Photon-mediated localization in two-level qubit arrays

TL;DR

This paper predicts a new form of photon-mediated spatial localization in qubit arrays, where interactions induce a quantum self-organized optical lattice trapping photons, driven by photon blockade and waveguide coupling.

Contribution

It introduces a novel quantum localization phenomenon in qubit arrays, modeling a self-induced optical lattice caused by photon interactions and waveguide coupling.

Findings

Localization arises from photon blockade and long-range waveguide interactions.

The phenomenon is a quantum analogue of classical optical lattices.

Potential applications in quantum information processing.

Abstract

We predict the existence of a novel interaction-induced spatial localization in a periodic array of qubits coupled to a waveguide. This localization can be described as a quantum analogue of a self-induced optical lattice between two indistinguishable photons, where one photon creates a standing wave that traps the other photon. The localization is caused by the interplay between on-site repulsion due to the photon blockade and the waveguide-mediated long-range coupling between the qubits.