the input power is investigated in both the transient (blueshift) and the steady-state (redshift) regimes.

TL;DR: A wide area quantum key distribution (QKD) network deployed on communication infrastructures provided by China Mobile Ltd. is demonstrated and the effective integration between point-to-point QKD techniques and networking schemes is realized.

TL;DR: A demonstration of quantum key distribution (QKD) over a standard telecom fiber exceeding 50 dB in loss and 250 km in length is reported, with careful optimization of the 1 bit delayed Faraday-Michelson interferometer and the use of the superconducting single photon detector (SSPD).

TL;DR: In this article, the authors proposed a wavelength-dependent attacking protocol, which can be applied to all practical QKD systems with passive state modulation, and experimentally attack a practical polarization encoding Q-KD system to obtain all the secret key information at the cost of only increasing the quantum bit error rate from 1.3$ to 1.4%.

TL;DR: In this article, a new protocol for distributing keys in a quantum network overcomes theoretical bounds for key transmission rates, potentially enabling the implementation of secure communication in large networks in large quantum networks.