Entanglement in a parametric converter
Su‐Yong Lee, Shahid Qamar, Hai-Woong Lee, Muhammad Suhail Zubairy · Journal of Physics B Atomic Molecular and Optical Physics · 2008
In this paper, we consider a parametric converter as a source of entangled radiation. We examine recently derived conditions (Hillery and Zubairy 2006 Phys. Rev. Lett. 96 050503, Duan et al 2000 Phys. Rev. Lett. 84 2722) for determining when the two output modes in a parametric converter are entangled. We show that for different initial field states, the two criteria give different conditions that ensure that the output states are entangled. We also present an input–output calculation for the entanglement of the output field.