Stuttgart 2012 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 54: Poster 3
Q 54.75: Poster
Donnerstag, 15. März 2012, 16:30–19:00, Poster.I+II
Asymptotic Long-Time Properties of Decoherence and Quantum Darwinism — •Nenad Balaneskovic1, Gernot Alber1, and Jaroslav Novotny1, 2 — 1Institut für Angewandte Physik, Technische Universität Darmstadt, D-64289 Darmstadt, Germany — 2Department of Physics, FNSPE, Czech Technical University in Prague, 115 19 Praha 1 - Stare Mesto, Czech Republic
Decoherence plays a crucial role in understanding the mechanism of emergence of the classical world from quantum mechanics and offers numerous interesting applications in the course of quantum information processing as well as other areas of quantum information science, ranging from error correction to storage of information. Different decoherence models provide several perspectives on the destruction of entanglement and shed new light on einselection of preferred pointer states of open systems due to their interaction with environments [1].
In this contribution we discuss characteristic properties of decoherence and quantum Darwinism based on qubit-models of open systems [2] which interact with their respective environment by iterated and randomly applied controlled-NOT-type operations. The asymptotic dynamics of the resulting quantum Markov chain is determined analytically [3]. From this asymptotic dynamics characteristic features of quantum Darwinism including its connection to decoherence-induced loss of entanglement of open quantum systems can be investigated.
[1] W. H. Zurek, Nature Physics 5, 181-188 (2009). [2] W. H. Zurek, Phys. Rev. A 71, 052105 (2005). [3] Novotny, J., Alber, G., Jex, I., Phys. Rev. Lett. 107, 090501 (2011).