Hannover 2016 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 3: Quantum Information: Concepts and Methods I
Q 3.4: Vortrag
Montag, 29. Februar 2016, 11:45–12:00, e214
Quantifying the clumsiness in a Leggett-Garg test — •Giuseppe Vitagliano1, Costantino Budroni2, Giorgio Colangelo3, and Morgan W. Mitchell3,4 — 1Department of Theoretical Physics, University of the Basque Country UPV/EHU, P.O. Box 644, E-48080 Bilbao, Spain — 2Naturwissenschaftlich-Technische Fakultat, Universitat Siegen, Walter-Flex-Str. 3, D-57068 Siegen, Germany — 3ICFO -- Institut de Ciencies Fotoniques, Av. Carl Friedrich Gauss, 3, 08860 Castelldefels, Barcelona, Spain — 4ICREA -- Institucio' Catalana de Recerca i Estudis Avancats, 08015 Barcelona, Spain
Leggett-Garg tests aim to witness macroscopic quantum coherence effects through the violation of an inequality involving correlations among measurements, at different instants of time, of a macroscopic quantity. However, clumsy measurements are able to violate a Leggett-Garg inequality even in absence of genuine quantum effects. We formalise the notion of clumsiness in a Leggett-Garg test and, starting from the simplest examples, we provide a general recipe for computing the clumsiness parameter in any LG test. Finally, we analyse in detail the clumsiness parameter of a recent proposal for a Leggett-Garg test on atomic ensembles via simulations with realistic experimental parameters.