Intermediate states in Andreev bound state fusion

Abstract

Hybridization is a very fundamental quantum mechanical phenomenon, with the text book example of binding two hydrogen atoms in a hydrogen molecule. In semiconductor physics, a quantum dot (QD) can be considered as an artificial atom, with two coupled QDs forming a molecular state, and two electrons on a single QD the equivalent of a helium atom. Here we report tunnel spectroscopy experiments illustrating the hybridization of another type of discrete quantum states, namely of superconducting subgap states that form in segments of a semiconducting nanowire in contact with superconducting reservoirs. We show and explain a collection of intermediate states found in the process of merging individual bound states, hybridizing with a central QD and eventually coherently linking the reservoirs. These results may serve as a guide in future Majorana fusion experiments and explain a large variety of recent bound state experiments.

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Cited by in corpus (4)

• Phase-dependent Andreev molecules and superconducting gap closing in coherently coupled Josephson junctions
• Dephasing in a crystal-phase defined double quantum dot charge qubit strongly coupled to a high-impedance resonator
• Fermionic Quantum Simulation on Andreev Bound State Superlattices
• Andreev molecules at distance