Tunable Superinductor Coupler for Noise-Robust Remote Entanglement

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Solution Overview

Problem

Conventional methods for remote entanglement of quantum devices using superconducting cavity resonators face challenges in achieving sufficient quality factor, tunable resonant frequency, and are susceptible to environmental noise, leading to decoherence and operational failures.

Innovation Solution

A method involving a tunable superinductor, composed of Josephson junctions and a superconducting quantum interference device (SQUID), is used to inductively couple currents between AC dipoles, enabling high-precision, tunable, and electrically-protected remote entanglement.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If superconducting cavity resonators are used for remote entanglement, then entanglement operations can be achieved, but the quality factor is insufficient and fabrication is challenging

Engineering Contradiction:

Improveentanglement operation qualityVSAvoidresonator fabrication quality factor

Core Design Contradiction:

ReliabilityVSManufacturing precision

Solution Approach 1:

The patent transforms the resonator from a fixed-frequency cavity resonator to a tunable frequency converter using Josephson junctions. By changing the operating parameters (frequency, inductance) dynamically, the system achieves high-quality entanglement operations without requiring extremely precise fixed fabrication tolerances of traditional resonators.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The invention introduces dynamic tunability to the resonator system through Josephson junctions, allowing the resonant frequency and coupling characteristics to be adjusted in real-time. This dynamic capability enables the system to adapt to different operating conditions and maintain high entanglement quality without requiring perfect static fabrication.

Inventive Principle:

Principle #15Dynamics

2Adaptability or versatility

If conventional resonators are used, then remote entanglement can be achieved, but resonant frequency tuning is inaccurate

Engineering Contradiction:

Improveresonant frequency tuning capabilityVSAvoidresonant frequency accuracy

Core Design Contradiction:

Adaptability or versatilityVSMeasurement precision

Solution Approach 1:

The patent employs Josephson junctions to enable precise, dynamic control of the resonant frequency. By adjusting the bias current through the Josephson junction, the inductance and thus the resonant frequency can be tuned accurately over a wide range, solving the frequency tuning inaccuracy problem of conventional resonators.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The invention replaces the mechanical/physical fixed-structure resonator with a quantum-based Josephson junction system that uses quantum tunneling effects to achieve frequency control. This substitution enables precise electronic tuning rather than relying on fixed geometric dimensions.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Reliability

If superconducting cavity resonators are used, then entanglement operations can proceed, but environmental noise causes decoherence and operational failure

Engineering Contradiction:

Improveoperational stabilityVSAvoidenvironmental noise susceptibility

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent uses the Josephson junction's nonlinear inductance特性 to create a dynamically tunable system that can adapt to and compensate for environmental noise. By continuously adjusting the operating parameters, the system can maintain optimal coupling and frequency matching despite external perturbations, converting the vulnerability to noise into an opportunity for active noise compensation.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Solution Approach 2:

The invention implements a feedback mechanism through the tunable Josephson junction resonator, where the system can detect frequency shifts and coupling changes caused by environmental noise and actively adjust its parameters to maintain stable entanglement operations. This closed-loop control compensates for decoherence effects.

Inventive Principle:

Principle #23Feedback

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

The solution provides superior tunability, isolation, and robustness against noise, enhancing quantum sensing technologies and improving fabrication uniformity.

Implementation Method 1

inductively coupling a current from a first AC dipole into the tunable superinductor, and inductively coupling an induced current from the tunable superinductor into a second AC dipole

Methodology Applied

Scientific EffectElectromagnetic induction: Electromagnetic Induction

Implementation Method 2

The inductance of the superinductor may be tuned by controlling an amount of bias current of the DC current source

Methodology Applied

Scientific EffectSuperconducting quantum interference: Josephson Effect

Data Source

PatentUS12573532B2Superinductor-based remote entanglement coupler

Publication Date: 2026.03.10 THE BOEING CO

AI summary

The present disclosure provides a method of remote entanglement of alternating current (AC) dipoles in one aspect, the method including: supplying a bias current to a tunable superinductor, inductively coupling a current from a first AC dipole into the tunable superinductor, and inductively coupling an induced current from the tunable superinductor into a second AC dipole.