US 12,015,700 B2
Quantum key distribution information leakage due to backflashes in single photon avalanche photodiodes
Daniel T. Stack, Thornton, CO (US); Stephen P. Pappas, Roxbury, CT (US); Brandon V. Rodenburg, Ewing Township, NJ (US); and Colin P. Lualdi, Weston, MA (US)
Assigned to The MITRE Corporation, McLean, VA (US)
Filed by The MITRE Corporation, McLean, VA (US)
Filed on Nov. 19, 2020, as Appl. No. 16/952,499.
Application 16/952,499 is a continuation of application No. 16/849,234, filed on Apr. 15, 2020, granted, now 10,855,456.
Application 16/849,234 is a continuation of application No. 15/702,085, filed on Sep. 12, 2017, granted, now 10,666,433, issued on May 26, 2020.
Prior Publication US 2021/0075602 A1, Mar. 11, 2021
This patent is subject to a terminal disclaimer.
Int. Cl. H04L 9/08 (2006.01); G01J 1/04 (2006.01); H04L 9/40 (2022.01); G01J 1/44 (2006.01)
CPC H04L 9/0852 (2013.01) [G01J 1/0429 (2013.01); H04L 63/1475 (2013.01); G01J 2001/442 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A method for calibrating a quantum cryptography apparatus, the method comprising:
emitting a photon at a wavelength from a photon emitter;
receiving the emitted photon with a photon receiver;
detecting a backflash of the emitted photon;
characterizing a polarization dependence of the backflash; and
calibrating the quantum cryptography apparatus based on the polarization dependence of the backflash,
wherein the calibrating comprises detecting correlations between a polarization state of the emitted photon and a polarization state of the backflash.