• Quantum Physics [Submitted on 16 Feb 2026 (v1), last revised 24 Feb 2026 (this version, v2)] Title:Instruction-Set Architecture for Programmable NV-Center Quantum Repeater Nodes View PDF HTML (experimental)Abstract:Programmability is increasingly central in emerging quantum network software stacks, yet the node-internal controller-to-hardware interface for quantum repeater devices remains under-specified • We introduce the idea of an instruction-set architecture (ISA) for controller-driven programmability of nitrogen-vacancy (NV) center quantum repeater nodes • Each node consists of an optically interfaced electron spin acting as a data qubit and a long-lived nuclear-spin register acting as a control program • We formalize two modes of programmability: (i) deterministic register control, where the nuclear register is initialized in a basis state to select a specific operation on the data qubit; and (ii) coherent register control, where the register is prepared in superposition, enabling coherent combinations of operations beyond classical programmability • Network protocols are expressed as controller-issued instruction vectors, which we illustrate through a compact realization of the

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  • Quantum Physics [Submitted on 16 Feb 2026 (v1), last revised 24 Feb 2026 (this version, v2)] Title:Instruction-Set Architecture for Programmable NV-Center Quantum Repeater Nodes View PDF HTML (experimental)Abstract:Programmability is increasingly central in emerging quantum network software stacks, yet the node-internal controller-to-hardware interface for quantum repeater devices remains under-specified. We introduce the idea of an instruction-set architecture (ISA) for controller-driven programmability of nitrogen-vacancy (NV) center quantum repeater nodes. Each node consists of an optically

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