Back-Thinned Ion-Trap Electrode Structures for Low Capacitance
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Solution Overview
Problem
Existing ion traps for quantum computers face issues with high parasitic capacitances due to semiconductor materials like silicon, which shorten coherence times of qubits and complicate manufacturing processes.
Innovation Solution
A method involving a base substrate with a semiconductor layer accessible through standard semiconductor manufacturing processes, followed by back-thinning to remove the semiconductor layer and bonding to an insulating substrate, reducing parasitic capacitances and enabling precise, scalable electrode structures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If semiconductor materials like silicon are used in ion traps, then manufacturing processes become controllable and scalable using standardized semiconductor manufacturing processes, but parasitic capacitances increase which shortens coherence times of qubits
Solution Approach 1:
The substrate is divided into two functional layers: a semiconductor base substrate for manufacturing and an insulating substrate for operation. The semiconductor layer is segmented from the final operational structure through back-thinning, allowing manufacturing benefits to be separated from operational drawbacks.
Solution Approach 2:
The harmful semiconductor material is extracted from the final structure by removing the base substrate after bonding to the insulating substrate. This eliminates parasitic capacitances while retaining the manufacturing advantages of semiconductor processes.
Solution Approach 3:
The insulating substrate acts as an intermediary carrier that receives the metallization arrangement from the semiconductor base substrate. It provides mechanical stability during processing while being electrically inert, thus mediating between manufacturing requirements and operational performance.
2Reliability
If back-thinning is performed to remove the semiconductor layer, then parasitic capacitances are reduced improving coherence times, but mechanical stability during processing becomes compromised
Solution Approach 1:
The insulating substrate is bonded to the semiconductor base substrate before back-thinning is performed. This preliminary bonding provides the mechanical support needed to safely remove the semiconductor layer without compromising structural integrity.
Solution Approach 2:
The insulating substrate serves as a mechanical intermediary that supports the delicate metallization arrangement during back-thinning and subsequent processing. It carries the structure through vulnerable stages while being electrically isolated.
3Manufacturing precision
If standard semiconductor manufacturing processes are used, then manufacturing precision and scalability are improved, but device complexity increases due to additional layers and processing steps
Solution Approach 1:
The device is segmented into a manufacturing stage using complex semiconductor processes and an operational stage using simple insulating substrates. This allows high precision manufacturing to be decoupled from operational simplicity.
Solution Approach 2:
The complex semiconductor base substrate is discarded after its manufacturing function is fulfilled. Its value is recovered in the form of a precisely fabricated metallization arrangement that is transferred to the simple insulating substrate.
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 improves coherence times of qubits and allows for better control of ion positions in three-dimensional space, facilitating more complex quantum computing applications with higher precision and cost-effectiveness.
Implementation Method 1
bonding a base substrate to an insulating substrate
Data Source
Figure 1
Figure 2a~2b
Figure 3a~3c
AI summary
A method (100) for producing an electrode structure (206) for an ion trap, comprising the following steps: providing (110) a base substrate (202) having a structured metallization arrangement (230) arranged in an insulating material (220) on a semiconductor layer (210); providing (120) an insulating substrate (250) having a dielectric material (252); bonding (130) a surface region (224) of the base substrate (202) arranged on the insulating material (220) to the insulating substrate (250) by means of a bonding process; and thinning (140) the base substrate (202) by removing the semiconductor layer (210) down to the insulating material (220) of the base substrate (202), wherein the electrode structure (206) is provided for the ion trap is formed by carrying out the step of back thinning to the metallization arrangement (230),or by applying a structured surface metallization (240) to the insulating material (220) of the re-thinned base substrate (202) or wherein the electrode structure (206) for the ion trap is formed by the structured metallization arrangement (230).