Mixed spin-boson coupling for qubit readout with suppressed residual shot-noise dephasing

• URL: http://arxiv.org/abs/2503.13411v1
• Date: Mon, 17 Mar 2025 17:40:28 GMT
• Title: Mixed spin-boson coupling for qubit readout with suppressed residual shot-noise dephasing
• Authors: Jinlun Hu, Antonio L. R. Manesco, André Melo, Taryn V. Stefanski, Christian Kraglund Andersen, Valla Fatemi,
• Abstract summary: We study a coupling that is mixed between two pairs of quadratures of a bosonic mode and a spin.<n>In this setting, we can suppress the dispersive shift while retaining a nonzero Kerr shift.<n>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.
• Score: 0.3562485774739681
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: 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.

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