Revival of transport reciprocity via quantum interference in asymmetric nonlinear devices

• URL: http://arxiv.org/abs/2607.26898v1
• Date: Wed, 29 Jul 2026 13:28:56 GMT
• Title: Revival of transport reciprocity via quantum interference in asymmetric nonlinear devices
• Abstract summary: We study correlated 2-photon scattering where an artificial atom is asymmetrically side-coupled to an infinite waveguide at two spatially separated points.<n>The setup (a) gives robust reciprocal transport for the two photons.<n>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.
• Score: 0.8002099400210113
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• 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.

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