Experimental demonstration of kilometer-range quantum digital signatures

Donaldson, Ross J. and Collins, Robert J. and Kleczkowska, Klaudia and Amiri, Ryan and Wallden, Petros and Dunjko, Vedran and Jeffers, John and Andersson, Erika and Buller, Gerald S. (2016) Experimental demonstration of kilometer-range quantum digital signatures. Physical Review A, 93 (1). 012329. ISSN 1050-2947 (https://doi.org/10.1103/PhysRevA.93.012329)

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We present an experimental realization of a quantum digital signature protocol which, together with a standard quantum key distribution link, increases transmission distance to kilometer ranges, three orders of magnitude larger than in previous realizations. The bit rate is also significantly increased compared with previous quantum signature demonstrations. This work illustrates that quantum digital signatures can be realized with optical components similar to those used for quantum key distribution and could be implemented in existing quantum optical fiber networks.