Photonic Graph Entangling Gate Using a Resonator-Coupled Emitter

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Solution Overview

Problem

Current photonic quantum computing platforms face inefficiencies in generating entangled photonic states due to probabilistic processes, limiting scalability to practical numbers of qubits.

Innovation Solution

A cavity quantum electrodynamics (Cavity QED) mechanism that deterministically generates photonic graph states using a combination of matter-based and light-based quantum computation mechanisms, enabling efficient entanglement of photons in a scalable architecture.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If probabilistic entangling processes are used in conventional photonic quantum computing, then entangled photonic states can be generated, but the generation efficiency is highly inefficient and scalability is limited

Engineering Contradiction:

Improvegeneration efficiency of entangled photonic statesVSAvoidscalability to practical numbers of qubits

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent replaces the conventional mechanical/optical probabilistic entangling process with a matter-based quantum computation mechanism. Specifically, it uses a hybrid approach where matter qubits (such as trapped ions or quantum dots) serve as deterministic sources of entangled photonic states, substituting the unreliable probabilistic optical process with a controlled matter-based generation mechanism that achieves near-deterministic entanglement production.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent introduces matter-based qubits as an intermediary between the photonic platform and the entanglement generation process. The matter qubits act as mediators that receive classical control signals, generate entangled photonic states deterministically, and transfer quantum information to the photonic qubits, thereby enabling efficient scaling while maintaining the advantages of the photonic platform.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Ease of manufacture

If linear optics elements are used to entangle photons probabilistically, then photonic graph states can be produced, but a much larger number of initial single photons and elements are required

Engineering Contradiction:

Improveuse of readily available fabrication technologiesVSAvoidnumber of elements required for entanglement generation

Core Design Contradiction:

Ease of manufactureVSDevice complexity

Solution Approach 1:

The patent segments the entanglement generation function into distinct modular units: matter-based quantum emitters (such as trapped ions or quantum dots) that serve as deterministic sources, coupled with photonic components. Each matter-based emitter independently generates entangled photonic pairs, allowing the system to scale by simply adding more modular units rather than increasing the complexity of individual elements.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The matter-based quantum emitters serve multiple functions: they act as deterministic single-photon sources, entanglement generators, and interfaces between classical and quantum domains. This multi-functionality reduces the overall number of specialized components needed in the system, simplifying the device architecture while maintaining manufacturing compatibility with existing technologies.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

This approach allows for the generation of high-efficiency entangled photons, suitable for use as qubits in quantum computers, overcoming scalability limitations and reducing the need for probabilistic processes.

Implementation Method 1

A cavity quantum electrodynamics (Cavity QED) mechanism that deterministically generates photonic graph states

Methodology Applied

Scientific EffectCavity quantum electrodynamics:

Implementation Method 2

quantum emitters associated with each coupling location are configured to mediate interactions between consecutive incoming photonic qubits to generate a graph state

Methodology Applied

Scientific EffectQuantum entanglement:

Data Source

PatentUS12555020B2Entangling photonic graphs

Publication Date: 2026.02.17 YEDA RES & DEV CO LTD

AI summary

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.