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arXiv · 2505.07325

Directional entanglement of spin-orbit locked nitrogen-vacancy centers by magnons

Zhiping Xue·Ji Zou·Chengyuan Cai·Gerrit E. W. Bauer·Tao Yu
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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.

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Zhiping Xue, Ji Zou, Chengyuan Cai, Gerrit E. W. Bauer, Tao Yu. 2025-05-12. Directional entanglement of spin-orbit locked nitrogen-vacancy centers by magnons. https://arxiv.org/abs/2505.07325

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