Ion Trap Semiconductor Substrate with Drift Region
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Solution Overview
Problem
Trapped ions in ion traps for quantum computing face challenges due to uncontrolled stray fields and electrical noise caused by photoionization, leading to increased micro-motion and heating, which complicates low-error-rate quantum operations.
Innovation Solution
A semiconductor substrate with a doped region and an insulating layer is used to create an ion trap device, where the doped region is biased by an external potential to eliminate stray charges, and a drift region is employed to reduce capacitance and further stabilize the ions, ensuring effective shielding and reduced noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If photoionization is used to address ions with lasers, then cooling and state preparation can be achieved, but uncontrolled stray fields and electrical noise are generated
Solution Approach 1:
A semiconductor substrate with a drift region is introduced as an intermediary between the ion trap electrodes and the underlying structure. The drift region, biased by external potentials, acts as a mediator that guides and controls charge carriers to compensate for photoionization charges without generating uncontrolled stray fields, thus enabling laser cooling while suppressing harmful electrical noise
Solution Approach 2:
The patent applies parameter changes by biasing the drift region with controlled external potentials (first and second potentials) to dynamically adjust the electric field distribution. This allows precise control over charge carrier movement to counteract photoionization effects while maintaining stable trapping conditions for the ions
2Quantity of substance
If stray fields are present from photoionization, then electrical charges are generated in the substrate, but this pushes trapped ions out of the potential minimum and increases micro-motion
Solution Approach 1:
The drift region creates a feedback mechanism where externally controlled potentials generate electric fields that respond to and counteract the stray fields from photoionization. This active feedback system continuously compensates for charge accumulation, keeping ions stable in the potential minimum and reducing micro-motion heating
Solution Approach 2:
By adjusting the external potentials applied to the drift region, the electric field parameters are changed to match and counterbalance the stray fields. This dynamic parameter adjustment ensures optimal charge compensation and maintains ion position stability under varying operational conditions
3Ease of manufacture
If conventional substrate structures are used, then manufacturing is simple, but capacitance is high and ion stability is reduced
Solution Approach 1:
The patent applies local quality by creating a drift region with specific doping characteristics in a localized area of the semiconductor substrate. This region has tailored electrical properties (controlled doping concentration and geometry) that reduce capacitance and improve ion stability, while the rest of the substrate maintains standard manufacturing simplicity
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
The solution effectively reduces micro-motion and heating of trapped ions, enhancing the stability and accuracy of quantum operations by eliminating stray fields and electrical noise, thereby improving the performance of ion traps for quantum computing.
Implementation Method 1
The substrate includes a drift region adjacent the first main surface. An RF electrode of an ion trap is disposed over the drift region... The drift region being disposed between and electrically connected to the first contact region and the second contact region
Implementation Method 2
An insulating layer is disposed between the electrode and the doped region
Implementation Method 3
The ions may be addressed by lasers for cooling, state preparation and other purposes. Photoionization may generate electrical charges in and/or on the substrate
Implementation Method 4
Ions can be trapped in an alternating electromagnetic field generated by an RF (radio frequency) voltage applied to surface electrodes of micro-fabricated ion traps
Data Source
AI summary
A device for controlling trapped ions includes a semiconductor substrate. The semiconductor substrate includes a first main surface and a second main surface opposite the first main surface. The substrate further includes a doped region adjacent the first main surface. An electrode of an ion trap is disposed over the doped region. An insulating layer is disposed between the electrode and the doped region. A contact region configured to be biased by an external potential is electrically connected to the doped region and has a doping concentration higher than a doping concentration of the doped region.