Eliminating Spectral Distinguishability in Ultrafast Spontaneous Parametric Down-conversion

Details Eliminating Spectral Distinguishability in Ultrafast Spontaneous Parametric Down-conversion Eliminating Spectral Distinguishability in Ultrafast Spontaneous Parametric Down-conversion

2009-05-23

arxiv.org/abs/0905.3849v1

Phys. Rev. A 80, 043815 (2009)

Physics

Quantum Physics

6 pages, 7 figures

Scientific paper

10.1103/PhysRevA.80.043815

Generation of polarization-entangled photon pairs with a precise timing through down-conversion of femtosecond pulses is often faced with a degraded polarization entanglement quality. In a previous experiment we have shown that this degradation is induced by spectral distinguishability between the two decay paths, in accordance with theoretical predictions. Here, we present an experimental study of the spectral compensation scheme proposed and first implemented by Kim et al. in 2002. By measuring the joint spectral properties of the polarization correlations of the photon pairs, we show that the spectral distinguishability between the down-converted components is eliminated. This scheme results in a visibility of 97.9+/-0.5% in the polarization basis without any spectral filtering.

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