Micro-Fabricated Ion Trap with Stacked Substrates
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Solution Overview
Problem
Scaling up trapped ion devices for quantum computing poses challenges due to the need for a large number of trap electrodes with micrometer-scale manufacturing tolerances, while maintaining mechanical stability and efficient coupling of laser light, as the device size increases, requiring innovative solutions for controlling and protecting a large number of ions.
Innovation Solution
A micro-fabricated device with a multi-layer metal interconnect and micro-fabricated electrode structures on semiconductor or dielectric substrates, using spacer members for ion trapping between substrates, allowing for precise control and scalability, and incorporating optical access for laser interaction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the number of ions is increased to scale up quantum computing, then the computational power is improved, but the device area and complexity increase significantly
Solution Approach 1:
The device is divided into multiple identical modular units, each containing a defined number of ion traps and associated control electrodes. These modules can be replicated and arranged in arrays to scale computational capacity while maintaining manageable complexity through standardized design blocks.
Solution Approach 2:
The patent transitions from planar 2D electrode arrangements to three-dimensional ion trap configurations using stacked substrates with vertical spacing. This 3D architecture increases ion density and trap capacity without proportionally increasing the device footprint, effectively utilizing the vertical dimension for scaling.
2Measurement precision
If the number of trap electrodes is increased to control more ions, then the control precision is improved, but the manufacturing tolerance requirements become more stringent
Solution Approach 1:
The electrode system is segmented into modular groups associated with each ion trap module. This segmentation allows for localized fabrication and assembly, reducing the cumulative tolerance accumulation that would occur in monolithic large-scale electrode structures.
Solution Approach 2:
The patent employs adjustable electrode geometries and spacing parameters that can be optimized during fabrication. By making key dimensions tunable within reasonable ranges, the system maintains control precision even with variations in manufacturing tolerances, reducing the stringency of required precision.
3Quantity of substance
If the device size is increased to accommodate more ions, then the ion capacity is improved, but the mechanical stability deteriorates
Solution Approach 1:
The device is constructed from multiple identical mechanical modules that can be replicated and assembled into larger arrays. Each module maintains its structural integrity independently, and the modular assembly approach preserves mechanical stability while scaling ion capacity through repetition of stable units.
Solution Approach 2:
The patent uses vertical stacking of substrates to create three-dimensional ion trap arrays. This approach increases ion capacity by utilizing the vertical dimension rather than expanding laterally, thereby maintaining a compact footprint and preserving mechanical stability despite increased ion capacity.
4Productivity
If the device is scaled up to increase ion number, then the quantum computing capability is improved, but the laser coupling and shielding requirements become more sophisticated
Solution Approach 1:
Laser coupling and shielding systems are segmented and integrated at the module level rather than requiring centralized complex systems for the entire device. Each ion trap module has its own localized laser access paths and shielding structures, simplifying the overall system architecture and reducing the sophistication required for large-scale laser coupling.
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 the control of a large number of ions with high precision and mechanical stability, facilitating the scalability of quantum computing devices while maintaining efficient ion trapping and optical accessibility, addressing the challenges of device size and complexity.
Implementation Method 1
trapped ions... by virtue of electromagnetic fields
Implementation Method 2
A plurality of spacer members is disposed between the first substrate and the second substrate
Data Source
AI summary
A device (100) for controlling trapped ions (180) includes a first semiconductor substrate (120) comprising a semiconductor and/or dielectric material. A first micro-fabricated electrode structure (125) is disposed at a main side of the first substrate (120). The device (100) further includes a second substrate (140) comprising a semiconductor and/or dielectric material. A second micro-fabricated electrode structure (145) is disposed at a main side of the second substrate (140) opposite the main side of the first substrate (120). A plurality of spacer members (160) is disposed between the first substrate (120) and the second substrate (140). At least one ion trap is configured to trap ions (180) in a space between the first substrate (120) and the second substrate (140). The first micro-fabricated electrode structure (125) and the second micro-fabricated electrode structure (145) comprise electrodes of the ion trap. A multi-layer metal interconnect (135) is formed on the first substrate (120) and electrically connected to the first micro-fabricated electrode structure (125).