US 12,259,274 B2
Spectrally multiplexed single-photon emitter
Niall Moroney, London (GB); Robert Francis-Jones, London (GB); and Paris Andreades, London (GB)
Assigned to ORCA Computing Limited, London (GB)
Filed by ORCA Computing Limited, London (GB)
Filed on Oct. 13, 2022, as Appl. No. 17/965,692.
Claims priority of application No. 2210163 (GB), filed on Jul. 11, 2022.
Prior Publication US 2024/0011829 A1, Jan. 11, 2024
Int. Cl. G01J 1/44 (2006.01); G01J 1/04 (2006.01); G02F 1/21 (2006.01); G02F 1/35 (2006.01); G02F 1/39 (2006.01)
CPC G01J 1/44 (2013.01) [G01J 1/0418 (2013.01); G01J 1/0459 (2013.01); G01J 1/0488 (2013.01); G02F 1/212 (2021.01); G02F 1/3503 (2021.01); G02F 1/3526 (2013.01); G02F 1/353 (2013.01); G02F 1/39 (2013.01); G01J 2001/442 (2013.01); G02F 2203/48 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A system for producing an output photon having a predefined frequency, the system comprising:
a pump module comprising one or more pump laser sources, the pump module configured to produce pump fields at a plurality of pump frequencies;
a photon pair source configured to generate a frequency-correlated photon pair;
a detector module comprising one or more photon detectors, the detector module configured to generate a heralding signal subsequent to detecting a first photon of the frequency-correlated photon pair, the heralding signal indicative of a frequency of a second photon of the frequency-correlated photon pair;
a pump field selector configured to:
receive the heralding signal from the detector module; and
select, based on the received heralding signal, at least one pump field of the pump fields;
a controller configured to control the pump field selector to select the at least one pump field subsequent to receiving the heralding signal; and
a non-linear photonic element comprising a beam combiner with non-linear material, the non-linear photonic element configured to receive the second photon and the selected at least one pump field, the non-linear photonic element configured to produce the output photon having the predefined frequency;
wherein:
the non-linear photonic element has different conversion efficiencies for different frequencies of heralded second photons; and
in the event of a contemporaneous detection of two first photons of two frequency-correlated photon pairs, the two first photons having different frequencies, the controller is configured to control the pump field selector to select the at least one pump field based further on the conversion efficiencies of the non-linear photonic element.