Dephasing in an Aharonov-Bohm interferometer containing a lateral double quantum dot induced by coupling with a quantum dot charge sensor

TL;DR

This paper theoretically examines how coupling with a quantum dot charge sensor causes dephasing in an Aharonov-Bohm interferometer with a double quantum dot, revealing a monotonic decrease in oscillation visibility with increasing interaction.

Contribution

It introduces a theoretical model using interpolative 2nd-order perturbation theory to analyze charge sensing-induced dephasing in quantum dot interferometers.

Findings

Visibility decreases monotonically with increased Coulomb interaction.

Parabolic decrease in weak interaction regime.

Linear decrease in strong interaction regime.

Abstract

We theoretically investigated the dephasing in an Aharonov-Bohm interferometer containing a lateral double quantum dot induced by coupling with a quantum dot charge sensor. We employed the interpolative 2nd-order perturbation theory to include the charge sensing Coulomb interaction. It is shown that the visibility of the Aharonov-Bohm oscillation of the linear conductance decreases monotonically as the sensing Coulomb interaction increases. In particular, for a weak sensing interaction regime, the visibility decreases parabolically, and it behaves linearly for a strong sensing interaction regime.