Pure dephasing increases partition noise in the quantum Hall effect
Mesoscale and Nanoscale Physics
2026-02-11 v2
Abstract
Quantum Hall edge channels partition electric charge over N chiral (uni-directional) modes. Intermode scattering leads to partition noise, observed in graphene p-n junctions. While inelastic scattering suppresses this noise by averaging out fluctuations, we show that pure (quasi-elastic) dephasing may enhance the partition noise. The noise power increases by up to 50% for two modes, with a general enhancement factor of 1+1/N in the strong-dephasing limit. This counterintuitive effect is explained in the framework of monitored quantum transport, arising from the self-averaging of quantum trajectories.
Cite
@article{arxiv.2509.10242,
title = {Pure dephasing increases partition noise in the quantum Hall effect},
author = {C. W. J. Beenakker},
journal= {arXiv preprint arXiv:2509.10242},
year = {2026}
}
Comments
8 pages, 6 figures; V2: improved and shortened appendix A