Quantum cryptographic system with reduced data loss

Patent · Tue Mar 24 04:00:00 EST 1998

OSTI ID:597128

Lo, H K; Chau, H F

A secure method for distributing a random cryptographic key with reduced data loss is disclosed. Traditional quantum key distribution systems employ similar probabilities for the different communication modes and thus reject at least half of the transmitted data. The invention substantially reduces the amount of discarded data (those that are encoded and decoded in different communication modes e.g. using different operators) in quantum key distribution without compromising security by using significantly different probabilities for the different communication modes. Data is separated into various sets according to the actual operators used in the encoding and decoding process and the error rate for each set is determined individually. The invention increases the key distribution rate of the BB84 key distribution scheme proposed by Bennett and Brassard in 1984. Using the invention, the key distribution rate increases with the number of quantum signals transmitted and can be doubled asymptotically. 23 figs.

• Research Organization: Institute for Advanced Study
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: FG02-90ER40542
• Assignee: PTO; SCA: 990200; SN: 98001932714; PA: EDB-98:047230
• Patent Number(s): US 5,732,139/A/
• Application Number: PAN: 8-701,785
• OSTI ID: 597128
• Country of Publication: United States
• Language: English

Related Subjects

99 GENERAL AND MISCELLANEOUS
DATA PROCESSING
DATA TRANSMISSION
DESIGN
SECRECY PROTECTION
SECURITY