Darmstadt 2008 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 56: Quanteninformation (Photonen und nichtklassisches Licht I)

Q 56.5: Vortrag

Freitag, 14. März 2008, 12:00–12:15, 1A

An entangled-pair photon source for single-photon single-atom interaction — •Albrecht Haase, Nicolas Piro, Morgan Mitchell, and Jürgen Eschner — ICFO - Institut de Ciencies Fotoniques, 08660 Castelldefels (Barcelona), Spain

We present 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 single 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. We describe the setup and characterize the performance of the source. Its applications will be experiments towards the probabilistic entanglement of distantly trapped single atoms. As a first step we employ the temporal correlation of the photon pairs to study the triggered excitation of an ion. Additionally the source provides entanglement in the polarization degree of freedom of the photons, which we have observe with over 91% visibility. We propose schemes to transfer the entanglement to the internal states of the trapped ions.