Supercurrent through an Andreev trimer

Abstract

Detection and control of Andreev Bound States (ABSs) localized at semiconductor-superconductor interfaces are essential for their use in quantum applications. Here we investigate the impact of ABSs on the supercurrent through a Josephson junction containing a quantum dot (QD). Additional normal-metal tunneling probes on both sides of the junction unveil the ABSs residing at the semi-superconductor interfaces. Such knowledge provides an ingredient missing in previous studies, improving the connection between theory and experimental data. By varying the ABS energies using electrostatic gates, we show control of the switching current, with the ability to alter it by more than an order of magnitude. Finally, the large degree of ABS tunability allows us to realize a three-site ABS-QD-ABS molecule (Andreev trimer) in which the central QD is screened by both ABSs. This system is studied simultaneously using both supercurrent and spectroscopy.

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Cited by in corpus (7)

• Signatures of Majorana protection in a three-site Kitaev chain
• Exploring the energy spectrum of a four-terminal Josephson junction: Towards topological Andreev band structures
• Fermionic Quantum Simulation on Andreev Bound State Superlattices
• Characterizing local Majorana properties using Andreev states
• Optimal Majoranas in Mesoscopic Kitaev Chains
• Magnetic flux controlled current phase relationship in double Quantum Dot Josephson junction
• Effects of electron-electron interaction and spin-orbit coupling on Andreev pair qubits in quantum dot Josephson junctions