RF-free driving of nuclear spins with color centers in silicon carbide
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| Main Authors: | , , , , , , , |
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| Format: | Preprint |
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2026
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| _version_ | 1866915760738140160 |
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| author | Wörnle, Raphael Körber, Jonathan Steidl, Timo Astakhov, Georgy V. Dasari, Durga B. R. Kaiser, Florian Vorobyov, Vadim Wrachtrup, Jörg |
| author_facet | Wörnle, Raphael Körber, Jonathan Steidl, Timo Astakhov, Georgy V. Dasari, Durga B. R. Kaiser, Florian Vorobyov, Vadim Wrachtrup, Jörg |
| contents | 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2601_21499 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | RF-free driving of nuclear spins with color centers in silicon carbide Wörnle, Raphael Körber, Jonathan Steidl, Timo Astakhov, Georgy V. Dasari, Durga B. R. Kaiser, Florian Vorobyov, Vadim Wrachtrup, Jörg Quantum Physics 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. |
| title | RF-free driving of nuclear spins with color centers in silicon carbide |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2601.21499 |