Caminati, Marco and De Martini, Francesco and Perris, Riccardo and Sciarrino, Fabio and Secondi, Veronica (2006) Nonseparable Werner states in spontaneous parametric down-conversion. Physical review a, 73: 032312. ISSN 1050-2947
Full text not available from this repository.Abstract
The multiphoton states generated by high-gain spontaneous parametric down-conversion (SPDC) in the presence of large losses are investigated theoretically and experimentally. The explicit form for the two-photon output state has been found to exhibit a Werner structure very resilient to losses for any value of the nonlinear gain parameter g. The theoretical results are found to be in agreement with experimental data obtained by “entanglement witness” methods and by the quantum tomography of the state generated by a high-g SPDC.