Spatial Correlations and Angular Schmidt Modes in Spontaneous Parametric Down-Conversion

Details Spatial Correlations and Angular Schmidt Modes in Spontaneous Parametric Down-Conversion Spatial Correlations and Angular Schmidt Modes in Spontaneous Parametric Down-Conversion

2011-12-16

arxiv.org/abs/1112.3806v1

Physics

Quantum Physics

11 pages, 16 figures; submitted to EPJ D special issue on high dimensional entanglement

Scientific paper

We report an experimental approach to entanglement characterization in high-dimensional quantum systems using Schmidt decomposition techniques. A particular experiment uses spatial degrees of freedom of biphotons. We present a technique to realize projective measurements in Schmidt basis, allowing us to measure the coefficients in Schmidt decomposition and to estimate the degree of entanglement directly. Issues of modeling the spatial part of biphoton amplitude with simple double-gaussian functions are discussed and shown to be in good agreement with experimental results.

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