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

Claim 8:
9. The device of claim 8, wherein the processor is further configured to:
perform the polarization measurement on a first portion of the incoming photons according to the first measurement basis and on a second portion of the incoming photons according to the second measurement basis for each wavelength;
determine, according to the polarization measurement, a number erratic of photons of the first portion having the second wavelength having a measured polarization axis that differs from an expected polarization axis of the first measurement basis for the second wavelength;
determine, according to the polarization measurement, a number of erratic photons of the second portion having the first wavelength that have a measured polarization axis that differs from an expected polarization axis of the first measurement basis for the second wavelength; and
generate the signal indicating whether at least a portion of the datastream was altered by causing the signal to indicate whether a sum of the number of erratic photons of the first portion and the number of erratic photons of the second portion exceeds a predetermined threshold.