Quantum Mesh Routing Using Fidelity and Coherence Constraints

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Solution Overview

Problem

Existing routing protocols in quantum networking do not adequately address the specific constraints of quantum networking technology, particularly in mesh quantum networks, which require efficient selection of quantum communication paths based on parameters like fidelity and coherence decay time.

Innovation Solution

A routing protocol that selects quantum communication paths in a mesh quantum network by analyzing fidelity with coherence decay time and entanglement generation rate, using a controller to determine an optimal path for quantum channel establishment through entanglement swapping and teleporting.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If quantum communication paths are selected without considering fidelity and coherence decay time parameters, then routing complexity is reduced, but communication reliability deteriorates

Engineering Contradiction:

Improvequantum communication reliabilityVSAvoidrouting protocol complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The routing protocol performs preliminary analysis of fidelity and coherence decay time parameters for all possible quantum communication paths before actual quantum communication occurs. The controller pre-calculates path qualities and pre-selects optimal paths, so that when quantum communication needs to occur, the reliable path is already determined, avoiding real-time complexity while ensuring reliability

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent replaces complex real-time quantum state monitoring and path selection with a classical control system that uses pre-collected parameter data (fidelity, coherence decay time) to make routing decisions. This substitution of classical computation for quantum measurement reduces operational complexity while maintaining communication reliability

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Measurement precision

If multiple path parameters (fidelity, coherence decay time, entanglement generation rate) are analyzed, then path selection accuracy is improved, but processing time increases

Engineering Contradiction:

Improvepath evaluation accuracyVSAvoidpath selection time

Core Design Contradiction:

Measurement precisionVSLoss of time

Solution Approach 1:

The controller pre-analyzes and stores fidelity, coherence decay time, and entanglement generation rate parameters for all quantum nodes and links in the network before path selection is needed. This preliminary data collection and processing eliminates the need for real-time multi-parameter analysis, achieving high path evaluation accuracy without time loss during actual communication

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The routing protocol performs comprehensive multi-parameter analysis of all possible paths in advance (excessive action), then uses this pre-computed information for rapid path selection. The full parameter analysis is done once beforehand, allowing subsequent path selections to be made quickly without repeating the complete analysis

Inventive Principle:

Principle #16Partial or excessive action

3Length of stationary object

If quantum repeaters are used to extend transmission distance, then communication distance is improved, but path fidelity deteriorates due to multiple entanglement swapping operations

Engineering Contradiction:

Improvecommunication distanceVSAvoidpath fidelity

Core Design Contradiction:

Length of stationary objectVSReliability

Solution Approach 1:

The routing protocol pre-evaluates the cumulative fidelity impact of multiple entanglement swapping operations required for long-distance communication through quantum repeaters. By calculating path fidelity based on individual link fidelities and coherence decay times before communication occurs, the system can identify and select long-distance paths that maintain acceptable fidelity levels

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The controller acts as an intermediary that coordinates entanglement swapping operations across multiple quantum repeaters along the selected path. It manages the sequence of swapping operations and timing to minimize fidelity degradation, ensuring that the cumulative effect of multiple swaps maintains the required path fidelity for reliable quantum communication

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS12506544B2Routing methods for quantum communication paths across a mesh quantum network

Publication Date: 2025.12.23 CISCO TECHNOLOGY INC

AI summary

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.