Multiphoton Entanglement by Delocalized Single Photon Addition
Nicola Biagi, Luca S. Costanzo, Marco Bellini, Alessandro Zavatta · 2019
We report about the generation of entangled states obtained by applying delocalized single-photon addition between two uncorrelated light modes populated by coherent states. Such entangled states can contain an arbitrary large number of photons while preserving their non-classical correlations. Besides their importance to study quantum effects in large-scale systems, these states are found to be surprisingly robust against losses and thus well suited to travel over long distances and to be stored in atomic ensembles.