All-electrical Coherent Control of a Single Rare-earth Spin Qubit

• URL: http://arxiv.org/abs/2608.07929v1
• Date: Sat, 08 Aug 2026 05:28:49 GMT
• Title: All-electrical Coherent Control of a Single Rare-earth Spin Qubit
• Abstract summary: Electrical control of single spin qubits is a major frontier for nanoscale, high-speed, and scalable quantum devices.<n>Here we demonstrate all-electrical coherent control of a single Er electron spin, which is exchange-coupled to a nearby Ti atom.<n>The electrical modulation of the anisotropic Er-Ti coupling results in an efficient drive of the Er spin, allowing us to achieve near-gigahertz Rabi frequencies.
• Score: 5.744969869929327
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Electrical control of single spin qubits is a major frontier for nanoscale, high-speed, and scalable quantum devices. Yet, extending it to highly shielded rare-earth 4f electrons remains an experimental challenge across solid-state platforms. Here we demonstrate all-electrical coherent control of a single Er electron spin, which is exchange-coupled to a nearby Ti atom. Scanning tunneling microscopy-based electron spin resonance with three-dimensional magnetic-field control enables comprehensive mapping of the resonance and Rabi frequencies, revealing pronounced anisotropies in both the Er g-tensor and the Er-Ti exchange interaction. The electrical modulation of the anisotropic Er-Ti coupling results in an efficient drive of the Er spin, allowing us to achieve near-gigahertz Rabi frequencies - a ten-fold improvement over the present record for rare-earth spin qubits. By establishing anisotropic exchange as a general resource for electrically accessing shielded rare-earth spins, our results open a new route to ultrafast and local control of rare-earth spins in solid-state quantum devices.

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