Compact RF Driver for Paul Traps in Quantum Computers

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Solution Overview

Problem

Existing RF driving methods for Paul traps in quantum computing are hindered by bulky, mechanically unstable helical resonators that are incompatible with cryogenic operations and require impedance matching, leading to inefficiencies and thermal noise.

Innovation Solution

A compact RF driving circuit using a low-output-impedance amplifier and LC tank circuit without impedance matching, employing superconducting materials for high-frequency operation at cryogenic temperatures, eliminating the need for tuning circuits and reducing thermal noise.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Power

If helical resonators are used to boost RF voltage, then RF voltage is amplified, but the device becomes bulky and mechanically unstable

Engineering Contradiction:

ImproveRF voltageVSAvoiddevice size and mechanical stability

Core Design Contradiction:

PowerVSDevice complexity

Solution Approach 1:

The patent removes the helical resonator component from the system entirely, replacing it with a direct connection between the RF amplifier and the ion trap electrodes. This extraction eliminates the bulk and mechanical instability issues while maintaining RF voltage generation through the amplifier's direct drive capability.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The RF amplifier is designed to perform multiple functions: it directly generates the required RF voltage without needing a separate resonator for voltage boosting, and it can operate across a range of frequencies. This multi-functionality consolidates the system into a more compact and stable configuration.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Power

If helical resonators are used for RF driving, then RF voltage is boosted, but compatibility with cryogenic operations is lost

Engineering Contradiction:

ImproveRF voltageVSAvoidcryogenic compatibility

Core Design Contradiction:

PowerVSAdaptability or versatility

Solution Approach 1:

The helical resonator is removed from the system, eliminating the component that prevented cryogenic compatibility. The simplified direct-drive architecture using only the RF amplifier and trap electrodes allows the system to operate effectively at cryogenic temperatures.

Inventive Principle:

Principle #2Taking out (Extraction)

3Loss of energy

If impedance matching is implemented, then power transfer is optimized, but thermal noise and power dissipation increase

Engineering Contradiction:

Improvepower transfer efficiencyVSAvoidthermal noise and power dissipation

Core Design Contradiction:

Loss of energyVSObject-generated harmful factors

Solution Approach 1:

The patent deliberately operates in an impedance-mismatched condition, converting what would traditionally be considered a harmful inefficiency into a beneficial feature. The impedance mismatch prevents thermal noise and power dissipation associated with traditional matching networks, while the system still achieves effective power transfer through the amplifier's direct drive capability and the ion trap's natural impedance characteristics.

Inventive Principle:

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

4Speed

If tank circuits with impedance matched amplifiers are used, then frequency control is achieved, but the system is limited to very low frequencies

Engineering Contradiction:

ImprovefrequencyVSAvoidfrequency range limitation

Core Design Contradiction:

SpeedVSProductivity

Solution Approach 1:

The patent changes the operating parameters by eliminating the traditional impedance-matched tank circuit configuration. The RF amplifier is designed to operate directly at higher frequencies (5-1000 MHz) without relying on resonant circuits, allowing the system to achieve both frequency control and extended frequency range capability.

Inventive Principle:

Principle #35Parameter changes

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 stable, high-frequency operation compatible with cryogenic conditions, reducing thermal noise and power dissipation, and enabling efficient ion trapping in quantum computing applications.

Implementation Method 1

employing superconducting materials compatible with necessary cryogenic temperatures and vacuum techniques while providing high current operation at sufficiently high frequencies, less thermal noise, and less intrinsic heating

Methodology Applied

Scientific EffectSuperconductivity: Superconductivity

Implementation Method 2

Methodology Applied

Scientific EffectElectrical resonance: Resonance

Implementation Method 3

a Paul trap is a type of quadrupole ion trap that uses static direct current (DC) and RF oscillating electric fields to trap ions

Methodology Applied

Scientific EffectElectrostatic force: Electrostatics

Implementation Method 4

a Paul trap is a type of quadrupole ion trap that uses static direct current (DC) and RF oscillating electric fields to trap ions

Methodology Applied

Scientific EffectLorentz force: Lorentz Force

Data Source

PatentUS10496932B2Compact RF driver for Paul traps used in quantum computers and methods of making and using same

Publication Date: 2019.12.03 DUKE UNIV

AI summary

Aspects of the present disclosure describe a compact RF driver circuit for Paul traps in trapped ion quantum computers and methods, and structures including same.