Routing methods for quantum communication paths across a mesh quantum network

Patent metadata

Field	Value
Publication number	US-11716151-B2
Application number	US-202117382975-A
Country	US
Kind code	B2
Filing date	Jul 22, 2021
Priority date	Jul 22, 2021
Publication date	Aug 1, 2023
Grant date	Aug 1, 2023

Abstract

A method for routing in a quantum network is provided. The method may include receiving parameters including a fidelity with coherence decay time and an entanglement generation rate for each quantum node in a mesh quantum network by a controller, the controller being configured to communicate with each quantum node of a plurality of quantum nodes in the mesh quantum network. Each quantum node includes a quantum memory and a processor. The method may also include analyzing the fidelity with coherence decay time and the entanglement generation rate to yield a determination of a path fidelity with a path coherence decay time and a path entanglement generation rate between at least one pair of quantum nodes. The method may further include, based on the determination, selecting a quantum communication path from a source node to a destination node.

First claim

What is claimed is:

1. A method for routing in a quantum network, the method comprising:
receiving parameters comprising a fidelity with coherence decay time and an entanglement generation rate for each quantum node in a mesh quantum network by a controller, the controller being configured to communicate with each quantum node of a plurality of quantum nodes in the mesh quantum network, each quantum node comprising a quantum memory and a processor;
analyzing the fidelity with coherence decay time and the entanglement generation rate to yield a determination of a path fidelity with a path coherence decay time and a path entanglement generation rate between at least one pair of quantum nodes of the plurality of quantum nodes; and
based on the determination, selecting, through the mesh quantum network, a first quantum communication path from a source node to a destination node based upon a path fidelity of the first quantum communication path being greater than a minimum path fidelity for a quantum computing application.

2. The method of claim 1 , wherein the determination comprises the minimum path fidelity Fm and a minimum entanglement generation rate 1/T c for the quantum computing application.

3. The method of claim 2 , wherein selecting the first quantum communication path is based upon the path fidelity F p (t)=F p e −t/T F of the first quantum communication path being greater than the minimum path fidelity F m for the quantum computing application, wherein F p is an initial fidelity, and T F is a fidelity time constant.

4. The method of claim 3 , wherein the selecting the first quantum communication path is based upon a path entanglement generation rate 1/T p greater than 1/T c .

5. The method of claim 3 , wherein the selecting the first communication path further comprises selecting a second quantum communication path from the source node to the destination node based upon the path fidelity F p (t) of the first quantum communication path and a second path fidelity F p (t) of the second quantum communication path being greater than the minimum path fidelity F m for the quantum computing application and a combined entanglement generation rate 1/T p of the first quantum communication path and the second quantum communication path being greater than 1/T c .

6. The method of claim 5 , wherein the second quantum communication path has a same end point as the first quantum communication path.

7. The method of claim 1 , wherein the network further comprises a classical communication path between a plurality of classical nodes, where each of the plurality of classical nodes is located at a respective location of each of the plurality of quantum nodes, each classical node comprising a classical processor and a memory device.

8. The method of claim 1 , wherein the first quantum communication path between the source node and the destination node comprises at least one quantum link.

9. The method of claim 1 , further comprising teleporting by transferring a qubit is based upon a pair of entangled particles, in which a first entangled particle of the pair of entangled particles is at the source node and a second entangled particle of the pair of entangled particles is at the destination node, after completing quantum swapping that extends a distance between the first entangled particle and the second entangled particle using entanglement swapping repeaters from the source node to the destination node.

10. The method of claim 1 , wherein the selecting the first quantum communication path is based upon a highest margin of the fidelity for a quantum communication path.

11. The method of claim 1 , wherein the selecting the first quantum communication path is based upon a lowest margin of the fidelity for a quantum communication path.

12. The method of claim 1 , wherein the selecting the first quantum communication path is based upon a highest margin of the entanglement generation rate for a quantum communication path.

13. The method of claim 1 , wherein the selecting the first quantum communication path is based upon a lowest margin of the entanglement generation rate for a quantum communication path.

14. The method of claim 1 , wherein each of the plurality of quantum nodes comprises one particle of a first pair of entangled particles and one particle of a second pair of entangled particles.

15. A controller comprising:
one or more processors; and
a non-transitory computer readable medium comprising instructions stored therein, the instructions, when executed by the one or more processors, cause the processors perform operations comprising:
receiving parameters comprising a fidelity with coherence decay time and an entanglement generation rate for each quantum node in a mesh quantum network, the controller being configured to communicate with each quantum node of a plurality of quantum nodes in the mesh quantum network, each quantum node comprising a quantum memory and a processor;
analyzing the fidelity with coherence decay time and the entanglement generation rate to yield a determination of a path fidelity with a path coherence decay time and a path entanglement generation rate between at least one pair of quantum nodes; and
based on the determination, selecting, through the mesh quantum network, a quantum communication path from a source node to a destination node based upon a path fidelity of the first quantum communication path being greater than a minimum path fidelity for a quantum computing application.

16. The controller of claim 15 , wherein the determination comprises the minimum path fidelity F m and a minimum entanglement generation rate 1/T c for the quantum computing application.

17. The controller of claim 16 , wherein the selecting the quantum communication path is based upon the path fidelity F p (t)=F p e −t/T F greater than the minimum F m for the quantum computing application, wherein F p is an initial fidelity, and T F is a fidelity time constant.

18. The controller of claim 16 , wherein the selecting the quantum communication path is based upon a path entanglement generation rate 1/T p greater than 1/T.

19. A non-transitory computer readable medium comprising instructions, the instructions, when executed by a computing system, cause the computing system to perform operations comprising:
receiving parameters comprising a fidelity with coherence decay time and an entanglement generation rate for each quantum node in a mesh quantum network, the computing system being configured to communicate with each quantum node of a plurality of quantum nodes in the mesh quantum network, each quantum node comprising a quantum memory and a processor;
analyzing the fidelity with coherence decay time and the entanglement generation rate to yield a determination of a path fidelity with a path coherence decay time and a path entanglement generation rate between at least one pair of quantum nodes; and
based on the determination, selecting, through the mesh quantum network, a quantum communication path from a source node to a destination node based upon a path fidelity of the first quantum communication path being greater than a minimum path fidelity for a quantum computing application.

20. The non-transitory computer readable medium of claim 19 , wherein the determination comprises the minimum path fidelity F m and a minimum entanglement generation rate 1/T c for the quantum computing application, wherein the selecting of the quantum communication path is based upon a path entanglement generation rate 1/T p g

Assignees

• Cisco Tech Inc

Inventors

• Chiesa Luca Della
• Samuel Louis Gwyn
• Polakos Paul
• Fluhrer Scott
• Ganguly Santanu

Classifications

• H04B10/70 Primary

  Photonic quantum communication · CPC title

• H04B10/27

  Arrangements for networking · CPC title