Cryptography – Communication system using cryptography – Fiber optic network
Reexamination Certificate
2007-09-25
2007-09-25
Zand, Kambiz (Department: 2134)
Cryptography
Communication system using cryptography
Fiber optic network
C380S255000, C380S277000
Reexamination Certificate
active
10195290
ABSTRACT:
A quantum cryptographic receiver, a method of achieving unambiguous state discrimination measurement of a coherent light state and a quantum cryptographic system incorporating the quantum cryptographic receiver or the method. In one embodiment, the quantum cryptographic receiver includes: (1) a beamsplitter that receives an incoming coherent state from a sender and splits the incoming coherent state into at least first and second separate coherent states and (2) at least one photodetector, associated with the beamsplitter, that is positionable with respect to the first and second separate coherent states to detect a presence of a photon therein at a particular phase, the presence revealing information originated by the sender.
REFERENCES:
patent: 5675648 (1997-10-01), Townsend
patent: 6289104 (2001-09-01), Patterson et al.
patent: 6801626 (2004-10-01), Nambu
“Making Unbreakable Code” by Justin Mullins; IEEE Spectrum; May 2002; pp. 40-45.
“Quantum Cryptography” by Nicolas Gisin, Gregoire Ribordy; Wolfgang Tittel and Hugo Zbinden; Sep. 18, 2001; submitted to Reviews of Modern Physics; pp. 1-57.
Lucent Technologies - Inc.
Tolentino Roderick
Zand Kambiz
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