Ion Trap Microwave Rails With Stacked Trench Capacitors
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Solution Overview
Problem
Existing ion trap designs face challenges in providing sufficient microwave fields near ions due to space constraints from on-chip filter capacitors and other components, which hinders efficient trapping and quantum state transitions.
Innovation Solution
The design incorporates microwave and radio frequency rails with parallel longitudinal axes and coplanar upper surfaces, along with through-silicon vias and trench capacitors, to create a planarized topology that allows for efficient microwave field distribution and ion trapping, while minimizing the impact of on-chip components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If on-chip filter capacitors and other components are used in traditional ion trap designs, then the ion trap can be constructed with standard components, but the microwave field strength near the ions is insufficient and on-chip space is occupied
Solution Approach 1:
The patent transitions from planar on-chip capacitors to three-dimensional stacked capacitor structures. The stacked capacitors extend vertically above the substrate surface, utilizing the third dimension to achieve the required capacitance values without occupying additional lateral chip area. This dimensional transition allows sufficient microwave field strength while preserving on-chip space.
Solution Approach 2:
The stacked capacitor structure nests multiple capacitor elements vertically one above another. Each capacitor layer is positioned directly over the previous layer, creating a compact nested arrangement that maximizes capacitance density in the vertical direction while minimizing lateral footprint on the chip.
2Reliability
If on-chip filter capacitors are placed near the ion trap region, then filtering can be performed, but visualization and imaging of trapped ions are affected
Solution Approach 1:
The filter capacitors are repositioned from the lateral plane to the vertical dimension through stacked construction. This elevation removes the capacitors from the ion trap region's lateral footprint, eliminating their obstruction to optical paths used for ion visualization while maintaining their filtering function in the vertical stack structure.
Solution Approach 2:
The patent introduces transparent or optically compatible materials in the stacked capacitor structure to mediate between the electrical filtering function and optical transparency requirements. These intermediary materials allow microwave field filtering while permitting laser beams to pass through for ion imaging without significant attenuation.
3Productivity
If traditional ion trap designs are used, then construction is straightforward, but efficient microwave field distribution for quantum state transitions cannot be achieved
Solution Approach 1:
The stacked capacitor architecture extends the field distribution capability into the vertical dimension, creating enhanced microwave field penetration and uniformity through the ion trap region. This three-dimensional field distribution improves quantum state transition efficiency by ensuring consistent coupling across the trapped ion ensemble.
Solution Approach 2:
The patent merges multiple capacitor layers with shared electrodes and common connections into a unified stacked structure. This consolidation achieves the complex field distribution requirements through an integrated design that, while vertically complex, can be fabricated using standard layered semiconductor processing techniques.
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 configuration enhances the efficiency of ion trapping and quantum state transitions by ensuring strong and controlled microwave fields, even in space-constrained environments, thereby improving the overall performance of the ion trap system.
Implementation Method 1
An ion trap can use a combination of electrical and magnetic fields to capture one or more ions in a potential well
Implementation Method 2
An ion trap can use a combination of electrical and magnetic fields to capture one or more ions in a potential well
Implementation Method 3
An ion trap can use a combination of electrical and magnetic fields to capture one or more ions in a potential well
Implementation Method 4
The design incorporates microwave and radio frequency rails with parallel longitudinal axes and coplanar upper surfaces
Data Source
AI summary
Apparatuses, systems, and methods for ion traps are described herein. One apparatus includes a number of microwave (MW) rails and a number of radio frequency (RF) rails formed with substantially parallel longitudinal axes and with substantially coplanar upper surfaces. The apparatus includes two sequences of direct current (DC) electrodes with each sequence formed to extend substantially parallel to the substantially parallel longitudinal axes of the MW rails and the RF rails. The apparatus further includes a number of through-silicon vias (TSVs) formed through a substrate of the ion trap and a trench capacitor formed in the substrate around at least one TSV.