Related papers: Bipartite entanglement in a nuclear spin register mediated by a quasi-free electron spin

Bipartite entanglement in a nuclear spin register mediated by a quasi-free electron spin

URL: http://arxiv.org/abs/2508.05255v1
Date: Thu, 07 Aug 2025 10:45:14 GMT
Title: Bipartite entanglement in a nuclear spin register mediated by a quasi-free electron spin
Authors: Marco Klotz, Andreas Tangemann, David Opferkuch, Alexander Kubanek,
Abstract summary: Quantum networks will rely on photons entangled to robust, local quantum registers for computation and error correction.<n>We demonstrate control of and entanglement in a fully connected three-qubit $13mathrmC$ nuclear spin register in diamond.
Score: 42.3174494827458
License: http://creativecommons.org/licenses/by/4.0/
Abstract: Quantum networks will rely on photons entangled to robust, local quantum registers for computation and error correction. We demonstrate control of and entanglement in a fully connected three-qubit $^{13}\mathrm{C}$ nuclear spin register in diamond. The register is coupled to a quasi-free electron spin-1/2 of a silicon-vacancy center (SiV). High strain decouples the SiVs electron spin from spin-orbit interaction reducing the susceptibility to phonons at liquid helium temperature. As a result, the electron spin lifetime of hundreds of milli seconds enables sensing of nuclear-nuclear couplings down to few hertz. To detect and control the register we leverage continuous decoupling using shaped, low-power microwave and direct radio frequency driving. Furthermore, we implement a nuclear spin conditional phase-gate on the electron spin to mediate bipartite entanglement. This approach presents an alternative to dynamically decoupled nuclear spin entanglement, not limited by the electron spin's 1/2 nature, opening up new avenues to an optically-accessible, solid-state quantum register.

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