Spin Qubit Shuttling Path Selection for High-Fidelity Routing
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Solution Overview
Problem
The scalability of spin-qubit-based quantum computing is limited by the spatial requirements of wiring for control lines, which scale faster than the size of existing architectures, and high-fidelity shuttling is compromised by charge defects and low valley splitting in shuttling paths, affecting qubit reliability.
Innovation Solution
A method for operating a quantum processor using a semiconductor heterostructure with gate electrodes to create shuttling lanes, manipulation zones, and T-junctions, involving path selection and fidelity estimation to enhance qubit handling reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a two-dimensional architecture is used for spin qubit-based quantum computing, then the qubit arrangement is simplified, but the spatial requirements of wiring for control lines scale faster than the size of the quantum processor
Solution Approach 1:
The patent introduces a third dimension by stacking multiple quantum processor layers vertically, allowing control lines to route signals through the vertical dimension rather than expanding horizontally. This multi-layer architecture with through-silicon vias enables qubit scaling without proportional increases in wiring area, as control lines can pass through intermediate layers to reach target qubits.
2Object-affected harmful factors
If shuttling paths are used to transport qubits across arbitrary distances, then components can be arranged at a distance to lower crosstalk, but high-fidelity shuttling is compromised by charge defects and low valley splitting
Solution Approach 1:
The patent implements preliminary characterization of shuttling paths to identify locations with high charge noise and low valley splitting before qubit transport operations. By pre-mapping the quantum processor chip to determine reliable shuttling paths, the system can route qubits through regions with favorable properties, avoiding problematic areas that would compromise shuttling fidelity.
Solution Approach 2:
The system uses measured shuttling fidelity data from preliminary characterizations to dynamically select and adjust shuttling paths. By incorporating feedback from fidelity measurements, the control system can adapt routing decisions to maintain high-fidelity transport despite variations in device properties across the chip.
3Reliability
If the quantum processor is characterized to identify spots with reduced reliability, then qubit handling reliability can be improved, but the characterization process adds complexity
Solution Approach 1:
The patent performs comprehensive preliminary characterization of the quantum processor chip, including mapping valley splitting, charge noise, and shuttling fidelity across all potential transport paths. This upfront characterization creates a database of device properties that can be queried during operation, eliminating the need for repeated measurements and simplifying real-time control decisions.
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
Improves qubit handling reliability by selecting paths with high fidelity, ensuring accurate qubit operations and enhancing the performance of quantum processors.
Implementation Method 1
a plurality of gate electrodes (50) arranged on the semiconductor heterostructure (12) to provide a plurality of shuttling lanes (16) for moving a plurality of qubits along a plurality of paths (45)
Data Source
AI summary
A method, using a microprocessor, of operating a quantum chip comprised of a semiconductor heterostructure and a plurality of gate electrodes arranged on the semiconductor heterostructure to form a plurality of manipulation zones and a plurality of T-junctions to provide a plurality of shuttling lanes for moving a plurality of qubits along a plurality of paths. The manipulation zones comprises an interface where two shuttling lanes meet one another, and the plurality of T-junctions comprise junctions where a shuttling lane joins another shuttling lanes. The method comprises selecting a path along selected ones of the plurality of shuttling lanes between a start location and a finishing location; estimating a fidelity relating to shuttling a qubit along the path based on a predetermined shuttling fidelity relating to at least one of the selected ones of the plurality of shuttling lanes.