Eur. Phys. J. D (2012) 66: 241
https://doi.org/10.1140/epjd/e2012-30036-2

Regular Article

Quantum coherent control of highly multipartite continuous-variable entangled states by tailoring parametric interactions

¹ Laboratoire de Physique des Lasers, Atomes et Molécules, Université Lille 1, 59655 Villeneuve d’Ascq Cedex, France
² Departament d’Òptica, Universitat de València, Dr. Moliner 50, 46100 Burjassot, Spain
³ Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Strasse 1, 85748 Garching, Germany
⁴ Laboratoire Kastler Brossel, Université Pierre et Marie Curie-Paris 6, ENS, CNRS, 4 place Jussieu CC74, 75252 Paris Cedex 05, France

^a e-mail: Giuseppe.Patera@phlam.univ-lille1.fr

Received: 15 January 2012
Received in final form: 23 May 2012
Published online: 28 September 2012

Abstract

The generation of continuous-variable multipartite entangled states is important for several protocols of quantum information processing and communication, such as one-way quantum computation or controlled dense coding. In this article we theoretically show that multimode optical parametric oscillators can produce a great variety of such states by an appropriate control of the parametric interaction, what we accomplish by tailoring either the spatio-temporal shape of the pump, or the geometry of the nonlinear medium. Specific examples involving currently available optical parametric oscillators are given, hence showing that our ideas are within reach of present technology.