Nonseparable Werner states in spontaneous parametric down-conversion

Journal Article · Wed Mar 15 00:00:00 EST 2006 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.73.0· OSTI ID:20786861

Caminati, Marco; De Martini, Francesco; Perris, Riccardo; Secondi, Veronica ^[1]; Sciarrino, Fabio ^[2]

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1. Dipartimento di Fisica, Universita 'La Sapienza', Rome 00185 (Italy)
2. 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, Vol. 73, Issue 3; Other Information: DOI: 10.1103/PhysRevA.73.032312; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1050-2947
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
CONVERSION
ENERGY LEVELS
GAIN
MULTI-PHOTON PROCESSES
NONLINEAR PROBLEMS
OPTICS
PHOTONS
QUANTUM ENTANGLEMENT
QUANTUM MECHANICS
TOMOGRAPHY