Quantum tomography and photon source optimization

Patent metadata

Field	Value
Publication number	US-12199683-B2
Application number	US-202218080986-A
Country	US
Kind code	B2
Filing date	Dec 14, 2022
Priority date	Jun 22, 2020
Publication date	Jan 14, 2025
Grant date	Jan 14, 2025

Abstract

A quantum computing system includes a photon processing system, a photon analyzer, and a photon source module coupled to the photon processing system and to the photon analyzer. The photon source module includes at least one photon source configured to discharge one or more photons per trigger signal and a photon multiplexer configured to direct the one or more photons to the photon processing system or to the photon analyzer.

First claim

What is claimed is:

1. A quantum computing system comprising:
a plurality of photon pair sources, each of the plurality of photon pair sources comprising:
a photon source configured to generate a photon pair comprising a signal photon and a herald photon in response to a trigger signal;
a splitter comprising a splitter input port, a first splitter output port, and a second splitter output port, wherein the splitter input port is coupled to the photon source and the splitter is configured to output the signal photon at the first splitter output port and the herald photon at the second splitter output port;
a detector comprising a detector input port coupled to the second splitter output port and configured to detect the herald photon; and
a photon detection switch comprising a switch input port, a first switch output port, and a second switch output port, wherein the switch input port is coupled to the first splitter output port; and

a photon multiplexer comprising a plurality of photon routing switches, wherein each of the plurality of photon routing switches corresponds to one of the plurality of photon pair sources and comprises:
an input port coupled to the first switch output port of the corresponding photon detection switch;
a first multiplexer output port coupled to a photon analyzer; and
a second output port coupled to a photon processing system.

2. The quantum computing system of claim 1 wherein
each of the plurality of photon pair sources is configured to concurrently discharge one or more signal photons per trigger signal.

3. The quantum computing system of claim 1 , further comprising a crossover switch coupled to the photon multiplexer, the photon processing system, and the photon analyzer.

4. The quantum computing system of claim 1 wherein the photon multiplexer is
configured to simultaneously output a first plurality of discharged photons to the photon processing system and a second plurality of discharged photons to the photon analyzer.

5. The quantum computing system of claim 1 , further comprising at least one internal clock synchronized to an external clock.

6. The quantum computing system of claim 1 wherein the photon multiplexer directs the signal photon to the photon processing system when the photon source module discharges one signal photon per trigger signal.

7. The quantum computing system of claim 1 wherein the photon multiplexer directs one of the signal photon to the photon analyzer when the photon source module discharges two or more signal photons per trigger signal.

8. The quantum computing system of claim 1 wherein the photon processing system is a resource state generator.

9. The quantum computing system of claim 1 wherein the photon processing system is configured to output photons in an entangled state.

10. The quantum computing system of claim 1 wherein the plurality of photon pair sources is a plurality of spatially multiplexed photon pair sources.

11. The quantum computing system of claim 1 wherein the plurality of photon pair sources is a plurality of temporally multiplexed photon pair sources.

Assignees

• Psiquantum Corp

Inventors

• Wang Albert

Classifications

• G06N10/00

  Quantum computing, i.e. information processing based on quantum-mechanical phenomena · CPC title

• H04B10/70 Primary

  Photonic quantum communication · CPC title

• G06N10/40 Primary

  Physical realisations or architectures of quantum processors or components for manipulating qubits, e.g. qubit coupling or qubit control · CPC title