Flux channeling induced nano-confinement and enhancement of microwaves imaged by Rabi oscillation mapping
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| Main Authors: | , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866915105225048064 |
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| author | Rable, Jeffrey Dwivedi, Jyotirmay Samarth, Nitin Stevenson, Paul Bansil, Arun Kar, Swastik |
| author_facet | Rable, Jeffrey Dwivedi, Jyotirmay Samarth, Nitin Stevenson, Paul Bansil, Arun Kar, Swastik |
| contents | With rapid advances in qubit technologies, techniques for localizing, modulating, and measuring RF fields and their impact on qubit performance are of the utmost importance. Here, we demonstrate that flux-channeling from a permalloy nanowire can be used to achieve localized spatial modulation of an RF field and that the modulated field can be mapped with high resolution using the Rabi oscillations of an NV center. Rabi maps reveal ~100 mm wavelength microwaves concentrated in sub-300 nm-scale regions with up to ~16$\times$ power enhancement. This modulation is robust over a 20 dBm power range and has no adverse impact on NV $T_2$ coherence time. Micromagnetic simulations confirm that the modulated field results from the nanowire's stray field through its constructive/destructive interference with the incident RF field. Our findings provide a new pathway for controlling qubits, amplifying RF signals, and mapping local fields in various on-chip RF technologies. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2501_09183 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Flux channeling induced nano-confinement and enhancement of microwaves imaged by Rabi oscillation mapping Rable, Jeffrey Dwivedi, Jyotirmay Samarth, Nitin Stevenson, Paul Bansil, Arun Kar, Swastik Mesoscale and Nanoscale Physics With rapid advances in qubit technologies, techniques for localizing, modulating, and measuring RF fields and their impact on qubit performance are of the utmost importance. Here, we demonstrate that flux-channeling from a permalloy nanowire can be used to achieve localized spatial modulation of an RF field and that the modulated field can be mapped with high resolution using the Rabi oscillations of an NV center. Rabi maps reveal ~100 mm wavelength microwaves concentrated in sub-300 nm-scale regions with up to ~16$\times$ power enhancement. This modulation is robust over a 20 dBm power range and has no adverse impact on NV $T_2$ coherence time. Micromagnetic simulations confirm that the modulated field results from the nanowire's stray field through its constructive/destructive interference with the incident RF field. Our findings provide a new pathway for controlling qubits, amplifying RF signals, and mapping local fields in various on-chip RF technologies. |
| title | Flux channeling induced nano-confinement and enhancement of microwaves imaged by Rabi oscillation mapping |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2501.09183 |