Highly tunable ultrafast control of a spin qubit

Article Nanoscience & Nanotechnology

On-demand electrical control of spin qubits

Will Gilbert et al.

Summary: This study demonstrates fast electrical control of electron spin in silicon quantum dots by exploiting the switchable interaction between spin and orbital motion of electrons without using a micromagnet. By controlling the energy quantization of electrons in nanostructures, the weak effects of the relativistic spin-orbit interaction in silicon are enhanced, leading to a significant increase in Rabi frequency. The achieved coherence time, gate performance, and gate fidelity show the potential for high-performance all-electrical control in scalable silicon quantum computing.

NATURE NANOTECHNOLOGY (2023)

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Article Multidisciplinary Sciences

Fast universal quantum gate above the fault-tolerance threshold in silicon

Akito Noiri et al.

Summary: Fault-tolerant quantum computers rely on quantum error correction, and the surface code is one of the most promising error correction codes. However, only a few qubit platforms have met the required gate fidelities. In this study, the researchers demonstrate high-fidelity gate operations in silicon spin qubits using fast electrical control and a micromagnet-induced gradient field. The results show a two-qubit gate fidelity of 99.5% and single-qubit gate fidelities of 99.8%, surpassing the fault-tolerance threshold for universal gates.

NATURE (2022)

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Article Multidisciplinary Sciences

Quantum logic with spin qubits crossing the surface code threshold

Xiao Xue et al.

Summary: In this study, a spin-based quantum processor in silicon with high gate fidelities for single-qubit and two-qubit gates was reported. The gate fidelities were above 99.5%, and the processor was used to calculate molecular ground-state energies with high accuracy. The breakthrough in achieving a two-qubit gate fidelity above 99% positions semiconductor qubits for fault tolerance and potential applications in the era of noisy intermediate-scale quantum devices.

NATURE (2022)

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Article Multidisciplinary Sciences

Precision tomography of a three-qubit donor quantum processor in silicon

Mateusz T. Madzik et al.

Summary: This study demonstrates universal quantum logic operations using nuclear spins in a silicon nanoelectronic device, achieving high-fidelity entangled states. The precise characterization of quantum operations shows that nuclear spins are approaching the performance required for fault-tolerant quantum processors. Additionally, the entanglement between nuclear spins and electron spins is also demonstrated. The results establish a viable route for scalable quantum information processing using donor nuclear and electron spins.

NATURE (2022)

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Article Multidisciplinary Sciences

Two-qubit silicon quantum processor with operation fidelity exceeding 99%

Adam R. Mills et al.

Summary: Silicon spin qubits have the potential to become the dominant technology in the development of intermediate-scale quantum processors. However, there are still shortcomings in achieving high-fidelity state preparation and readout, as well as single- and two-qubit gate operations.

SCIENCE ADVANCES (2022)

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Article Quantum Science & Technology

Fast spin-valley-based quantum gates in Si with micromagnets

Peihao Huang et al.

Summary: The electron spin qubit in silicon quantum dots shows promise for quantum information processing due to scalability and long coherence. Recent progress utilizing micromagnets to generate synthetic spin-orbit coupling has enabled high-fidelity spin manipulation and strong interaction with cavity photons. Despite technical challenges, enhancing electrical manipulation and controlling spin dephasing through spin-valley mixing can lead to high-quality spin qubits.

NPJ QUANTUM INFORMATION (2021)

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Article Physics, Multidisciplinary