Quantum control and long-range quantum correlations in dynamical Casimir arrays

TL;DR

This paper demonstrates how scalable arrays of modulated superconducting waveguides can generate and control long-range multipartite entangled photon states, advancing quantum technologies with new quantum fluid phenomena.

Contribution

It introduces a scalable array approach for creating and controlling multipartite entangled states via the dynamical Casimir effect, extending beyond single waveguide systems.

Findings

Maximally entangled NOON states can be engineered at finite temperature.

Long-range quantum correlations can be controlled in array configurations.

The work opens pathways for new quantum fluids of light from vacuum fluctuations.

Abstract

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.