Physics – Quantum Physics
Scientific paper
2008-04-15
New J. Phys. 10 (2008) 113012
Physics
Quantum Physics
12 pages, 5 figures.Comparison between theoretical model and previous experiment was added. One new figure, and two more refer
Scientific paper
10.1088/1367-2630/10/11/113012
In most configurations aimed at generating entangled photons based on spontaneous parametric down conversion (SPDC), the generated pairs of photons are required to be entangled in only one degree of freedom. Any distinguishing information coming from the other degrees of freedom that characterize the photon should be suppressed to avoid correlations with the degree of freedom of interest. However, this suppression is not always possible. Here, we show how the frequency information available affects the purity of the two-photon state in space, revealing a correlation between the frequency and the space degrees of freedom. This correlation should be taken into account to calculate the total amount of entanglement between the photons.
Osorio Clara I.
Torres Juan P.
Valencia Alejandra
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