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Q: Fachverband Quantenoptik und Photonik

Q 46: Quantum information: Concepts and methods IV

Q 46.3: Vortrag

Donnerstag, 21. März 2013, 11:30–11:45, E 001

Multipartite entanglement and high precision metrology — •Géza Tóth — Theoretical Physics, University of the Basque Country UPV/EHU, E-48080 Bilbao, Spain — IKERBASQUE, Basque Foundation for Science, E-48011 Bilbao, Spain — Wigner Research Center for Physics, H-1525 Budapest, Hungary

We present several entanglement criteria in terms of the quantum Fisher information that help to relate various forms of multipartite entanglement to the sensitivity of phase estimation. We show that genuine multipartite entanglement is necessary to reach the maximum sensitivity in some very general metrological tasks using a two-arm linear interferometer. We also show that it is needed to reach the maximum average sensitivity in a certain combination of such metrological tasks.