Berlin 2014 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 11: Quantum effects: Entanglement and decoherence I

Q 11.6: Vortrag

Montag, 17. März 2014, 15:15–15:30, DO24 Reuter Saal

Multipartite entanglement evolution in open quantum systems under continuous monitoring — •Carlos Viviescas — Departamento de Física, Universidad Nacional de Colombia, Carrera 30 No.45-03, Bogotá D.C., Colombia

A key lesson of the decoherence program is that information flowing out from an open system is stored in the quantum state of the surroundings. Simultaneously, quantum measurement theory shows that the evolution of any open system when its environment is measured is nonlinear and leads to pure states conditioned on the measurement record. We use this conditional evolution to establish a time evolution equations for the average entanglement in the system, avoiding the, up to now, unescapable step of solving first the evolution of the unconditional state. We show how this equations can be use to extract fundamental relations between entanglement and measurement at the level of single quantum trajectories in systems whose environment is being continuously monitored. Moreover, we show how such monitoring can be use to develop general protocols for entanglement protection using local measurements.