Dresden 2011 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 11: Precision spectroscopy of atoms and ions III

A 11.6: Vortrag

Dienstag, 15. März 2011, 15:15–15:30, BAR 205

Quantum correlations in the two-photon decay of few-electron ions — •Filippo Fratini^1,2, Malte Tichy³, Thorsten Jahrsetz^1,2, Andreas Buchleitner³, Stephan Fritzsche^2,4, and Andrey Surzhykov^1,2 — ¹Physikalisches Institut, Heidelberg University, Heidelberg, Germany — ²GSI, Darmstadt, Germany — ³Physikalisches Institut, Freiburg University, Freiburg, Germany — ⁴Frankfurt Institute for Advanced Studies, Frankfurt, Germany

We present a theoretical study of the entanglement of the photon pair emitted in the decay of metastable states in hydrogen–like and helium–like ions. By using non–relativistic dipole approximation, we are able to derive analytical expressions for the (degree of) entanglement which give intuitive insights on the quantum correlation of the two emitted photons. In addition, by comparing these non–relativistic results with predictions given by the relativistic theory, we investigate relativistic and higher, non–dipole effects on the photons’ polarization states. Detailed calculations are shown for the two–photon 2s_1/2→ 1s_1/2 transition in hydrogen–like ions as well as for the 1s_1/2 2s_1/2 ¹S₀ → 1s_1/2 1s_1/2 ¹S₀, 1s_1/2 2s_1/2 ³S₁ → 1s_1/2 1s_1/2 ¹S₀ and 1s_1/2 2p_1/2 ³P₀→ 1s_1/2 1s_1/2 ¹S₀ transitions in helium–like ions.