RF-free driving of nuclear spins with color centers in silicon carbide

• URL: http://arxiv.org/abs/2601.21499v1
• Date: Thu, 29 Jan 2026 10:15:57 GMT
• Title: RF-free driving of nuclear spins with color centers in silicon carbide
• Authors: Raphael Wörnle, Jonathan Körber, Timo Steidl, Georgy V. Astakhov, Durga B. R. Dasari, Florian Kaiser, Vadim Vorobyov, Jörg Wrachtrup,
• Abstract summary: We show that coherent control of a coupled nuclear spin is possible without any RF fields.<n>We demonstrate high-fidelity nuclear-spin control, achieving 89% two-qubit tomography fidelity and nearly T1-limited nuclear coherence times.<n>This approach offers a simplified and scalable route for future quantum applications.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Color centers that enable nuclear-spin control without RF fields offer a powerful route towards simplified and scalable quantum devices. Such capabilities are especially valuable for quantum sensing and computing platforms that already find applications in biology, materials science, and geophysics. A key challenge is the coherent manipulation of nearby nuclear spins, which serve as quantum memories and auxiliary qubits but conventionally require additional high-power RF fields which increase the experimental complexity and overall power consumption. Finding systems where both electron and nuclear spins can be controlled using a single MW source is therefore highly desirable. Here, using a modified divacancy center in silicon carbide, we show that coherent control of a coupled nuclear spin is possible without any RF fields. Instead, MW pulses driving the electron spin also manipulate the nuclear spin through hyperfineenhanced effects, activated by a precisely tilted external magnetic field. We demonstrate high-fidelity nuclear-spin control, achieving 89% two-qubit tomography fidelity and nearly T1-limited nuclear coherence times. This approach offers a simplified and scalable route for future quantum applications.

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