METHOD FOR CHANGING THE POLARISATION OF AT LEAST ONE PHOTON OF THE PHOTONS WHICH ARE RADIATED FROM A PHOTON PAIR SOURCE TO FORM VARIOUS PARTIAL BEAM PATHS AND A METHOD FOR PRODUCING INDIVIDUAL PHOTONS OR PHOTON PAIRS IN AN OPTICAL CHANNEL

摘要

The invention relates to a method for changing the polarisation of at least one photon of the photons which are radiated from a photon pair source to form various partial beam paths (A1, A2). Polarisation is carried out by means of an electro-optical modulator (EOM) that is arranged in the partial beam path (A1) respectively, whereby the photon to be influenced passes through said path. Said modulator can change the polarisation of a photon when in the activated state. The modulator is timely activated in such a way that the probability of presence of the photon in the area of the electro-optical modulator being in the activated state is at a maximum.