The recent observation of the dynamical Casimir effect in a modulated superconducting waveguide, coronating thirty years of world-wide research, empowered the quantum technology community with a powerful tool to create entangled photons on-chip. In this work we show how, going beyond the single waveguide paradigm using a scalable array, it is possible to create multipartite nonclassical states, with the possibility to control the long-range quantum correlations of the emitted photons. In particular, our finite-temperature theory shows how maximally entangled NOON states can be engineered in a realistic setup. The results here presented open the way to new kinds of quantum fluids of light, arising from modulated vacuum fluctuations in linear systems.
@article{arxiv.1501.07536,
title = {Quantum control and long-range quantum correlations in dynamical Casimir arrays},
author = {Roberto Stassi and Simone De Liberato and Luigi Garziano and Bernardo Spagnolo and Salvatore Savasta},
journal= {arXiv preprint arXiv:1501.07536},
year = {2015}
}