Device for Manipulating Qubits for a Semiconductor Spin Qubit Quantum Computer

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This invention describes a specialized device, known as a "manipulation zone," for manipulating spin qubits in a semiconductor-based quantum computer. The device uses a series of gate electrodes (including finger gates and top gates), along with local magnets and applied voltages, to move qubits along intersecting paths on a semiconductor chip and to adjust or read out their quantum spin states. It enables precise control over single and two-qubit operations by electrically adjusting confinement potentials, resonance frequencies, and exchange interactions. The design is intended to address specific issues in scalable quantum computing architectures, such as wiring fan-out and fidelity loss due to material defects or environmental noise.

Use CasesContent extracted from patent full text and abstract with AI.

• Scalable quantum computing platforms using semiconductor spin qubits.
• High-fidelity quantum gate operations in quantum processors.
• Development and testing of fault-tolerant quantum logic elements.
• Implementing quantum algorithms with movable and manipulatable qubits.
• Enabling advanced quantum error correction methods through precise qubit control.
• Quantum hardware research and prototyping for industry and academia.

BenefitsContent extracted from patent full text and abstract with AI.

• Increases scalability of quantum processors by solving wiring and layout challenges.
• Allows high-fidelity, tunable manipulation of individual qubits and interactions between pairs of qubits.
• Improves robustness against charge noise and material defects by enabling local tuning of qubit parameters.
• Reduces crosstalk and hardware complexity by providing spatially separated manipulation, loading, and readout zones.
• Enables independent electrical control of tunnel barriers, detuning, and qubit confinement, supporting diverse quantum operations.
• Compatible with established semiconductor manufacturing processes, facilitating adoption and commercialization.

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Patent Abstract

A manipulation zone for a spin-qubit quantum processor comprising a plurality of gate electrodes (50b-1, 50b-2) arranged on a semiconductor heterostructure (12). The plurality of gate electrodes comprises a first finger gate assembly (50b-1) arranged at a first path (451) in the semiconductor heterostructure and a second finger gate assembly (50b-2) arranged at a second path (452) in the semiconductor heterostructure. The first path and the second path meet at an interface (25). The first finger gate assembly and the second finger gate assembly are configured to be supplied with at least one voltage V, to move along the first path formed and/or the second path at least one qubit, and/or to manipulate a current spin state of the at least one qubit located at the first path and/or the second path. The spin-qubit device further comprises local magnets (35-1, 35-2) and an external magnetic field. An embodiment uses top gates (50d in fig. 3D).