Nonseparable Werner states in spontaneous parametric down-conversion
- Dipartimento di Fisica, Universita 'La Sapienza', Rome 00185 (Italy)
- Centro di Studi e Ricerche 'Enrico Fermi', Via Panisperna 89/A, Compendio del Viminale, Rome 00184 (Italy)
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.
- OSTI ID:
- 20786861
- Journal Information:
- Physical Review. A, Journal Name: Physical Review. A Journal Issue: 3 Vol. 73; ISSN 1050-2947; ISSN PLRAAN
- Country of Publication:
- United States
- Language:
- English
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