Strong cubic phase shifts on the photonic vacuum state

TL;DR

This paper demonstrates that adding photons to coherent states can produce effects similar to cubic phase shifts on the vacuum, achieving high fidelity and stronger interactions than previously observed, with implications for quantum optics.

Contribution

It reveals a new method to generate strong cubic phase shifts using photon addition, surpassing prior experimental limitations.

Findings

Fidelities over 90% in photon-added coherent states

Interaction strength inversely proportional to displacement

Interactions are non-perturbative and significantly stronger than previous results

Abstract

Addition of photons to coherent states is shown to produce effects that display remarkable similarities with cubic phase shifts acting on the vacuum state, with fidelities in excess of 90 percent. The strength of the cubic interaction is found to vary inversely with the displacement of the coherent state and the strongest interactions were one order of magnitude greater than previous observations. The interaction is non-perturbative.