Experimental transmission of quantum digital signatures over 90  km of installed optical fiber using a differential phase shift quantum key distribution system.
Quantum digital signatures (QDSs) apply quantum mechanics to the problem of guaranteeing message integrity and non-repudiation with information-theoretical security, which are complementary to the confidentiality realized by quantum key distribution (QKD). Previous experimental demonstrations have been limited to transmission distances of less than 5 km of optical fiber in a laboratory setting. Here we report, to the best of our knowledge, the first demonstration of QDSs over installed optical fiber, as well as the longest transmission link reported to date. This demonstration used a 90 km long differential phase shift QKD to achieve approximately one signed bit per second, an increase in the signature generation rate of several orders of magnitude over previous optical fiber demonstrations.
Robert J
RJ
Collins
Ryan
R
Amiri
Mikio
M
Fujiwara
Toshimori
T
Honjo
Kaoru
K
Shimizu
Kiyoshi
K
Tamaki
Masahiro
M
Takeoka
Erika
E
Andersson
Gerald S
GS
Buller
Masahide
M
Sasaki