High-fidelity control of a ¹³C nuclear spin coupled to a tin-vacancy center in diamond

2025/09/03 by Resch, Jeremias, Karapatzakis, Ioannis, Elshorbagy, Mohamed +9 · 1 citation
#FOS: Physical sciences #Quantum Physics (quant-ph)

paper · doi:10.48550/arxiv.2509.03354

Abstract

Nuclear spins near group-IV defects in diamond are promising candidates for quantum memories in quantum network applications. Here, we demonstrate high-fidelity control of a single ¹³C nuclear spin coupled to a tin-vacancy (SnV) center in diamond. We perform a combination of optical and microwave pumping to achieve initialization into a combined electro-nuclear spin state with a fidelity of 99.74(3) %. Harnessing a superconducting waveguide for radio-frequency driving, we demonstrate precise nuclear spin control: Ramsey measurements reveal a coherence time of T₂^* = 1.5(1) milliseconds, and we use dynamical decoupling to extend it to 1.35(3) seconds. We perform randomized benchmarking, yielding a single-qubit gate fidelity of 99.92(1) %. This demonstrates a coherent spin-photon system with promising properties for quantum network nodes.

Citations

• High-Fidelity Single-Shot Readout and Selective Nuclear Spin Control for a Spin-1/2 Quantum Register in Diamond
• Bipartite entanglement in a nuclear spin register mediated by a quasi-free electron spin
• High-Fidelity Control of a Strongly Coupled Electro-Nuclear Spin-Photon Interface
• Cavity-enhanced spectroscopy of individual nuclear spins in a dense bath
• Industrial 300 mm wafer processed spin qubits in natural silicon/silicon-germanium
• Universal high-fidelity quantum gates for spin-qubits in diamond
• Microwave Control of the Tin-Vacancy Spin Qubit in Diamond with a Superconducting Waveguide
• Microwave-Based Quantum Control and Coherence Protection of Tin-Vacancy Spin Qubits in a Strain-Tuned Diamond-Membrane Heterostructure

Cited by

• Above-Unity Coherent Cooperativity of Tin-Vacancy Centers in Diamond Photonic Crystal Cavities

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• Ultra-high strained diamond spin register with coherent optical link
• Robust quantum-network memory based on spin qubits in isotopically engineered diamond
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• High-Fidelity Control of a Strongly Coupled Electro-Nuclear Spin-Photon Interface
• Bipartite entanglement in a nuclear spin register mediated by a quasi-free electron spin