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Cooper quartets are an exotic electronic state composed of correlated four electron excitations, generalizing the concept of Cooper pairs to charge-4e superconductors. While the latter are yet to be realised experimentally as a macroscopic phase, hybrid superconducting nanodevices may offer a highly-tunable and well-studied platform for the realisation and investigation of quartet states. Following [1], we study signatures of Cooper quartets in a system composed of a double quantum dot (DQD) coupled to normal and superconducting leads in the limit of large gap. In this configuration, we show non-equilibrium signatures of quartet correlations in the current noise, allowing the experimental detection of quartet states in a controllable, well-understood setting.
[1] L. Chirolli, A. Braggio, and F. Giazotto, Phys. Rev. Res. 6, 033171 (2024).