Cooper quartets designing in multi-terminal superconducting devices

• URL: http://arxiv.org/abs/2401.04202v1
• Date: Mon, 8 Jan 2024 19:28:15 GMT
• Title: Cooper quartets designing in multi-terminal superconducting devices
• Authors: Luca Chirolli, Alessandro Braggio, Francesco Giazotto
• Abstract summary: Quantum design of Cooper quartets in a double quantum dot system coupled to ordinary superconducting leads is presented. A fundamentally novel, maximally correlated ground state emerges in the form of a superposition of vacuum $|0rangle$ and four-electron state $|4erangle$. The results open the way to the exploration of correlation effects and non-local coherence in hybrid superconducting devices, parity-protected quantum computing schemes and more generally.
• Score: 49.1574468325115
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Quantum design of Cooper quartets in a double quantum dot system coupled to ordinary superconducting leads is presented as a novel platform for the study of an elusive many-body state of matter, that is at the basis of the phenomenon of charge-$4e$ superconductivity. A fundamentally novel, maximally correlated ground state, in the form of a superposition of vacuum $|0\rangle$ and four-electron state $|4e\rangle$, emerges as a narrow resonance and it is promoted by an attractive interdot interaction. A novel phenomenology in the dissipationless transport regime is elucidated, that yields typical flux quantization in units of $h/4e$ and manifests in non-local multi-terminal coherence and in two-Cooper pair transport properties mediated by the quartet ground state. The results open the way to the exploration of correlation effects and non-local coherence in hybrid superconducting devices, parity-protected quantum computing schemes and more generally, the work poses the basis for the design and simulation of novel correlated states of matter starting from ordinary ingredients available in a quantum solid state lab.

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