Volume 92, Number 2, October 2010
|Number of page(s)
|15 November 2010
Conditional measurements on multimode pairwise entangled states from spontaneous parametric downconversion
CNISM UdR Como - I-22100 Como, Italia, EU
2 Dipartimento di Fisica e Matematica, Università degli Studi dell'Insubria - I-22100 Como, Italia, EU
3 Istituto di Fotonica e Nanotecnologie - CNR-IFN - I-22100, Como, Italia, EU
4 Dipartimento di Fisica dell'Università degli Studi di Milano - I-20133 Milano, Italia, EU
5 CNISM, UdR Milano Università - I-20133 Milano, Italia, EU
Accepted: 8 October 2010
We address the intrinsic multimode nature of the quantum state of light obtained by pulsed spontaneous parametric downconversion and develop a theoretical model based only on experimentally accessible quantities. We exploit the pairwise entanglement as a resource for conditional multimode measurements and derive closed formulas for the detection probability and the density matrix of the conditional states. We present a set of experiments performed to validate our model in different conditions that are in excellent agreement with experimental data. Finally, we evaluate the non-Gaussianity of the conditional states obtained from our source with the aim of discussing the effects of the different experimental parameters on the effectiveness of this type of conditional state preparation.
PACS: 03.67.Bg – Entanglement production and manipulation / 42.50.Dv – Quantum state engineering and measurements / 03.65.Wj – State reconstruction, quantum tomography
© EPLA, 2010
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