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Q: Fachverband Quantenoptik und Photonik

Q 11: Quantum Information: Atoms and Ions 1

Q 11.3: Vortrag

Montag, 14. März 2011, 15:15–15:30, BAR Schön

Entanglement-preserving absorption of single photons by a single atom — •Michael Schug², Jan Huwer^1,2, Joyee Ghosh^1,2, Nicolas Piro¹, Marc Almendros¹, Felix Rohde¹, Carsten Schuck¹, Francois Dubin¹, and Jürgen Eschner^1,2 — ¹ICFO - Institut de Ciences Fotoniques, Mediterranean Technology Park, 08860 Castelldefels (Barcelona), Spain — ²Universität des Saarlandes, Experimentalphysik, Campus E2.6, 66123 Saarbrücken

We observe the absorption of single down-conversion photons by a single ⁴⁰Ca⁺ ion, heralded by the detection of the partner photons. A photon absorption event induces a quantum jump in the ion, detected as a sudden change in its fluorescence rate. The correlation function of the quantum jumps and the arrival times of the partner photons reveals the coincidence between the two events [1]. Additionally, we observe that the polarization entanglement of the photons is preserved in the absoprtion process. This shows the potential of the method as a tool in quantum optical information technology.
N.Piro et al., DOI: 10.1038/NPHYS1805