Sensing decoherence by using edge state

TL;DR

This paper demonstrates that weak decoherence effects on fermionic current can be significantly amplified using edge states in a lattice, enabling better detection of decoherence.

Contribution

The study reveals that edge states can amplify the impact of weak decoherence on fermionic current, improving sensing capabilities.

Findings

Weak decoherence effects are typically undetectable in ballistic fermionic currents.

Edge states can amplify the effect of weak decoherence by orders of magnitude.

Edge state-based sensing enhances decoherence detection sensitivity.

Abstract

In the absence of decoherence the current of fermionic particles across a finite lattice connecting two reservoirs (leads) with different chemical potentials is known to be ballistic. It is also known that decoherence typically suppresses this ballistic current. However, if decoherence is weak, the change in the current may be undetectable. In this work we show that the effect of a weak decoherence can be amplified by orders of magnitude if the lattice has edge states.