Physics – Quantum Physics
Scientific paper
2003-10-28
J.Mod.Opt. 51, 1637 (2004)
Physics
Quantum Physics
10 pages, 3 figures, submitted
Scientific paper
10.1080/09500340408232478
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 t_c/Delta t. We present a direct measurement of chi through a simple experimental setup. The full theoretical analysis is also provided.
Acin Antonio
Gisin Nicolas
Marcikic Ivan
Riedmatten Hugues de
Scarani Valerio
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