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

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  • Matthieu Vanhoecke

    (PSL Research University)

  • Marco Schirò

    (PSL Research University)

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.

Suggested Citation

  • Matthieu Vanhoecke & Marco Schirò, 2025. "Kondo-Zeno crossover in the dynamics of a monitored quantum dot," Nature Communications, Nature, vol. 16(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:16:y:2025:i:1:d:10.1038_s41467-025-61287-y
    DOI: 10.1038/s41467-025-61287-y
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