Düsseldorf 2007 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 18: Quanteninformation (Verschränkung und Dekohärenz I)

Q 18.2: Vortrag

Dienstag, 20. März 2007, 11:00–11:15, 5L

Experimental detection of SLOCC invariants — •Andreas Osterloh¹ and Jens Siewert² — ¹Institut für Theoretische Physik, Universität Hannover, D-30167 Hannover, Germany — ²Institut für Theoretische Physik, Universität Regensburg, D-93040 Regensburg, Germany

Characterization and quantification of multipartite entanglement is a crucial task for state-of-the-art experiments in quantum information processing, and also in modern condensed-matter physics. According to theory, this is established by entanglement monotones, that is, functions that do not increase under stochastic local operations and classical communication (SLOCC). However, typically such functions are expressed in terms of expectation values of antilinear operators, and therefore are not directly accessible in an experiment. Here we show how such monotones can be re-written in terms of expectation values of (linear) hermitian operators. That is, the amount of entanglement – of specific SLOCC classes – in a given state can be extracted from the measurement of correlation functions of local operators.