High-speed data encryption over 25 km of fiber by two-mode coherent-state quantum cryptography.
We demonstrate high-speed (250 Mbps) data encryption over 25 km of telecommunication fiber by use of coherent states. For the parameter values used in the experiment, the demonstration is secure against individual ciphertext-only eavesdropping attacks near the transmitter with ideal detection equipment. Whereas other quantum-cryptographic schemes require the use of fragile quantum states and ultrasensitive detection equipment, our protocol is loss tolerant, uses off-the-shelf components, and is optically amplifiable.
Center for Photonic Communication and Computing, Department of Electrical and Computer Engineering, Northwestern University, Evanston, Illinois 60208, USA. corndorf@ece.northwestern.edu
Eric
E
Corndorf
Geraldo
G
Barbosa
Chuang
C
Liang
Horace P
HP
Yuen
Prem
P
Kumar