Aharonov-Casher Effect and the Coherent Flux Tunneling in the Hybrid Charge Quantum Interference Device

TL;DR

This paper demonstrates how the Aharonov-Casher effect can suppress magnetic flux tunneling in a hybrid charge quantum interference device, revealing charge-sensitive control over quantum flux phenomena.

Contribution

It introduces a novel hybrid device leveraging the Aharonov-Casher effect to control flux tunneling, with experimental insights into charge sensitivity and quasiparticle poisoning effects.

Findings

Suppression of flux tunneling via Aharonov-Casher effect

Charge control of quantum interference in the device

Observation of quasiparticle poisoning impacts

Abstract

By exploiting the Aharonov-Casher effect we demonstrate a suppression of magnetic flux tunneling in a Hybrid Charge Quantum Interference Device. The main part of this device is two Josephson junctions with a small superconducting island between them. To minimize phase fluctuations across Josephson junctions, this structure is embedded in a compact super-inductive NbN loop. The Interference between the flux tunneling paths is determined by the island-induced charge, which is controlled by an external voltage. The charge sensitive operation of the device is subjected to poisoning by the quasiparticles generated in the NbN film.