Integrated Waveguide Ion Trap for Vibration-Resistant Quantum Control

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Solution Overview

Problem

The scaling of ion-based quantum devices is hindered by the space requirements and susceptibility to drifts and vibrations of free beam optics used for initializing, manipulating, and detecting trapped ions, which becomes exacerbated with increasing numbers of ions needed for efficient error-correction in quantum computing.

Innovation Solution

A micro-fabricated device with a structured metal layer and integrated short-pulse-laser direct written waveguides that direct laser light towards trapped ions, reducing space requirements and minimizing interference from mechanical influences by fixing the dielectric element to the substrate.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If free beam optics are used to initialize, manipulate and detect trapped ions, then the system can control quantum information encoded in trapped ions, but the system becomes susceptible to drifts and vibrations between optical elements and ions

Engineering Contradiction:

Improvecontrol stabilityVSAvoidsusceptibility to drifts and vibrations

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent integrates the waveguide structure directly with the ion trap device, merging the optical delivery system with the ion confinement structure. This integration eliminates the need for separate free-space optical paths, thereby reducing susceptibility to drifts and vibrations while maintaining reliable quantum information control.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent introduces waveguides as an intermediary structure to deliver laser light to trapped ions. These waveguides act as a stable mediator that guides optical signals from external sources to the ions without requiring free-space propagation, thereby eliminating drift and vibration issues associated with traditional free beam optics.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Adaptability or versatility

If a plurality of lasers are focused on trapped ions from different directions using free beam optics, then quantum information can be manipulated, but space issues arise due to the required separation between optical elements and ions

Engineering Contradiction:

Improvelaser manipulation capabilityVSAvoidspace requirement

Core Design Contradiction:

Adaptability or versatilityVSArea of stationary object

Solution Approach 1:

The patent transitions from three-dimensional free-space optical manipulation to two-dimensional planar waveguide integration. By confining light propagation to the waveguide plane and using vertical coupling to deliver light to ions, the system achieves versatile laser manipulation from multiple directions while minimizing the horizontal space footprint.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Solution Approach 2:

The patent embeds waveguide structures within or adjacent to the ion trap electrodes, nesting the optical delivery system within the existing device footprint. This allows multiple lasers to be delivered from different directions through vertically stacked or laterally integrated waveguides without requiring additional horizontal space.

Inventive Principle:

Principle #7Nested doll (Nesting)

3Quantity of substance

If the number of trapped ions is increased to 10000 ions for scalable quantum computing, then the computational power increases, but the total required area increases to 100 cm2 to 1 m2

Engineering Contradiction:

Improvenumber of ionsVSAvoiddevice area

Core Design Contradiction:

Quantity of substanceVSArea of stationary object

Solution Approach 1:

The patent replaces traditional free-space optical manipulation with integrated waveguide-based optical delivery. This substitution enables dense packing of ion trapping zones because waveguides can be routed in two dimensions within the device plane, allowing thousands of ions to be confined in a compact area without requiring proportionally increasing space for optical access.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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 efficient control and measurement of a larger number of trapped ions with reduced susceptibility to vibrations and space constraints, facilitating the advancement of quantum computing by allowing for more ions and improved error-correction.

Implementation Method 1

at least one short-pulse-laser direct written waveguide configured to direct laser light towards an ion trapped in the at least one ion trapping zone

Methodology Applied

Scientific EffectTotal internal reflection: Total Internal Reflection

Implementation Method 2

electrodes of at least one ion trapping zone configured to trap an ion in a space above the structured first metal layer

Methodology Applied

Scientific EffectElectromagnetic field: Electromagnetic Induction

Data Source

PatentUS20240127981A1Device for controlling trapped ions with integrated waveguide

Publication Date: 2024.04.18 INFINEON TECH AUSTRIA AG

AI summary

A micro-fabricated device for controlling trapped ions includes a first substrate having a main surface. A structured first metal layer is disposed over the main surface of the first substrate. The structured first metal layer includes electrodes of at least one ion trapping zone configured to trap an ion in a space above the structured first metal layer. A dielectric element is fixedly attached to the first substrate. The dielectric element includes at least one short-pulse-laser direct written (SPLDW) waveguide configured to direct laser light towards an ion trapped in the at least one ion trapping zone.