Ion Trap Electrode Offset Circuits for Stray Field Compensation
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Solution Overview
Problem
In trapped ion quantum computing (TIQC) systems, precise control of electrostatic potentials is required to move ions between storage and processing locations, but existing methods face challenges in accurately controlling hundreds or thousands of electrodes simultaneously, leading to issues with stray electric fields that cause excess micromotion and increased heating rates of trapped ions.
Innovation Solution
The implementation of a system that includes digital-to-analog converters (DACs), a multiplexer, and direct current (DC) offset circuits, where the DC offset circuits are configured to add configurable DC offset voltages to the output voltages of the multiplexer or its amplified versions, allowing for precise compensation of stray electric fields and relaxation of the digital resolution requirements of the DACs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If high-resolution DACs are used to precisely control electrode potentials, then measurement precision and manufacturing precision improve, but device complexity and cost increase
Solution Approach 1:
The patent segments the voltage control function into two independent parts: a multiplexer that switches between multiple DAC outputs, and individual DC offset circuits for each electrode. This segmentation allows the use of lower-resolution DACs while maintaining overall precision through local offset compensation.
Solution Approach 2:
The patent introduces DC offset circuits as intermediary components between the multiplexer/DACs and the electrodes. These offset circuits add configurable DC voltages to compensate for stray electric fields, effectively mediating between the coarse DAC output and the precise electrode potential requirement.
2Manufacturing precision
If high-resolution DACs are used to accurately control hundreds or thousands of electrodes, then manufacturing precision improves, but use of energy increases
Solution Approach 1:
The patent divides the power consumption burden by using a multiplexer to share DAC resources across multiple electrodes. Instead of powering many high-resolution DACs simultaneously, the system uses fewer lower-resolution DACs with local offset circuits, reducing total energy consumption while maintaining precision.
Solution Approach 2:
The patent uses a single multiplexer to sequentially provide voltage signals to multiple electrodes, effectively copying the voltage control function across many electrodes without requiring proportionally more high-resolution DACs. This reduces the energy-intensive DAC operations while maintaining control precision through the offset compensation mechanism.
3Manufacturing precision
If individual DC offset voltages are added to each electrode, then manufacturing precision improves, but device complexity increases
Solution Approach 1:
The patent makes the DC offset circuits configurable and adaptable to different electrodes, allowing a standardized circuit design to serve multiple functions across the electrode array. This universality reduces overall system complexity by using repeated modular units rather than custom circuits for each electrode.
Solution Approach 2:
Each DC offset circuit is independently configurable to compensate for the specific stray electric fields at its associated electrode. This self-service approach allows local optimization without requiring complex centralized control, reducing the overall system complexity while improving precision.
4Productivity
If more DACs are used to control more electrodes, then productivity improves, but device complexity and cost increase
Solution Approach 1:
The patent merges multiple DAC outputs through a multiplexer that can rapidly switch between them, allowing a smaller number of DACs to effectively control a large number of electrodes. This merging reduces device complexity and cost while maintaining the productivity needed for rapid ion shuttling operations.
Solution Approach 2:
The patent introduces dynamic switching through the multiplexer, which rapidly changes connections between DACs and electrodes based on operational requirements. This dynamic approach enables efficient control of many electrodes with fewer DACs, supporting high-speed ion shuttling without proportionally increasing system complexity.
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 solution enables efficient control of ion movement in TIQC systems by reducing the number of high-resolution DACs required, thereby decreasing costs and power consumption while improving flexibility and precision in compensating stray electric fields.
Implementation Method 1
the DC offset circuits are configured to add configurable DC offset voltages to the output voltages of the multiplexer or its amplified versions
Implementation Method 2
converting, by the plurality of DACs, multiple digital voltage values to multiple analog voltages
Implementation Method 3
electrostatic potentials are used to move ions between storage and processing locations in a process called ion shuttling
Data Source
AI summary
A device includes a plurality of digital-to-analog converters (DACs), a multiplexer, a plurality of electrodes including a first electrode, and a plurality of direct current (DC) offset circuits including a first DC offset circuit. At least one of the plurality of electrodes is located along a lane for movement of an ion. The multiplexer has multiple inputs coupled to the plurality of DACs and multiple outputs including a first output. The first output is configured to provide a first voltage. The first DC offset circuit is coupled between the first output and the first electrode. The first DC offset circuit is configured to add a first DC offset voltage to either the first voltage or the first voltage amplified by a first gain. The first DC offset voltage is configurable.