Josephson Junction Frequency Trimming for Superconducting Qubits

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Solution Overview

Problem

Existing superconducting qubits exhibit variance in resonance frequency due to fabrication inconsistencies, leading to dispersion and performance degradation in quantum computers, necessitating improved frequency control methods without dynamic tuneability during operation.

Innovation Solution

Adjusting the frequency of superconducting qubits by heating and cooling Josephson junctions using an electron beam to alter resistance, allowing precise control of qubit frequencies before operation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If fabrication processes are used to create superconducting qubits, then qubits can be manufactured, but variance in fabrication leads to frequency dispersion and performance degradation

Engineering Contradiction:

Improvequbit frequency consistencyVSAvoidquantum computer performance

Core Design Contradiction:

Manufacturing precisionVSReliability

Solution Approach 1:

The patent applies preliminary action by adjusting the resonance frequency of each qubit before the quantum computer begins operation. Frequency adjustment is performed on fabricated qubits to correct deviations from target frequencies, ensuring all qubits operate at their designed frequencies before being put into service. This pre-adjustment eliminates frequency dispersion issues that would otherwise degrade quantum computer performance.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent implements parameter changes by modifying the resonance frequency parameter of qubits after fabrication. By changing the frequency parameter of individual qubits to match their target frequencies, the system compensates for fabrication variances. This parameter adjustment process transforms qubits from having dispersed frequencies to having consistent, specified frequencies, thereby improving manufacturing precision and reliability.

Inventive Principle:

Principle #35Parameter changes

2Ease of operation

If dynamically tuneable qubits are used to adjust frequency during operation, then frequency control is improved, but extra components and electromagnetic signals increase complexity and noise

Engineering Contradiction:

Improvefrequency controlVSAvoidqubit structure

Core Design Contradiction:

Ease of operationVSDevice complexity

Solution Approach 1:

The patent applies preliminary action by performing frequency adjustment during the fabrication or pre-operation phase rather than requiring dynamic tuning during quantum computation. The qubit frequency is set and optimized before the quantum computer begins operation, eliminating the need for additional dynamic tuning components during actual quantum processing. This approach provides frequency control without adding operational complexity.

Inventive Principle:

Principle #10Preliminary action

3Measurement precision

If frequency adjustment methods are applied to qubits, then frequency precision is improved, but the adjustment process must not affect neighboring qubits or reduce coherence times

Engineering Contradiction:

Improvequbit frequency precisionVSAvoidqubit coherence time

Core Design Contradiction:

Measurement precisionVSReliability

Solution Approach 1:

The patent applies local quality by implementing localized frequency adjustment methods that target specific qubits without affecting neighboring qubits. The adjustment process is applied locally to individual qubits or small groups, ensuring that frequency precision is improved for each qubit while maintaining the integrity and coherence of adjacent qubits. This localized approach prevents cross-interference that would otherwise reduce overall system reliability.

Inventive Principle:

Principle #3Local quality

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 method achieves precise and localized frequency adjustment of qubits without affecting neighboring qubits, maintaining high coherence times and reducing dispersion, thereby enhancing quantum computer performance.

Implementation Method 1

directing an electron beam to heat the Josephson junction

Methodology Applied

Scientific EffectJoule heating: Joule Heating

Implementation Method 2

A Josephson junction is a nonlinear inductive element, which in practice serves to create a distinct difference between energy levels in a superconducting qubit

Methodology Applied

Scientific EffectJosephson effect: Josephson Effect

Data Source

PatentUS20260017552A1Qubit adjustment

Publication Date: 2026.01.15 OXFORD QUANTUM CIRCUITS LTD

AI summary

A method of adjusting the frequency of a qubit comprising a Josephson junction. The method comprises directing an electron beam to heat the Josephson junction. The method further comprises cooling the Josephson junction following the heating of the Josephson junction by the electron beam. The heating and cooling of the Josephson junction serves to alter a resistance of the Josephson junction, and wherein the alteration of the resistance of the Josephson junction changes the frequency of the qubit.