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Quantum cryptographic system with reduced data loss

Patent ·
OSTI ID:871443
 [1];  [2]
  1. 1309, Low Block, Lei Moon House Ap Lei Chau Estate, Hong Kong, HK
  2. Flat C, 42nd Floor, Tower 1, University Heights 23 Pokfield Road, Pokfulam, Hong Kong, HK
+ Show Author Affiliations

A secure method for distributing a random cryptographic key with reduced data loss. 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.

Research Organization:
Institute for Advanced Study, Princeton, NJ (United States)
DOE Contract Number:
FG02-90ER40542
Assignee:
Lo, Hoi-Kwong (1309, Low Block, Lei Moon House Ap Lei Chau Estate, Hong Kong, HK);Chau, Hoi Fung (Flat C, 42nd Floor, Tower 1, University Heights 23 Pokfield Road, Pokfulam, Hong Kong, HK)
Patent Number(s):
US 5732139
OSTI ID:
871443
Country of Publication:
United States
Language:
English

References (5)

Quantum Cryptography journal October 1992
Quantum cryptographic network based on quantum memories journal October 1996
Quantum cryptography based on Bell’s theorem journal August 1991
Bell's Inequality and Rejected-data Protocols for Quantum Cryptography journal August 1993
Experimental quantum cryptography journal January 1992

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