The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 15, 2010
Filed:
Oct. 30, 2006
Tatsuya Tomaru, Hatoyama, JP;
Tatsuya Tomaru, Hatoyama, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
For conventional cipher communications based on the principles of quantum mechanics, the photon number per signal needs to be controlled below 1 or to a mesoscopic level in order to make quantum-mechanical properties remarkable. This invention is intended to provide a quantum-mechanical communications' method that is practical even with a macroscopic number of photons. Antisqueezed light is transmitted using a random sender basis. The legitimate recipient can use a secret key to know the random sender basis, and thus to receive the information accurately without being affected by antisqueezing. However, because eavesdroppers unknowing of the sender basis must use haphazard bases in an attempt to receive the signals, the eavesdroppers are significantly affected by antisqueezing and the respective signal bit-error-rates are increased. This makes eavesdropping impossible, thus ensuring secure communications between the legitimate senders and recipients.