Atom-Cavity Photonic Resource for Deterministic Graph State Generation

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Current photonic quantum computing faces inefficiencies in generating entangled photonic states due to probabilistic processes, limiting the scalability of quantum computers to handle large numbers of qubits for practical applications.

Innovation Solution

A deterministic photonic graph state generator using cavity quantum electrodynamics (Cavity QED) mechanisms, which combines deterministic single photon generation with cavity-enhanced photon-atom entanglement to produce time-sequenced entangled photons, enabling the creation of multi-dimensional cluster states of entangled photons.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If probabilistic processes are used to generate entangled photonic states, then device complexity is reduced, but generation efficiency deteriorates

Engineering Contradiction:

Improvecomplexity of entanglement generation processVSAvoidefficiency of entangled photon generation

Core Design Contradiction:

Device complexityVSProductivity

Solution Approach 1:

The patent replaces probabilistic linear optical processes with a deterministic cavity quantum electrodynamics mechanism. A single atom trapped in an optical cavity deterministically generates entangled photon pairs through controlled atomic transitions, eliminating the need for probabilistic nonlinear crystal processes and subsequent post-selection, thereby achieving near-unity generation efficiency while maintaining manageable device complexity

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent changes the fundamental mechanism from probabilistic to deterministic by utilizing cavity-enhanced atom-photon interactions. By controlling atomic energy levels and cavity resonance conditions, the system achieves deterministic entangled photon generation with predictable timing and phase relationships, transforming the generation process from a statistical outcome to a controllable quantum process

Inventive Principle:

Principle #35Parameter changes

2Manufacturing precision

If linear optics elements are used for probabilistic entanglement, then manufacturing precision requirements are reduced, but generation efficiency deteriorates

Engineering Contradiction:

Improveprecision of optical elementsVSAvoidefficiency of photonic graph state generation

Core Design Contradiction:

Manufacturing precisionVSProductivity

Solution Approach 1:

The patent substitutes linear optics-based probabilistic entanglement with a cavity QED-based deterministic mechanism. The optical cavity provides strong coupling between a single atom and photonic modes, enabling deterministic generation of entangled photons without requiring complex arrays of linear optics elements, thereby achieving high generation efficiency with moderate manufacturing precision requirements

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Reliability

If more initial single photons are used to achieve desired entangled state, then entanglement quality is improved, but device complexity and resource requirements deteriorate

Engineering Contradiction:

Improvequality of entangled photonic stateVSAvoidnumber of photons and elements required

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent replaces the approach of using multiple photons with probabilistic entanglement with a deterministic single-atom cavity QED system. A single atom in a cavity deterministically generates entangled photon pairs through controlled transitions, eliminating the need to collect and entangle multiple photons, thereby achieving high-fidelity entangled states with minimal resource requirements and simplified device architecture

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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 enhances the efficiency of entangled photon generation, allowing a higher percentage of produced photons to be usable as qubits, thereby facilitating the scalability of photonic quantum computing architectures.

Implementation Method 1

The present disclosure relates generally to quantum computing using cavity quantum electrodynamics (Cavity QED), and related apparatuses, systems, computer readable media, and methods

Methodology Applied

Scientific EffectCavity quantum electrodynamics (Cavity QED):

Implementation Method 2

combines deterministic single photon generation with cavity-enhanced photon-atom entanglement to produce time-sequenced entangled photons

Methodology Applied

Scientific EffectQuantum entanglement:

Data Source

PatentUS12141659B2Resource for quantum computing

Publication Date: 2024.11.12 YEDA RES & DEV CO LTD

AI summary

A quantum computing system, method and computer readable medium involve a vacuum chamber, an atom source input associated with the vacuum chamber, a Photonic Integrated Circuit (PIC) having an interaction region configured to interact with an atom from the atom source, a coupling location for atom positioning, a trapping laser for trapping the atom in the coupling location, an excitation laser for manipulating an electronic state or a nuclear state of the atom, a waveguide for guiding input light to the coupling location, and an output channel for directing quantum light generated at the coupling location, out of the vacuum chamber as a resource for quantum computing. The coupling location is associated with the PIC, and the interaction region of the PIC is arranged for at least partial exposure to the vacuum.