A two qubit quantum gate, namely the C-Phase, has been realized by exploiting the longitudinal momentum (i.e. the optical path) degree of freedom of a single photon. The experimental setup used to engineer this quantum gate represents an advanced version of the high stability closed-loop interferometric setup adopted to generate and characterize 2-photon 4-qubit Phased Dicke states. Some experimental results, dealing with the characterization of multipartite entanglement of the Phased Dicke states are also discussed in detail.
@article{arxiv.1204.2663,
title = {Engineering a C-Phase quantum gate: optical design and experimental realization},
author = {Andrea Chiuri and Chiara Greganti and Paolo Mataloni},
journal= {arXiv preprint arXiv:1204.2663},
year = {2015}
}