| US 7,539,308 B2 | ||
| Quantum steganography | ||
| Ralph S. Conti, Ypsilanti, Mich. (US); Kenneth A. Augustyn, Plymouth, Mich. (US); and Keith Kastella, Gregory, Mich. (US) | ||
| Assigned to General Dynamics Advanced Information Systems, Inc., Arlington, Va. (US) | ||
| Filed on May 21, 2004, as Appl. No. 10/849,789. | ||
| Claims priority of provisional application 60/472731, filed on May 23, 2003. | ||
| Claims priority of provisional application 60/529743, filed on Dec. 17, 2003. | ||
| Prior Publication US 2004/0258421 A1, Dec. 23, 2004 | ||
| Int. Cl. H04K 1/00 (2006.01) | ||
| U.S. Cl. 380—256 | 37 Claims |
| 1. A method of detecting at least one bit of information, the bit of information being manifested on entangled photons, the
method comprising:
producing entangled photons, the entangled photons comprising a first photon and a second photon, the first photon entangled
with the second photon;
modulating at least one bit of information onto at least one entangled photon parameter to produce modulated entangled photons,
wherein the parameter is an entanglement time, a relative frequency of the first photon and the second photon, a polarization
of the first photon and the second photon, a sum of frequencies of the first photon and the second photon, or a momentum of
the first photon and the second photon;
transmitting the modulated entangled photons;
receiving at least a portion of the modulated entangled photons;
detecting a value of the at least one entangled photon parameter in at least one set of entangled photons received by said
receiving, wherein said detecting comprises detecting an entangled photon absorption by a material configured to absorb entangled
photons and be substantially transparent to random photons; and
discerning the at least one bit of information based on said detecting.
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