We present the design and set-up of a narrow-bandwidth source of entangled photon pairs, which will allow us to address the transitions D3/2-P3/2 and D5/2-P3/2 in 40Ca+ ions at 850 and 854 nm wavelength, respectively. The source has been designed to emit photons with a high spectral power density into the absorption window of the Calcium ions, which has a bandwidth of ～20 MHz. The design has been chosen such that the produced photon rate and the output bandwidth can be varied independently, to be adapted to the experimental needs. Its application will be an experiment that studies methods of probabilistic entanglement of distantly trapped single atoms. A first step will be to employ the temporal correlation between the emitted photons for a triggered excitation of an ion. Additionally the source provides entanglement in the polarization degree of freedom of the photons, which will be used in future experiments to study the possibility of directly transferring entanglement between photon and ion pairs [1].
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