A joint research team led by PAN Jianwei from the University of Science and Technology of China (USTC) has demonstrated a quantum-key distribution protocol that aims for immunity against both known and unknown threats. It is based on high-speed independent laser interference technology combined with high-efficiency, low-noise superconducting nanowire single-photon detectors. 

This protocol extends the secure transmission distance of measurement-device-independent quantum key distribution to 200 km and achieves a secure key rate three orders of magnitude higher. 

These results pave the way for a quantum network with measurement-device-independent security. 

The study was published in Physical Review Letters.

Related Article: