Patent ID: 8737841
Filing Date: 2014-05-27
Classification: H04B

Abstract:
1. a method of communication comprising; a step that a first photon and a second photon in an entangled state of polarization are prepared; a step that the first photon is sent to a sender, and the second photon is sent to a receiver; a step that the sender measures the first photon after the passage of the first photon through a polarizer in which a vertical polarized photon can pass when the sender sends a signal “1”, while the sender measures the first photon after the passage of the first photon through a polarizer in which a 45 degrees polarized photon can pass when the sender sends a signal “0”; a step that the receiver mixes the second photon with a local oscillator light in a half beam splitter, and generates a first output light and a second output light; a step that the receiver measures the intensity of said first output light and the intensity of said second output light, and derives a signal value which is the difference of those; a step that the receiver obtains an absolute value of the signal value.