Revival of transport reciprocity via quantum interference in asymmetric nonlinear devices

Rupak Bag; Dibyendu Roy

Revival of transport reciprocity via quantum interference in asymmetric nonlinear devices

Quantum Physics 2026-07-29 v1 Mesoscale and Nanoscale Physics Optics

Authors: Rupak Bag , Dibyendu Roy

Abstract

Structural asymmetry combined with optical nonlinearity often leads to nonreciprocal light transport. We explore the mechanism by which 1-photon interference effects can revive reciprocity in such nonlinear models. To this end, we study correlated 2-photon scattering where an artificial atom is asymmetrically (a) side-coupled to an infinite waveguide at two spatially separated points, and (b) direct-coupled to two semi-infinite waveguides. The setup (a) gives robust reciprocal transport for the two photons. However, the setup (b) shows a transition from a nonreciprocal to a reciprocal regime by tuning the interference effect via an additional tunneling path for photons between the two waveguides.

Keywords

nonreciprocal transport quantum interference nonlinear devices two-photon scattering artificial atom waveguide

Cite

@article{arxiv.2607.26898,
  title  = {Revival of transport reciprocity via quantum interference in asymmetric nonlinear devices},
  author = {Rupak Bag and Dibyendu Roy},
  journal= {arXiv preprint arXiv:2607.26898},
  year   = {2026}
}