Kondo-Zeno crossover in the dynamics of a monitored quantum dot

Matthieu Vanhoecke and Marco Schirò ()
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Matthieu Vanhoecke: PSL Research University
Marco Schirò: PSL Research University

Nature Communications, 2025, vol. 16, issue 1, 1-8

Abstract: Abstract Continuously monitoring a quantum system can strongly affect its properties and even suppress its coherent evolution via the Quantum Zeno effect. Here we focus on one of the simplest entangled many-body state, arising via the Kondo effect in a strongly interacting quantum dot coupled to a metallic bath, and investigate the effect of continuous monitoring of the dot total charge. We show that the decay rate of an initially polarized spin displays a crossover from Kondo screening to Quantum Zeno effect. Remarkably, the long-lived Kondo state is robust to weak dissipation, as confirmed by the dot spectral function which features a clear Kondo peak at finite dissipation, even in a regime where charge fluctuations and the associated Hubbard bands have been quenched by the monitoring protocol. We derive an effective model for the long-time dynamics which is described, at weak dissipation, by a non-Hermitian Kondo model.

Date: 2025
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DOI: 10.1038/s41467-025-61287-y

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