A flexible theoretical framework to describe multimode photon-subtraction
Mohamed Faouzi Melalkia, F. Brunel, Sébastien Tanzilli, Jean Etesse, Virginia D’Auria · arXiv (Cornell University) · 2021
This work establishes a versatile theoretical framework that explicitly describes non-Gaussian states that are obtained, in an heralded fashion, by applying a single-photon subtraction to a multimode resource. The treatment focuses on the very common experimental situation in which no mode-selective operation is available. The obtained theoretical framework allows retrieving, given a multimode input state, optimal conditions for heralding as well as for non-Gaussian feature detection, thus providing a powerful toolbox for experiments' design. The application of the proposed approach to the case study of Schr\odinger kitten preparation starting from a frequency multimode squeezed state illustrates the pertinence and impact of the derived theoretical tools.