Measurement-Device-Independent Quantum Key Distribution over 200 km
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- 6 November 2014
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 113 (19), 190501
- https://doi.org/10.1103/physrevlett.113.190501
Abstract
Measurement-device-independent quantum key distribution (MDIQKD) protocol is immune to all attacks on detection and guarantees the information-theoretical security even with imperfect single-photon detectors. Recently, several proof-of-principle demonstrations of MDIQKD have been achieved. Those experiments, although novel, are implemented through limited distance with a key rate less than . Here, by developing a 75 MHz clock rate fully automatic and highly stable system and superconducting nanowire single-photon detectors with detection efficiencies of more than 40%, we extend the secure transmission distance of MDIQKD to 200 km and achieve a secure key rate 3 orders of magnitude higher. These results pave the way towards a quantum network with measurement-device-independent security.
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Funding Information
- National Natural Science Foundation of China
- Chinese Academy of Sciences
- National Fundamental Research Program (2011CB921300, 2013CB336800, 2011CBA00300)
- Shandong Institute of Quantum Science & Technology
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