Optical communications – Transmitter and receiver system
Reexamination Certificate
2007-11-27
2007-11-27
Chan, Jason (Department: 2613)
Optical communications
Transmitter and receiver system
C398S152000, C398S183000
Reexamination Certificate
active
11009845
ABSTRACT:
A system parametrically down-converts a photon into a pair of first and second quantum-entangled photons. A transmitter is coupled to receive the first photon and includes an irreversible collapse event device for collapsing the quantum-entangled state of each photon in the pair. The collapse is caused by attempting to detect the first photon at the transmitter. Because of quantum-entanglement, collapse of the first photon collapses the second photon of the pair. The transmitter can also be used to not cause the collapse. A receiver includes polarization detectors to detect whether the transmitter has collapsed or left uncollapsed the quantum-entangled state of the photon pair. Causing or not causing the collapse can be used for communication. Every down-converted photon can be used for communication, even though few of the photons actually leave the source and reach the transmitter. This allows communication with a minimal number of transmitted photons.
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Lasher Markham E.
Roberts Mark W.
Anderson J. Eric
Chan Jason
Lee Allan Y.
Lipovsky Peter A.
United States of America as represented by the Secretary of the
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