Quantum key distribution using non-orthogonal macroscopic signal

Details Quantum key distribution using non-orthogonal macroscopic signal Quantum key distribution using non-orthogonal macroscopic signal

1993-11-24

1996-05-07

Cain, David C.

Cryptography

Particular algorithmic function encoding

Nbs/des algorithm

380 44, 359112, H04L 900

Patent

active

055154387

ABSTRACT:
Quantum key distribution (QKD) uses non-orthogonal quantum states to distribute random information, suitable for use as a key for encryption and authentication, between two users who share secret information initially, with the assurance, based on the uncertainty principle, that it is unknown to anyone else. The present invention, which can be used with a fiberoptic channel or an unguided light beam, differs from previous QKD schemes in using macroscopic signals instead of single photons. The invention solves the problem of stray light and cost by using signals which are more efficient, and less noisy than photon-counting detectors at the wavelengths where optical fibers are most transparent.

REFERENCES:
patent: 4866699 (1989-09-01), Brackett et al.
patent: 4879763 (1989-11-01), Wood
patent: 4903339 (1990-02-01), Solomon
patent: 4965856 (1990-10-01), Swanic
patent: 5140636 (1992-08-01), Albares
patent: 5191614 (1993-03-01), LeCong
patent: 5307410 (1994-04-01), Bennett

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