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

2025/03/17 by Jinlun Hu, Hu, Jinlun, Antonio L. R. Manesco +9 · 1 citation
#quant-ph

paper · pdf · doi:10.48550/arxiv.2503.13411

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 results in a quadratic 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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