A Proposal for the observation of nonlocal multipair production: the biSQUID
Résumé
We propose an all-superconducting three-terminal setup consisting in a carbon nanotube (or semiconducting nanowire) contacted to three superconducting leads. The resulting device, referred to as a " biSQUID " , is made of four quantum dots arranged in two loops of different surface area. We show how this biSQUID can prove a useful tool to probe nonlocal quantum phenomena in an interferometry setup. We study the measured critical current as a function of the applied magnetic field, which shows peaks in its Fourier spectrum, providing clear signatures of multipair Josephson processes. The device does not require any specific fine-tuning as these features are observed for a wide range of microscopic parameters – albeit with a non-trivial dependence. Competing effects which may play a significant role in actual experimental realizations are also explored.
Origine | Fichiers produits par l'(les) auteur(s) |
---|
Loading...