Entanglement-preserving absorption of single SPDC photons by a single atom

Details Entanglement-preserving absorption of single SPDC photons by a single atom Entanglement-preserving absorption of single SPDC photons by a single atom

2011-11-04

arxiv.org/abs/1111.1085v1

Physics

Quantum Physics

4 pages, 3 figures

Scientific paper

We study the controlled interaction between a single trapped Ca40+ ion and single photons belonging to entangled photon pairs. The ion is prepared as a polarization-sensitive single-photon absorber; the absorption of one photon from a pair is marked by a quantum jump of the atomic state and heralded by the coincident detection of the entangled partner photon. For three polarization basis settings of absorption and detection of the herald, we find maximum coincidences always for orthogonal polarizations. Tomographic reconstruction of the biphoton quantum state from the absorption-herald coincidences reveals 93% overlap with the maximally entangled state. This proves that the polarization entanglement shared by the photon pair is preserved in the absorption process and converted to transient photon-atom entanglement.

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