A transition-metal qubit in diamond with all-optical control and millisecond quantum memory

• URL: http://arxiv.org/abs/2607.02258v1
• Date: Thu, 02 Jul 2026 14:46:01 GMT
• Title: A transition-metal qubit in diamond with all-optical control and millisecond quantum memory
• Abstract summary: Quantum networks require qubits that combine efficient optical access, coherent control, and long-lived quantum memory.<n>Diamond color centers are leading candidates, yet widely studied defects retain tradeoffs among these capabilities.<n>We show that transition-metal defects in diamond provide a distinct route beyond these platforms by combining spin-orbit protected ground-state coherence, all-optical control, and near-infrared emission.
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• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Quantum networks require qubits that combine efficient optical access, coherent control, and long-lived quantum memory, but realizing all three in one scalable platform remains a central bottleneck. Diamond color centers are leading candidates, yet widely studied defects retain tradeoffs among these capabilities. Here, we show that transition-metal defects in diamond provide a distinct route beyond these platforms by combining spin-orbit protected ground-state coherence, all-optical control, and near-infrared emission. Using a single nickel-vacancy (NiV$^-$), we demonstrate an all-optically controlled diamond spin qubit with coherence exceeding one millisecond at 1.65 K, compatible with compact closed-cycle cryogenics. We implement Raman Rabi oscillations and Ramsey interferometry and use all-optical dynamical decoupling to extend coherence from $T_2^*$ = 371 ns to $T_2^{CPMG-4}$ = 1.27 ms, establishing NiV$^-$ as a deployable diamond spin-photon interface.

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