Superbunching from coherently driven atoms in a waveguide

TL;DR

This paper studies how coherently driven atoms in a waveguide produce superbunched photon scattering, revealing a process where all atoms are excited, enabling heralded multi-photon states for quantum technologies.

Contribution

It demonstrates that increasing atom number enhances photon bunching and suppresses transmission, leading to a novel incoherent superbunching process in waveguide QED.

Findings

Transmission is suppressed with more atoms.

Photon bunching is significantly enhanced, reaching superbunching.

All atoms being excited enables heralded multi-photon state generation.

Abstract

We investigate the scattered field from $N$ identical two-level atoms resonantly driven by a weak coherent field in a one-dimensional waveguide. For atoms separated by the drive wavelength, increasing the number of atoms progressively suppresses transmission while enhancing photon bunching. Transmission becomes a superbunched $(N+1)$-photon scattering process that is predominantly incoherent. Remarkably, we find that this transmission is only possible through a process where all $N$ atoms are excited, enabling heralded multi-photon state generation with applications in long-distance entanglement and quantum metrology.