Ion Trap Electrode Routing for Low Magnetic Field Noise
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Solution Overview
Problem
Existing ion trap devices experience significant magnetic field noise due to the layout of signal and return lines, which affects the precise control of ion movement and state in quantum computing environments.
Innovation Solution
The electrode arrangements in the ion trap device are designed with signal and return line portions running in close proximity to each other, with the return line width no greater than 10 times the signal line width, and opposite current directions to minimize magnetic field interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If signal and return lines are routed separately with conventional layout, then ease of manufacture is improved, but magnetic field noise increases
Solution Approach 1:
The signal line and return line are merged into a differential pair configuration where they run parallel and adjacent to each other throughout the substrate. This merging allows the magnetic fields generated by the two lines to cancel each other out, significantly reducing magnetic field noise while maintaining ease of manufacture through standard PCB differential pair routing techniques
Solution Approach 2:
The invention converts the potentially harmful magnetic field interference into a beneficial effect by deliberately routing the signal and return lines in close proximity with opposite current directions. The magnetic fields that would normally be harmful are now made to cancel each other, transforming the problem of magnetic interference into a solution that actively reduces noise
2Reliability
If return line width is increased to reduce impedance, then electrical stability is improved, but magnetic field interference increases
Solution Approach 1:
The invention optimizes the width parameters of both signal and return lines within specific ranges (signal line: 2-10 mils, return line: 4-20 mils) to achieve the desired impedance matching while minimizing magnetic field interference. By carefully adjusting these dimensional parameters, the design achieves electrical stability without excessive line widths that would generate harmful magnetic fields
Solution Approach 2:
The return line is designed with non-uniform width along its length, with wider sections positioned away from sensitive trapped ion regions and narrower sections closer to the ions. This local variation in width allows the return line to provide adequate current return path for electrical stability while minimizing magnetic field exposure in critical areas
3Area of stationary object
If signal lines are routed closer to trapped ions for compact design, then device area is reduced, but magnetic field noise increases
Solution Approach 1:
By merging the signal and return lines into a tight differential pair configuration, the invention achieves compact routing that can be placed close to trapped ions without significantly increasing magnetic field noise. The differential configuration ensures that magnetic fields cancel even at close distances, enabling compact device design while maintaining low noise levels
Solution Approach 2:
The invention utilizes the vertical dimension by routing signal and return lines on adjacent layers of the PCB substrate, separated by a controlled dielectric thickness. This three-dimensional arrangement allows compact positioning near trapped ions while maintaining adequate separation between the lines themselves, reducing magnetic field interference through spatial distribution in multiple dimensions
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 design significantly reduces magnetic field noise around trapped ions, enhancing the precision and control of ion movement and state in quantum computing operations.
Implementation Method 1
electrodes are controlled to provide an intended electromagnetic field (EM-field)... accurate control of the E-fields created by the electrodes... reduce any noise or other undesired fluctuations of the EM-field experienced by the ion(s), particularly the magnetic component
Implementation Method 2
a capacitance arrangement connected between the electrode and the return line portion
Data Source
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Figure 5
AI summary
An ion trap device in which a return line portion (230) and one or more signal line portions (220) , for driving an electrode (210) of the ion trap device, are configured to run alongside one another in close proximity for a majority of the length of the return line portion.