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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