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Article Dans Une Revue Physical Review B Année : 2023

A quantum interferometer for quartets in superconducting three-terminal Josephson junctions

Régis Mélin

Résumé

An interferometric device is proposed in order to analyze the quartet mode in biased three-terminal Josephson junctions (TTJs), and to provide experimental evidence for emergence of a single stationary phase, the so-called quartet phase. In such a quartet-Superconducting Quantum Interference Device (quartet-SQUID), the flux sensitivity exhibits period $hc/4e$, which is the fingerprint of a transient intermediate state involving two entangled Cooper pairs. The quartet-SQUID provides two informations: an amplitude that measures a total ``quartet critical current'', and a phase lapse coming from the superposition of the following two current components: the quartet supercurrent that is odd in the quartet phase, and the phase-sensitive multiple Andreev reflection (phase-MAR) quasiparticle current, which occurs in transparent enough TTJs and is even in the quartet phase. Evidence for the latter plays against conservative scenarii involving synchronization of AC Josephson currents, based on ``adiabatic'' phase dynamics and RSJ-like models.
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Dates et versions

hal-03986135 , version 1 (11-08-2023)

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Régis Mélin, Denis Feinberg. A quantum interferometer for quartets in superconducting three-terminal Josephson junctions. Physical Review B, 2023, 107 (16), pp.L161405. ⟨10.1103/PhysRevB.107.L161405⟩. ⟨hal-03986135⟩
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