How to Measure Squeezing and Entanglement of Gaussian States without Homodyning
Jaromı́r Fiurášek, Nicolas J. Cerf · Physical Review Letters · 2004
We propose a scheme for measuring the squeezing, purity, and entanglement of Gaussian states of light that does not require homodyne detection. The suggested setup needs only beam splitters and single-photon detectors. Two-mode entanglement can be detected from coincidences between photodetectors placed on the two beams.