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Opportunities for Long-Range Magnon-Mediated Entanglement of Spin Qubits via On- and Off-Resonant Coupling

Fukami, Masaya ; Candido, Denis R. ; Awschalom, David D. ; Flatté, Michael E.

PRX quantum, 2021-10, Vol.2 (4), p.040314, Article 040314 [Periódico revisado por pares]

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Título:
Opportunities for Long-Range Magnon-Mediated Entanglement of Spin Qubits via On- and Off-Resonant Coupling
Autor: Fukami, Masaya ; Candido, Denis R. ; Awschalom, David D. ; Flatté, Michael E.
É parte de: PRX quantum, 2021-10, Vol.2 (4), p.040314, Article 040314
Notas: USDOE
Descrição: The ability to manipulate entanglement between multiple spatially separated qubits is essential for quantum-information processing. Although nitrogen-vacancy (NV) centers in diamond provide a promising qubit platform, developing scalable two-qubit gates remains a well-known challenge. To this end, magnon-mediated entanglement proposals have attracted attention due to their long-range spin-coherent propagation. Optimal device geometries and gate protocols of such schemes, however, have yet to be determined. Here we predict strong long-distance (>μm) NV-NV coupling via magnon modes with cooperativities exceeding unity in ferromagnetic bar and waveguide structures. Moreover, we explore and compare on-resonant transduction and off-resonant virtual-magnon exchange protocols, and discuss their suitability for generating or manipulating entangled states at low temperatures (T≲150mK) under realistic experimental conditions. This work will guide future experiments that aim to entangle spin qubits in solids with magnon excitations.
Editor: United States: American Physical Society
Idioma: Inglês

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