Conditional measurements on multimode pairwise entangled states from spontaneous parametric downconversion

A. Allevi; A. Andreoni; F. A. Beduini; M. Bondani; M. G. Genoni; S. Olivares; M. G. A. Paris

doi:10.1209/0295-5075/92/20007

All issues

Volume 92 / No 2 (October 2010)

EPL, 92 2 (2010) 20007

Abstract

Issue		EPL Volume 92, Number 2, October 2010


Article Number		20007
Number of page(s)		6
Section		General
DOI		https://doi.org/10.1209/0295-5075/92/20007
Published online		15 November 2010

EPL, 92 (2010) 20007

Conditional measurements on multimode pairwise entangled states from spontaneous parametric downconversion

A. Allevi¹, A. Andreoni¹^,2, F. A. Beduini⁴, M. Bondani¹^,3, M. G. Genoni⁴^,5, S. Olivares⁴^,5 and M. G. A. Paris⁴^,5^a

¹ 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

^a matteo.paris@fisica.unimi.it

Received: 21 June 2010
Accepted: 8 October 2010

Abstract

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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