Coupled Qubit Resonator Gate Control Using Adiabatic Sweeps

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Solution Overview

Problem

Current quantum computing technologies face challenges in accurately controlling quantum gates without requiring high precision electronic controls, leading to increased complexity and cost.

Innovation Solution

The method involves using a classical control parameter associated with a qubit coupled to a resonator, transitioning through adiabatic sweeps and jumps to manipulate quantum states, allowing for accurate quantum gate operations without the need for high precision control.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If high precision electronic controls are used to accurately control quantum gates, then quantum gate operation accuracy is improved, but device complexity and cost increase

Engineering Contradiction:

Improvequantum gate operation accuracyVSAvoidcontrol system complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent replaces complex electronic control systems with a mechanically simple resonant cavity system. Quantum gates are controlled by adjusting the resonant frequency of the cavity to match the energy difference between qubit states, eliminating the need for high-precision electronic control circuits while maintaining gate operation accuracy.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The invention changes the control parameter from electronic voltage/current signals to resonant frequency tuning. By adjusting the resonant frequency of the cavity (a physical parameter that can be controlled with simple mechanical or electrical tuning elements), the system achieves precise quantum gate control without requiring complex electronic control infrastructure.

Inventive Principle:

Principle #35Parameter changes

2Measurement precision

If high precision electronic controls are used to accurately control quantum gates, then quantum gate operation accuracy is improved, but cost increases

Engineering Contradiction:

Improvequantum gate operation accuracyVSAvoidmanufacturing cost

Core Design Contradiction:

Measurement precisionVSEase of manufacture

Solution Approach 1:

The patent replaces expensive high-precision electronic control systems with a simple resonant cavity mechanism. The control is achieved through frequency tuning of the cavity, which can be implemented with basic electronic components (inductors, capacitors) or mechanical tuning elements, dramatically reducing manufacturing costs while maintaining gate accuracy.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The resonant cavity system is self-regulating through natural resonance phenomena. When the cavity frequency matches the qubit energy difference, energy exchange occurs automatically without requiring complex external control circuits, reducing both manufacturing cost and operational complexity.

Inventive Principle:

Principle #25Self-service

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 reduces the complexity and cost of quantum computing by enabling accurate control of quantum gates using digital control methods, allowing for efficient manipulation of quantum states and operations.

Implementation Method 1

The first control parameter is transitioned from a first control value to a second control value via an adiabatic sweep operation to permit a transfer of energy between the first qubit and the resonator that causes a change in the quantum state of the qubit and resonator

Methodology Applied

Scientific EffectAdiabatic sweep:

Implementation Method 2

The first control parameter is transitioned from the second control value to a third control value via a jump operation as to maintain the quantum state of the qubit and resonator

Methodology Applied

Scientific EffectQuantum jump:

Implementation Method 3

The first classical control parameter is adiabatically swept from a first control value to a second control value, such that the coupled first qubit and resonator enter a quantum state associated with a first energy state of a crossing of the first energy state and a second energy state

Methodology Applied

Scientific EffectAvoided crossing:

Data Source

PatentUS7893708B2Quantum gate operations with a common coupled resonator

Publication Date: 2011.02.22 NORTHROP GRUMMAN SYSTEMS CORP

AI summary

Systems and methods are provided for performing a quantum gate operation. A first classical control parameter is associated with a first qubit and coupled to a resonator. The first classical control parameter is transitioned from a first control value to a second control value. The first classical control parameter is returned from the second control value to the first control value via an adiabatic sweep operation, as to permit a transfer of energy between the first qubit and the resonator that causes a change in the quantum state of the qubit and resonator.