Berlin 2005 – wissenschaftliches Programm

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Q: Quantenoptik und Photonik

Q 3: Poster Quanteninformation, -kommunikation und Quantencomputer

Q 3.3: Poster

Freitag, 4. März 2005, 11:00–12:30, Poster HU

Entanglement studies on the photoionization of few–electron ions — •Thomas Radtke, Andrey Surzhykov, and Stephan Fritzsche — Institut für Physik, Universität Kassel, D–34132, Germany

The phenomenon of entanglement is known to play a key role in quantum computation and quantum cryptography and, hence, has been studied intensively during recent years [1–3]. Special attention in these studies was placed, in particular, on the physical processes which may be utilized for the observation and manipulating of the quantum entanglement. One of such processes, which was recently discussed by Kim and co–workers [3], is the ionization of a few–electron atoms (or ions) by circularly polarized light. However, while some of the general features of the entanglement change in atomic photoionization were shown in Ref. [3], no systematic investigation on the (quantum) information transfer from the incoming photons to the emitted photoelectrons has been performed until now. In this contribution, Dirac’s approach is applied to study the photoionization of few–electron ions within both, the nonrelativistic and relativistic framework. Detailed calculations show the dependence of the entanglement change as a function of the energy and the polarization of incoming light, the nuclear charge and the emission angle of the photoelectrons.

[1] C. H. Bennett et al., Phys. Rev. Lett. 70 (1993) 1895.

[2] N. Chandra et al., J. Phys. B: At. Mol. Opt. Phys. 35 (2002) 2219.

[3] Y. S. Kim et al., Phys. Scr. T110 (2004) 79.