Multi-qubit coupling via tunable superconducting capacitor

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Solution Overview

Problem

Existing multi-qubit coupling technologies face challenges in easily generating desired coupling constants for qubits, particularly due to the limitations of fixed capacitors which restrict the formation of desired multi-qubit states and are influenced by magnetic flux in inductive coupling.

Innovation Solution

A multi-qubit coupling structure incorporating a tunable superconducting capacitor with a variable dielectric intermediate layer, allowing for adjustment of coupling constants by applied voltage, enabling flexible implementation of multi-qubit circuits without magnetic flux interference.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a fixed capacitor is used for qubit coupling, then the coupling structure is simple, but the coupling constants cannot be tuned to desired values

Engineering Contradiction:

Improvetunability of coupling constantsVSAvoidcomplexity of coupling structure

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent employs a variable capacitor instead of a fixed capacitor to enable dynamic adjustment of coupling constants. The variable capacitor allows the coupling strength between qubits to be tuned by changing its capacitance value, thereby resolving the contradiction between adaptability and device complexity by introducing controlled variability into the coupling mechanism.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes the electrical parameter (capacitance) of the coupling element to enable tuning of coupling constants. By using a variable capacitor whose capacitance can be adjusted, the system achieves desired coupling constant values without requiring complete redesign of the coupling structure, thus balancing adaptability with manageable complexity.

Inventive Principle:

Principle #35Parameter changes

2Object-affected harmful factors

If inductive coupling is used between qubits, then coupling can be achieved, but the system is influenced by magnetic flux interference

Engineering Contradiction:

Improvemagnetic flux interferenceVSAvoidease of forming desired multi-qubit states

Core Design Contradiction:

Object-affected harmful factorsVSEase of operation

Solution Approach 1:

The patent replaces inductive coupling (which relies on magnetic flux) with capacitive coupling. By using electric field-based capacitive interaction between qubits instead of magnetic field-based inductive coupling, the system eliminates sensitivity to magnetic flux interference while maintaining the ability to form desired multi-qubit states, thus resolving the contradiction between reducing harmful factors and ease of operation.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Adaptability or versatility

If fixed coupling constants are used, then the circuit structure is stable, but desired multi-qubit states cannot be formed

Engineering Contradiction:

Improveability to form desired multi-qubit statesVSAvoidease of implementing multi-qubit circuits

Core Design Contradiction:

Adaptability or versatilityVSEase of manufacture

Solution Approach 1:

The patent introduces a variable capacitor that allows dynamic adjustment of coupling constants after manufacturing. This enables the system to form desired multi-qubit states by tuning coupling strengths without requiring complex manufacturing processes, as the tunability is achieved through electrical control rather than complex fabrication, thus resolving the contradiction between adaptability and ease of manufacture.

Inventive Principle:

Principle #15Dynamics

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

Enables easy tuning of coupling constants for qubits, facilitating the formation of desired multi-qubit states and circuits, enhancing the flexibility and efficiency of quantum information processing.

Implementation Method 1

a variable capacitor electrically connected to the plurality of qubits, wherein the variable capacitor is configured to vary coupling constants of the plurality of qubits

Methodology Applied

Scientific EffectCapacitance: Capacitance

Implementation Method 2

the intermediate layer has a dielectric constant which varies based on an applied voltage

Methodology Applied

Scientific EffectDielectric constant variation: Dielectric

Implementation Method 3

the intermediate layer is formed of at least one of ferroelectric materials and piezoelectric materials

Methodology Applied

Scientific EffectFerroelectric effect:

Implementation Method 4

the intermediate layer is formed of at least one of ferroelectric materials and piezoelectric materials

Methodology Applied

Scientific EffectPiezoelectric effect: Piezoelectric Effect

Implementation Method 5

The plurality of qubits are superconducting qubits formed by using superconducting materials

Methodology Applied

Scientific EffectSuperconductivity: Superconductivity

Data Source

PatentUS9633314B2Multi-qubit coupling structure

Publication Date: 2017.04.25 SAMSUNG ELECTRONICS CO LTD

AI summary

A quantum qubit coupling structure is provided. The quantum qubit coupling structure includes a plurality of qubits and a variable capacitor electrically connected between the plurality of qubits to vary coupling constants of the plurality of qubits.