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. 2016 Jan 29;2(1):e1501054. doi: 10.1126/sciadv.1501054

Fig. 1. Apparatus to control the propagation of photon pairs through an MMF.

Fig. 1

Photon pairs from a SPDC source (not shown) are injected in a graded-index MMF (50-μm core diameter) with orthogonal polarizations. Two SLMs (SLM H and SLM V) are used to shape the transverse spatial waveform of each photon. Output light is monitored by an EMCCD camera and two PMSMFs, F1 and F2, connected to APDs all imaging the output plane of the MMF. A half-wave plate and a PBS positioned just after the MMF permit selection of one specific polarization of the output field.