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:
Feb. 21, 2006
Filed:
Oct. 03, 2003
Raymond G. Beausoleil, Redmond, WA (US);
William J. Munro, Bristol, GB;
Timothy P. Spiller, Bristol, GB;
Kae Nemoto, Tokyo, JP;
Sean D. Barrett, Bristol, GB;
Raymond G. Beausoleil, Redmond, WA (US);
William J. Munro, Bristol, GB;
Timothy P. Spiller, Bristol, GB;
Kae Nemoto, Tokyo, JP;
Sean D. Barrett, Bristol, GB;
Hewlett-Packard Development Company, L.P., Houston, TX (US);
Abstract
A device capable of efficiently detecting a single-photon signal includes a matter system, sources of a first beam and a second beam, and a measurement system. The matter system has a first energy level and a second energy level such that a signal photon couples to a transition between the first energy level and the second energy level. The first beam contains photons that couple to a transition between the second energy level and a third energy level of the matter system, and the second beam contains photons that couple to a transition between the third energy level and a fourth energy level of the matter system. The measurement system measures a change in the first or second beam to detect the absence, the presence, or the number of the photons in the signal.