Motional Fock states for quantum-enhanced amplitude and phase measurements with trapped ions

Year: 2019

Authors: Wolf Fabian; Shi Chunyan; Heip Jan C.; Gessner Manuel; Pezze Luca; Smerzi Augusto; Schulte Marius; Hammerer Klemens; Schmidt Piet O.

Autors Affiliation: Phys Tech Bundesanstalt, Bundesallee 100, D-38116 Braunschweig, Germany; INO CNR, QSTAR, Largo Enrico Fermi 2, I-50125 Florence, Italy; LENS, Largo Enrico Fermi 2, I-50125 Florence, Italy; Leibniz Univ Hannover, Albert Einstein Inst, Inst Gravitat Phys, Inst Theoret Phys, Appelstr 2, D-30167 Hannover, Germany; Leibniz Univ Hannover, Inst Quantenopt, Welfengarten 1, D-30167 Hannover, Germany; PSL Univ, CNRS, Ecole Normale Super, Dept Phys, 24 Rue Lhomond, F-75005 Paris, France

Abstract: The quantum noise of the vacuum limits the achievable sensitivity of quantum sensors. In non-classical measurement schemes the noise can be reduced to overcome this limitation. However, schemes based on squeezed or Schrodinger cat states require alignment of the relative phase between the measured interaction and the non-classical quantum state. Here we present two measurement schemes on a trapped ion prepared in a motional Fock state for displacement and frequency metrology that are insensitive to this phase. The achieved statistical uncertainty is below the standard quantum limit set by quantum vacuum fluctuations, enabling applications in spectroscopy and mass measurements.


Volume: 10      Pages from: 2929-1  to: 2929-8

More Information: We acknowledge support from the DFG through CRC 1227 (DQ-mat), projects A06 and B05, and the state of Lower Saxony, Hannover, Germany. M.G. acknowledges support by the Alexander von Humboldt foundation.
DOI: 10.1038/s41467-019-10576-4

Citations: 63
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