IP Library › Granted Patent US 12,693,157
Granted Patent B2
US 12,693,157 · App. 18/774,410 · Granted Jul 28, 2026

Superconducting photon detector

Inventors: Mark Thompson (Palo Alto, CA); Faraz Najafi (San Francisco, CA)
Assignee: PsiQuantum Corp.
G01J1/44G01J1/0407G02B6/4202H10N60/84G01J2001/442
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Quick Facts
Patent No.
US 12,693,157
App. No.
18/774,410
Filed
Jul 16, 2024
Granted
Jul 28, 2026
Kind
B2
Art Unit
2878
USPC
250/208.2
Abstract

An example multi-element photon detector includes a waveguide configured to guide a set of photons from a photon source, wherein the waveguide includes (i) a first coupling region, and (ii) a second coupling region. The example detector also includes a first photon detector coupled to the first coupling region and configured to detect individual photons from the first coupling region, the first photon detector arranged to have a first coupling efficiency with the waveguide. The example detector further includes a second photon detector coupled to the second coupling region and configured to detect individual photons from the second coupling region, the second photon detector arranged to have a second coupling efficiency with the waveguide, wherein the second coupling efficiency is greater than the first coupling efficiency such that the multi-element photon detector has a first probability of absorption across the first and second single photon detectors.

Claims (23)

1 . A multi-element photon detector, comprising:

a waveguide configured to guide a set of photons from a photon source, wherein the waveguide includes (i) a first coupling region, and (ii) a second coupling region;

a first photon detector coupled to the first coupling region and configured to detect individual photons from the first coupling region, the first photon detector arranged to have a first coupling efficiency with the waveguide; and

a second photon detector coupled to the second coupling region and configured to detect individual photons from the second coupling region, the second photon detector arranged to have a second coupling efficiency with the waveguide, wherein the second coupling efficiency is greater than the first coupling efficiency such that the multi-element photon detector has a first probability of absorption across the first and second photon detectors.

2 . The multi-element photon detector of claim 1 , wherein the waveguide is configured to guide a first percentage of the set of photons to the first coupling region, and guide a second percentage of the set of photons to the second coupling region, where the second percentage is different than the first percentage.

3 . The multi-element photon detector of claim 1 , wherein the first and second coupling regions are linear coupling regions.

4 . The multi-element photon detector of claim 3 , wherein the first coupling region has a first width, the second coupling region has a second width, and respective coupling coefficients of the first and second coupling regions are based on the first and second widths.

5 . The multi-element photon detector of claim 4 , wherein the first width is the same as the second width.

6 . The multi-element photon detector of claim 5 , wherein the respective coupling coefficient between the waveguide and the first photon detector is further based on a first length of the first coupling region.

7 . The multi-element photon detector of claim 1 , wherein the first photon detector has a linear detector portion that is adjacent to, and optically coupled with, the first coupling region.

8 . The multi-element photon detector of claim 7 , wherein the linear detector portion has a second length that is longer than a first length of the first coupling region, and the linear detecting portion spans the second coupling region.

9 . The multi-element photon detector of claim 1 , wherein a portion of the waveguide distinct from the first coupling region is substantially orthogonal to the first coupling region.

10 . The multi-element photon detector of claim 9 , wherein the portion of the waveguide is also substantially orthogonal to the second coupling region.

11 . The multi-element photon detector of claim 1 , wherein the waveguide is an optical waveguide.

12 . The multi-element photon detector of claim 1 , wherein the first and second photon detectors are superconducting single photon detectors.

13 . The multi-element photon detector of claim 1 , wherein the second photon detector has a different shape than the first photon detector.

14 . The multi-element photon detector of claim 1 , wherein at least one of the first photon detector and the second photon detector is a superconducting single photon detector configured to transition from a superconducting state to a non-superconducting state in response to receiving a single photon.

15 . The multi-element photon detector of claim 1 , wherein at least one of the first photon detector and the second photon detector includes a linear detector portion adapted to have a uniform current density.

16 . The multi-element photon detector of claim 1 , wherein the first photon detector and the waveguide are positioned and sized to allow light to adiabatically transfer from the waveguide to the first photon detector.

17 . The multi-element photon detector of claim 1 , wherein the first photon detector and the waveguide are positioned and sized to allow light to evanescently transfer from the waveguide to the first photon detector.

18 . The multi-element photon detector of claim 1 , wherein at least one of the first coupling region and the second coupling region has a tapered width.

19 . The multi-element photon detector of claim 1 , wherein each of the first coupling efficiency and the second coupling efficiency is greater than or equal to 90%.

20 . The multi-element photon detector of claim 1 , wherein the first coupling region is arranged upstream from the second coupling region such that the set of photons move through the first coupling region before moving through the second coupling region.

Continuity (5)
Continuation 17967773 · Oct 17, 2022
Continuation 16985137 · Aug 4, 2020
Continuation PCTUS2019016885 · Feb 6, 2019
Provisional Application 62627115 · Feb 6, 2018
Related Publication 20240369408A1 · Nov 7, 2024
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