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| Autori principali: | , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| Soggetti: | |
| Accesso online: | https://arxiv.org/abs/2503.13411 |
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| _version_ | 1866917959199358976 |
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| author | Hu, Jinlun Manesco, Antonio L. R. Melo, André Stefanski, Taryn V. Andersen, Christian Kraglund Fatemi, Valla |
| author_facet | Hu, Jinlun Manesco, Antonio L. R. Melo, André Stefanski, Taryn V. Andersen, Christian Kraglund Fatemi, Valla |
| contents | Direct dipole coupling between a two-level system and a bosonic mode describes the interactions present in a wide range of physical platforms. In this work, we study a coupling that is mixed between two pairs of quadratures of a bosonic mode and a spin. In this setting, we can suppress the dispersive shift while retaining a nonzero Kerr shift, which remarkably results in a cubic relationship between shot noise dephasing and thermal photons in the oscillator. We demonstrate this configuration with a simple toy model, quantify the expected improvements to photon shot-noise dephasing of the spin, and describe an approach to fast qubit readout via the Kerr shift. Further, we show how such a regime is achievable in superconducting circuits because magnetic and electric couplings can be of comparable strength, using two examples: the Cooper pair transistor and the fluxonium molecule. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2503_13411 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Mixed spin-boson coupling for qubit readout with suppressed residual shot-noise dephasing Hu, Jinlun Manesco, Antonio L. R. Melo, André Stefanski, Taryn V. Andersen, Christian Kraglund Fatemi, Valla Quantum Physics Direct dipole coupling between a two-level system and a bosonic mode describes the interactions present in a wide range of physical platforms. In this work, we study a coupling that is mixed between two pairs of quadratures of a bosonic mode and a spin. In this setting, we can suppress the dispersive shift while retaining a nonzero Kerr shift, which remarkably results in a cubic relationship between shot noise dephasing and thermal photons in the oscillator. We demonstrate this configuration with a simple toy model, quantify the expected improvements to photon shot-noise dephasing of the spin, and describe an approach to fast qubit readout via the Kerr shift. Further, we show how such a regime is achievable in superconducting circuits because magnetic and electric couplings can be of comparable strength, using two examples: the Cooper pair transistor and the fluxonium molecule. |
| title | Mixed spin-boson coupling for qubit readout with suppressed residual shot-noise dephasing |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2503.13411 |