Universal Quantum Computing Using Electro-Nuclear Wavefunctions of Rare-Earth Ions

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This patent describes a universal quantum computing system that uses rare-earth (RE) ions embedded in an insulating solid-state matrix. Each RE ion encodes a qubit using its nuclear spin, which can be operated in a 'passive' (memory) or 'active' (gate operation) mode by optically controlling its electronic state with laser pulses. The system enables fast and selective quantum gate operations, including both single- and two-qubit gates, through electro-nuclear interactions, making the scheme suitable for scalable quantum computing applications.

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• Scalable universal quantum computers for scientific research and industry.
• Quantum information storage with long coherence times (quantum memory).
• Quantum repeaters and nodes in quantum communication networks (e.g., using telecommunications-appropriate RE ions).
• Quantum simulators for materials science and chemistry using configurable 2D qubit arrays.
• Advancement and experimentation in solid-state quantum device fabrication (e.g., using rare-earth-doped silicon or thin layers).

BenefitsContent extracted from patent full text and abstract with AI.

• Significantly faster quantum gate operations compared to previous rare-earth ion approaches (up to 100x for two-qubit gates; 600x for single-qubit gates).
• Long coherence and memory times, enabling reliable quantum computation and storage.
• Selective activation allows two-qubit operations between distant qubits, enhancing connectivity and scalability versus nearest-neighbor-only systems.
• Electrical and optical control enables precise addressability and manipulation of individual qubits in large arrays.
• Potential for high-fidelity operation and scalability to large numbers of qubits using proven solid-state and semiconductor fabrication methods.
• Compatibility with optical readout and integration with photonic and telecommunication systems.

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Patent Abstract

The present invention discloses an universal quantum computing system using electro-nuclear wavefunctions of rare-earth ions, comprising: a) a 2d-matrix of rare-earth ions being embedded in an insulating solid state matrix, wherein: b) each rare-earth ion representing a nuclear qubit that can be selectively operated as a passive qubit or as an active qubit; c) said passive qubit being represented by a passive electronic doublet at a non-degenerate ground state thereby storing the quantum information in the two different nuclear pin states possible in this non-degenerate ground state causing two different passive-state electro-nuclear wavefunctions, and d) said active qubit being represented by an active electronic doublet at a non-degenerate excited state thereby storing the quantum information in the two different nuclear pin states possible in this non-degenerate excited state causing to different active-state electro-nuclear wavefunctions, and e) a laser source for selectively generating laser pulses in order to optically excite the rare-earth ions from the non- degenerated ground state into the non-degenerate excited state and vice versa, thereby locally controlling the electronic dipolar interaction in a tunable manner among at least two active qubits, and f) an external electrical field in form of switchable electric gates for inducing a Stark shift for a selectable qubit, and g) an external magnetic field.