IP Library Granted Patent US 12,555,020
Granted Patent B2
US 12,555,020 · App. 18/299,819 · Granted Feb 17, 2026

Entangling photonic graphs

Inventors: Gil Semo (Tel-Aviv, IL); Ziv Aqua (Rehovot, IL); Oded Melamed (Shoham, IL); Dan Charash (Herzliya, IL); Serge Rosenblum (Rehovot, IL); Barak Dayan (Tel-Aviv, IL)
Assignees: Quantum Source Labs Ltd.; Yeda Research and Development Co. Ltd.
G06N10/40G06N10/20G21K5/00H10D48/383H10H20/812
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Quick Facts
Patent No.
US 12,555,020
App. No.
18/299,819
Granted
Feb 17, 2026
Kind
B2
Abstract

A quantum computing method includes initializing a state of a resonator-coupled quantum emitter, receiving at least two photonic graph states, selecting at least one photon from each graph state, feeding the selected photons through an entangling gate via the resonator-coupled quantum emitter, and disentangling the resonator-coupled quantum emitter from the selected photons. Each of the at least two photonic graph states contains at least two photons. The disentangling includes at least one of detecting the state of the resonator-coupled quantum emitter or mapping the state of the resonator-coupled quantum emitter to a state of an additional photon.

Claims (38)

1 . A quantum computing method, comprising:

initializing a state of a resonator-coupled quantum emitter configured to function as an entangling gate;

receiving at least two photonic graph states, each of the at least two photonic graph states representing a relationship between qubits associated with at least two photons contained therein;

selecting at least one photon from each graph state;

feeding the selected photons through a waveguide so that each selected photon interacts with the resonator-coupled quantum emitter; and

disentangling the resonator-coupled quantum emitter from the selected photons, wherein disentangling includes at least one of detecting the state of the resonator-coupled quantum emitter or mapping the state of the resonator-coupled quantum emitter to a state of an additional photon.

2 . The method of claim 1 , wherein the entangling gate is one of a controlled-Z gate (CZ gate), a controlled NOT gate (CNOT gate), a square root of a SWAP gate, or an imaginary SWAP gate (iSWAP gate).

3 . The method of claim 1 , wherein feeding the selected photons through an entangling gate occurs sequentially.

4 . The method of claim 1 , wherein the mapping is achieved by applying a SWAP gate on the quantum emitter and an additional photon.

5 . The method of claim 1 , wherein the initialized state of the resonator-coupled quantum emitter is an equal superposition of two ground states.

6 . The method of claim 1 , wherein the quantum emitter includes a stationary qubit capable of interacting with photons.

7 . The method of claim 1 , wherein the quantum emitter includes a superconducting qubit.

8 . The method of claim 1 , wherein the quantum emitter includes a quantum dot.

9 . The method of claim 1 , wherein the quantum emitter includes an atom that is neutral.

10 . The method of claim 1 , wherein the quantum emitter includes an atom that is an ion.

11 . The method of claim 1 , wherein the quantum emitter includes a rubidium atom or a cesium atom.

12 . The method of claim 1 , wherein the quantum emitter includes at least one of Strontium, Erbium, Ytterbium, Calcium, Barium, Beryllium, or Magnesium atom.

13 . A quantum computing system, comprising:

a resonator-coupled quantum emitter configured to function as an entangling gate;

a plurality of switches; and

at least one processor configured to control the plurality of switches to:

initialize a state of the resonator-coupled quantum emitter;

receive at least two photonic graph states, each of the at least two photonic graph states representing a relationship between qubits associated with at least two photons contained therein;

select at least one photon from each graph state;

feed the selected photons through a waveguide so that each selected photon interacts with the resonator-coupled quantum emitter; and

disentangle the resonator-coupled quantum emitter from the selected photons, wherein disentangling includes at least one of detecting the state of the resonator-coupled quantum emitter or mapping the state of the resonator-coupled quantum emitter to a state of an additional photon.

14 . The system of claim 13 , wherein the entangling gate is one of a controlled-Z gate (CZ gate), a controlled NOT gate (CNOT gate), a square root of a SWAP gate, or an imaginary SWAP gate (iSWAP gate).

15 . The system of claim 13 , wherein feeding the selected photons through an entangling gate occurs sequentially.

16 . The system of claim 13 , wherein the mapping is achieved by applying a SWAP gate on the quantum emitter and an additional photon.

17 . The system of claim 13 , wherein the initialized state of the resonator-coupled quantum emitter is an equal superposition of two ground states.

18 . The system of claim 13 , wherein the quantum emitter includes a stationary qubit capable of interacting with photons.

19 . The system of claim 13 , wherein the quantum emitter includes one of a superconducting qubit, a quantum dot, or an atom.

20 . A non-transitory computer-readable medium including instructions that, when executed by at least one processor, cause the at least one processor to carry out a quantum computing method, comprising:

initializing a state of a resonator-coupled quantum emitter configured to function as an entangling gate;

receiving at least two photonic graph states, each of the at least two photonic graph states representing a relationship between qubits associated with at least two photons contained therein;

selecting at least one photon from each graph state;

feeding the selected photons through a waveguide so that each selected photon interacts with the resonator-coupled quantum emitter; and

disentangling the resonator-coupled quantum emitter from the selected photons, wherein disentangling includes at least one of detecting the state of the resonator-coupled quantum emitter or mapping the state of the resonator-coupled quantum emitter to a state of an additional photon.

Assignments (3)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Mar 15, 2024
From: DAYAN, BARAK; AQUA, ZIV
To: YEDA RESEARCH AND DEVELOPMENT CO. LTD.
Reel/Frame 066786/0148 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Mar 14, 2024
From: SEMO, GIL; MELAMED, ODED; CHARASH, DAN
To: QUANTUM SOURCE LABS LTD.
Reel/Frame 066766/0862 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Mar 14, 2024
From: AQUA, ZIV; ROSENBLUM, SERGE; DAYAN, BARAK
To: YEDA RESEARCH AND DEVELOPMENT CO. LTD.
Reel/Frame 066766/0872 →
Priority Claims (1)
IL 282705 · Apr 27, 2021 · national
Continuity (3)
Continuation PCTIB2022000564 · Apr 27, 2022
Provisional Application 63320454 · Mar 16, 2022
Related Publication 20240256934A1 · Aug 1, 2024
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