Segmented Ion Trap Electrodes for RF-DC Alignment Control
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Solution Overview
Problem
Ion traps face challenges in maintaining a well-controlled environment due to stray fields from electrical components, which misalign the RF-null point with the electrostatic or DC trapping point, requiring precise handling and numerous digital-to-analog converters (DACs) to compensate for these variations.
Innovation Solution
A system with a multidimensional array of electrodes, using a limited number of DACs to control multiple electrode segments, employs compensation fields and incremental shifting of confinement fields to align the RF and DC trapping points, reducing stray fields and improving precision through variable voltage compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If numerous digital-to-analog converters (DACs) are used to compensate for stray fields and misalignment between RF-null point and DC trapping point, then measurement precision and control accuracy improve, but device complexity increases
Solution Approach 1:
The patent segments the electrode structure into multiple zones along the ion trap axis, with each zone having independently controllable voltage. This segmentation allows precise control of the DC electric field distribution to align the DC trapping point with the RF-null point, reducing the need for numerous DACs while maintaining measurement precision.
Solution Approach 2:
The patent applies different voltage characteristics to different regions of the electrode structure. Specifically, certain electrode regions are designed with fixed voltages while others have variable voltages, creating local quality variations that enable precise trapping point alignment without requiring full control over all electrodes, thus reducing DAC complexity.
2Reliability
If numerous DACs are used to compensate for stray fields from electrical components, then reliability of ion trapping improves, but device complexity increases
Solution Approach 1:
By segmenting the electrode structure into zones with independent voltage control, the system can reliably compensate for stray fields in each region without requiring a DAC for every electrode. This segmentation maintains trapping reliability while reducing overall device complexity.
Solution Approach 2:
The patent introduces compensation electrodes as intermediary elements that generate compensating electric fields to counteract stray fields from other electrical components. These compensation electrodes are controlled by a limited number of DACs, enabling reliable stray field compensation without proportionally increasing DAC count.
3Manufacturing precision
If the width of DC electrodes is reduced to improve precision of ion handling, then manufacturing precision requirements increase
Solution Approach 1:
The patent segments the electrode structure and uses the spacing and positioning of multiple segmented electrodes to define the trapping region. This segmentation approach allows the system to achieve precise ion position control through the collective geometry of multiple electrodes rather than relying on the width of a single electrode, thereby reducing manufacturing precision requirements for individual electrode widths.
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 allows for precise control of ion movement with reduced components, minimizing DACs and stray fields, enhancing the stability and efficiency of ion handling in ion traps.
Implementation Method 1
at least one radio frequency (RF) electrode extending along a first direction, the at least one RF electrode configured to generate an RF field
Implementation Method 2
a plurality of direct current (DC) electrodes that are spaced apart along at least the first direction, the plurality of DC electrodes configured to generate an electric field
Data Source
AI summary
A system is provided that includes: at least one radio frequency (RF) electrode extending along a first direction, the at least one RF electrode configured to generate an RF field, where a first RF electrode of the least one RF electrode is disposed in a substrate, and a plurality of direct current (DC) electrodes that are spaced apart along at least the first direction, the plurality of DC electrodes configured to generate an electric field, where the RF field and the electric field are configured to trap an ion at a first position, the first position being spaced apart from the substrate by a first distance, where each DC electrode of the plurality of DC electrodes has a respective width in the first direction that is less or equal to 0.2 times the first distance.