Patent · US Expired

METHOD FOR CHANGING THE POLARIZATION OF AT LEAST ONE OF THE PHOTONS EMITTED FROM A PHOTON-PAIR SOURCE INTO VARIOUS PARTIAL PATHS OF RAYS, AND METHOD FOR OPTIONALLY GENERATING INDIVIDUAL PHOTONS OR PHOTON PAIRS IN AN OPTICAL CHANNEL

US6884990B2 · kind B2 · utility

0Cited by

3References

9Claims

0Family size

Assignee

DEUTSCHE TELEKOM AG · DE

Inventors

Wolfgang Dultz · Frankfurt am Main, DE
Heidrun Schmitzer · Grünhain, DE
Kay Michael Schmid · Frankfurt am Main, DE
Helmar A. Becker · Hanau, DE

Key dates

Filing date	Feb 21, 2001
Grant date	Apr 26, 2005
Priority date	—
Expiry date	Jul 16, 2021

Classification

Technology area (CPC G)Physics
CPC primaryG02F2203/07
WIPO fieldOptics
WIPO sectorInstruments

Abstract

A method is provided for changing the polarization of at least one of the photons emitted from a photon pair source into various partial ray paths using an electro-optical modulator (EOM), which is positioned in the particular partial ray path being traversed by the photon to be influenced and which, in the activated state, is able to alter the polarization of a photon, the modulator being activated as a function of time such that the probability that the photon is found in the region of the electro-optical modulator in the activated state is at a maximum.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.