Berlin 2014 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 11: Quantum effects: Entanglement and decoherence I

Q 11.3: Vortrag

Montag, 17. März 2014, 14:30–14:45, DO24 Reuter Saal

Quantum Darwinism and the Appearance of Classicality: A model based on Random Unitary Operations (RUO) — •Nenad Balaneskovic¹, Gernot Alber¹, and Jaroslav Novotny^1,2 — 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

We discuss characteristic properties of pure decoherence and Quantum Darwinism (QD) [1] based on qubit-models of open systems interacting with their respective environment by iterated and randomly applied controlled-NOT-type operations [2]. From the analytically determined asymptotic dynamics of the resulting quantum Markov chain the QD-appearance of Classicality and its connection to König-digraph interaction (KDI) models [3] of pure decoherence can be investigated. KDI comprise environmental qubits which do not interact among themselves by unitary quantum operations and are thus suitable to physically describe objective quantum measurements performed on an open system by autonomous observers (environmental qubits). KDI model also accounts for the most efficient storage of classical information of a system into its environment. Since the efficiency of the mentioned information storage is also connected with Zurek's concept of QD, we address physical limits of the QD-concept within our RUO approach. [1] W. H. Zurek, Nature Physics 5, 181-188 (2009). [2] Novotny, J., Alber, G., Jex, I., Phys. Rev. Lett. 107, 090501 (2011). [3] Brualdi, R.: "A Combinatorial Approach to Matrix Theory" (T&F, London, 2011).