Patent ID: 11933608
Assignee: QUBIT MOVING AND STORAGE, LLC
Field: Measurement (Instruments)
Classification: CPC G  H | IPC G

Claim 0:
1. A system for identifying a set of three entangled photons, the system comprising:
a) an optical source configured to generate a set of three entangled photons that are correlated in time, wherein a first entangled photon emerges at a first output, a second entangled photon emerges at a second output, and a third entangled photon emerges at a third output;
b) an optical interferometer comprising a beam splitter having a first input optically coupled to the first output of the optical source and a second input optically coupled to the second output of the optical source, the beam splitter configured to provide photons at a first and second output of the optical interferometer based on a difference in an optical path length between the first output of the optical source to the first input of the beam splitter and a second optical path between the second output of the optical source and the second input of the beam splitter;
c) a first optical detector optically coupled to the first output of the interferometer, the first optical detector generating an electrical signal at an output in response to detection of a photon;
d) a second optical detector optically coupled to the second output of the optical interferometer, the second optical detector generating an electrical signal at an output in response to detection of a photon;
e) a third optical detector optically coupled to the third output of the optical source and configured to produce an electrical signal at an output in response to detection of a photon; and
f) a processor having a first, a second, and a third input connected to the outputs of respective ones of the first, second, and third optical detectors, the processor determining a first photon coincidence from an electrical signal generated in response to detection of a photon at the first optical detector and an electrical signal generated in response to detection of a photon at the second optical detector, the processor further determining a second photon coincidence from an electrical signal generated in response to detection of a photon at the second optical detector and an electrical signal generated in response to detection of the photon at a third optical detector, thereby identifying the set of three entangled photons.