Decoupling of a Current-Biased Intrinsic Josephson Junction from its Environment

TL;DR

This paper investigates the phase diffusion behavior in high-temperature intrinsic Josephson junction arrays, revealing their isolation at plasma frequency and potential for use in quantum computing.

Contribution

It demonstrates the decoupling of a current-biased intrinsic Josephson junction from its environment at plasma frequency, highlighting its application in quantum device isolation.

Findings

Observed dissipative phase diffusion in Josephson junction arrays

Extracted high impedance (~kilo Ohm) at plasma frequency

Suggests potential use in solid-state quantum computer isolation

Abstract

We have observed a dissipative phase diffusion branch in arrays of hysteretic high-Tc intrinsic Josephson junctions. By comparing the data with a thermal activation model we extract the impedance seen by the junction in which phase diffusion is occurring. At the plasma frequency this junction is isolated from its environment and it sees its own large (~ kilo Ohm) impedance. Our results suggest that stacks of Josephson junctions may be used for isolation purposes in the development of a solid state quantum computer.