Mainz 2017 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 19: Precision Measurements and Metrology: Interferometry II (with Q)
A 19.6: Vortrag
Dienstag, 7. März 2017, 15:45–16:00, P 104
Fock state metrology — •Fabian Wolf1, Chunyan Shi1, Jan Christoph Heip1, Marius Schulte3, Klemens Hammerer3, and Piet O. Schmidt1,2 — 1Physikalisch-Technische Bundesanstalt, 38116 Braunschweig, Germany — 2Institut für Quantenoptik, Leibniz Universität, 30167 Hannover, Germany — 3Institute for Theoretical Physics, Leibniz Universität, 30167 Hannover, Germany
The field of quantum metrology promises measurements with unprecedented accuracies and sensitivities using non-classical states. The idea behind quantum metrology is to prepare the investigated system or the measurement probe in a quantum states to reduce certain types of noise. In particular shot noise or quantum projection noise represents the major limitation for stability in state-of-the-art precision experiments ranging from gravitational wave detection to optical atomic clocks. The most prominent examples for states with non-classical features, previously investigated for this purpose are Schrödinger cat states and squeezed states and metrological gain compared to classical states has been demonstrated. Recently, investigations started to focus on the properties of states with negative Wigner function. However, so far the metrological gain of these states has not been verified experimentally. Here, we demonstrate that force measurements on an ion, trapped in a linear Paul trap can beat the classical limit, if the ion is initially prepared in a motional Fock state. Our scheme does not include any entanglement or squeezing and therefore illustrates the power of quantum interference due to negative Wigner functions for quantum metrology.