Two independent photon pairs versus four-photon entangled states in parametric down conversion

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Title		Two independent photon pairs versus four-photon entangled states in parametric down conversion
Authors		de Riedmatten, Hugues Scarani, Valerio Marcikic, Ivan Acin, Antonio Tittel, Wolfgang Zbinden, Hugo Gisin, Nicolas
Published in		Journal of modern optics. 2004, vol. 51, no. 11, p. 1637-1649
Abstract		We study the physics of four-photon states generated in spontaneous parametric down-conversion with a pulsed pump field. In the limit where the coherence time of the photons t_c is much shorter than the duration of the pump pulse Delta t, the four photons can be described as two independent pairs. In the opposite limit, the four photons are in a four-particle entangled state. Any intermediate case can be characterized by a single parameter chi, which is a function of tphc/∆t. We present a direct measurement of chi through a simple experimental setup. The full theoretical analysis is also provided
Identifiers		DOI: 10.1080/09500340408232478
Full text		Article (Published version) (212 Kb) - Limited access to UNIGE
Structures		Faculté des sciences / Section de physique / Groupe de physique appliquée
Citation (ISO format)		DE RIEDMATTEN, Hugues et al. Two independent photon pairs versus four-photon entangled states in parametric down conversion. In: Journal of modern optics, 2004, vol. 51, n° 11, p. 1637-1649. doi: 10.1080/09500340408232478 https://archive-ouverte.unige.ch/unige:36738