US 12,250,026 B2
Photon number resolving methods and systems
Lars Madsen, Toronto (CA); Fabian Laudenbach, Toronto (CA); and Jonathan Lavoie, Toronto (CA)
Assigned to XANADU QUANTUM TECHNOLOGIES INC., Toronto (CA)
Filed by XANADU QUANTUM TECHNOLOGIES INC., Toronto (CA)
Filed on Nov. 28, 2022, as Appl. No. 17/994,953.
Claims priority of provisional application 63/291,071, filed on Dec. 17, 2021.
Prior Publication US 2023/0198632 A1, Jun. 22, 2023
Int. Cl. H04B 10/00 (2013.01); H04B 10/70 (2013.01); H04J 14/00 (2006.01)
CPC H04B 10/70 (2013.01) 20 Claims
OG exemplary drawing
 
1. A photon-number resolving (PNR) method comprising:
calibrating a PNR detector to generate a characteristic pulse plot for each of a plurality of photon numbers;
receiving, by the PNR detector, a signal including a first pulse and a second pulse, where the second pulse at least partially overlaps with the first pulse;
determining a first photon number of the first pulse;
subtracting a characteristic plot that corresponds to the first photon number from the first pulse of the received electrical signal plot;
determining a second photon number of the second pulse; and
storing the first and second photon numbers.