Mainz 2017 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 41: Quantum Information: Concepts and Methods VI

Q 41.6: Talk

Thursday, March 9, 2017, 12:30–12:45, P 2

Recovering quantum properties of continuous-variable states in the presence of measurement errors — •Evgeny Shchukin and Peter van Loock — Johannes-Gutenberg University of Mainz, Institute of Physics, Staudingerweg 7, 55128 Mainz, Germany

We present two results which combined enable one to reliably detect multimode, multipartite entanglement in the presence of measurement errors. The first result leads to a method to compute the best (approximated) physical covariance matrix given a measured non-physical one assuming that no additional information about the measurement is available except the standard deviations from the mean values. The other result states that a widely used entanglement condition is a consequence of negativity of partial transposition. Our approach can quickly verify entanglement of experimentally obtained multipartite states, which is demonstrated on several realistic examples. Compared to existing detection schemes, ours is very simple and efficient. In particular, it does not require any complicated optimizations.