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Directional entanglement of spin-orbit locked nitrogen-vacancy centers by magnons
Phys. Rev. B 112, 094438 – Published 19 September, 2025
DOI: https://doi.org/10.1103/9rvd-h7yq
Abstract
We address that the stray magnetic field emitted by the excited quantum states of the nitrogen-vacancy (NV) centers is spin-momentum locked, such that the spin transfer to nearby ferromagnetic nanostructures is unidirectional. This may allow the controlled excitation of propagating magnons by NV centers in diamond. A pair of NV spin qubits exchange virtual magnons in a magnetic nanowire in a chiral manner that leads to directional quantum entanglement. A magnon-based “quantum-entanglement isolator” should be a useful device in future quantum information technology.
