Patent ID: 11936782
Assignee: ARIZONA BOARD OF REGENTS ON BEHALF OF NORTHERN ARIZONA UNIVERSITY
Field: Telecommunications (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A method, comprising:
receiving incoming photons representing digit values of a datastream that includes at least three distinct digit values, the incoming photons including photons having a first wavelength and photons having a second wavelength;
selecting between first and second measurement bases for each photon, each measurement basis defining a pair mutually orthogonal polarization axes;
performing a polarization measurement on each photon that determines a polarization axis of that photon in the measurement basis selected for that photon and a wavelength of that photon; and
decoding the datastream using the wavelength and polarization of each of the polarized photon, including generating a signal indicating whether at least a portion of the datastream was altered;
wherein the first measurement basis defines, for each of the first and second wavelengths, a first polarization axis in a plane for that wavelength and a second polarization axis in that plane that is perpendicular to the first polarization axis for that wavelength;
wherein the second measurement basis defines, for each of the first and second wavelengths, a third polarization axis in the plane for that wavelength and a fourth polarization axis in the plane for that wavelength that is perpendicular to the third polarization axis for that wavelength; and
wherein the third and the fourth polarization axes for each wavelength are equally-weighted vector combinations of the first and second polarization axes for that wavelength.