The quantum optical description of three experiments involving non-linear optics using a graphical method

Abstract

In this paper we describe and thoroughly discuss three reported experiments in quantum optics (QO) involving interferometers and non-linear crystals. We show that by using a graphical method and an over-simplified model of the parametric down-conversion process, we arrive to explain all the important results reported in the respective papers. Indistinguishability is discussed in the case of separable/non-separable (i.e. entangled) quantum systems and our interpretation is sometimes at variance with the one given by the authors reporting the experiments.

arXiv comment6 pages, 6 figures

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• Quantum Imaging with Undetected Photons
• Quantum Mechanical Interaction-Free Measurements
• A double-slit quantum eraser
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