Measurement-device-independent quantum key distribution over untrustful metropolitan network

30 Sep 2015  ·  Tang Yan-Lin, Yin Hua-Lei, Zhao Qi, Liu Hui, Sun Xiang-Xiang, Huang Ming-Qi, Zhang Wei-Jun, Chen Si-Jing, Zhang Lu, You Li-Xing, Wang Zhen, Liu Yang, Lu Chao-Yang, Jiang Xiao, Ma Xiongfeng, Zhang Qiang, Chen Teng-Yun, Pan Jian-Wei ·

Quantum cryptography holds the promise to establish an information-theoretically secure global network. All field tests of metropolitan-scale quantum networks to date are based on trusted relays... The security critically relies on the accountability of the trusted relays, which will break down if the relay is dishonest or compromised. Here, we construct a measurement-device-independent quantum key distribution (MDIQKD) network in a star topology over a 200 square kilometers metropolitan area, which is secure against untrustful relays and against all detection attacks. In the field test, our system continuously runs through one week with a secure key rate ten times larger than previous result. Our results demonstrate that the MDIQKD network, combining the best of both worlds --- security and practicality, constitutes an appealing solution to secure metropolitan communications. read more

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Quantum Physics