We will discuss our recent work aimed at quantum networks with atomic ensembles, inspired by Ref. [1]. The coherent quantum state transfer from a two-level atomic system to a single photon is reported in Ref. [2]. Entanglement between a single photon (signal) and a two-component ensemble of cold rubidium atoms is used to project the quantum memory element (the atomic ensemble) onto any desired state by measuring the signal in a suitable basis. The atomic qubit is read out by stimulating directional emission of a single photon (idler) from the (entangled) collective state of the ensemble.
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