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Scientific article
English

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

Published inJournal of modern optics, vol. 51, no. 11, p. 1637-1649
Publication date2004
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

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
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ISSN of the journal0950-0340
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