Qubit-qudit entanglement transfer in defect centers with high-spin nuclei

• URL: http://arxiv.org/abs/2601.18976v1
• Date: Mon, 26 Jan 2026 21:28:39 GMT
• Title: Qubit-qudit entanglement transfer in defect centers with high-spin nuclei
• Authors: W. -R. Hannes, Guido Burkard,
• Abstract summary: We propose a scheme for accumulating entanglement between long-lived qudits provided by central nuclear spins of defect centers.<n>The generally available Ising component of the hyperfine interaction is shown to facilitate repeated entanglement transfer onto memory qudits.<n>The scheme is applicable to several candidate systems, including the $73$Ge germanium vacancy in diamond.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: We propose a scheme for accumulating entanglement between long-lived qudits provided by central nuclear spins of defect centers. Assuming a generic setting, the electron spin of each node acts as the communication qubit and may be entangled with other nodes, e.g., through a spin-photon interface. The generally available Ising component of the hyperfine interaction is shown to facilitate repeated entanglement transfer onto memory qudits of arbitrary dimension $d\le 2I+1$ with $I$ the nuclear spin quantum number. When $d$ is set to an integer power of two, maximal entanglement can be generated deterministically and without intermittent driving of nuclear spins. The scheme is applicable to several candidate systems, including the $^{73}$Ge germanium vacancy in diamond.

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