Witnessing entanglement with second-order interference
Magdalena Stobińska, Krzysztof Wódkiewicz · Physical Review A · 2005
Second-order interference and Hanbury-Brown and Twiss--type experiments can provide an operational framework for the construction of witness operators that can test classical and nonclassical properties of a Gaussian squeezed state, and provide entanglement witness operators to study the separability properties of correlated Gaussian squeezed sates.