Distribution multi-utilisateur de paires de photons intriqués aux longueurs d'onde des télécommunications

Abstract : In order to progress towards a quantum communication network, it is vital to limit the necessary resources. In particular, we show here that we can use a single source of entangled photons pairs, to serve a large number of users. This implies that the considered source has to be spectrally broadband, and compatible with the current optical telecommunications’ infrastructure. At first, we studied a correlated photon source, based on SPDC. From the experimental values measured (counts and coincidences), an upper bound of the visibility that can be achieved in entanglement is calculated as well as the source brightness. A quality factor is established in order to compare and rank the demultiplexers tested in relation to the compromise between the quality of the quantum correlations and the source brightness.We then characterized a source of polarization entangled photon pairs. The entanglement is obtained by performing a double pumping path in a crystal of PPLN, generating a state Φ> =(1/√2)(|HH> +|VV>) . The generated photon pairs are split by using the same demultiplexers. Measurements of visibilities and the Bell parameter S are performed. The performances of the demultiplexers are compared to those obtained with the twin photons.We show that it is possible with a single source, to establish a quantum communication channel with at least 3 couples of users simultaneously. We propose at the end of this study, various methods of improvement.
Keywords : Demultiplexing
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Joe Ghalbouni. Distribution multi-utilisateur de paires de photons intriqués aux longueurs d'onde des télécommunications. Optique / photonique. Télécom ParisTech, 2013. Français. ⟨NNT : 2013ENST0068⟩. ⟨tel-01308998⟩

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