Dresden 2011 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 12: Quantum Information: Concepts and Methods 2

Q 12.3: Vortrag

Montag, 14. März 2011, 15:00–15:15, SCH A118

Measures of Quantum Decoherence — •Julius Helm and Walter T. Strunz — Institut für Theoretische Physik, TU Dresden, 01062 Dresden

For practical purposes decoherence may often be well described on basis of a stochastic Hamiltonian. Yet, for systems of two qubits or more it is known that true quantum decoherence exists, that is, decoherence due to growing entanglement between the system and its quantum environment. While the former may be described using random unitary (RU) channels, there are quantum decoherence channels of which no RU representation can be found [1,2]. We study measures of the quantumness of a decoherence channel, that is, the norm distance to the convex set of random unitary channels.

[1] L. Landau and R.F. Streater, Lin. Alg. Appl. 193, 107 (1993).

[2] J. Helm and W.T. Strunz, Phys. Rev. A 80, 042108 (2009).