Konstanz 1998 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe
Q: Quantenoptik
Q 37: Poster IIi: Symposium Quantenkommunikation
Q 37.1: Poster
Mittwoch, 18. März 1998, 16:00–18:00, PF
On the Improvement of Frequency Standards using Quantum Entanglement — •M. B. Plenio1, S. F. Huelga2, C. Macchiavello2, T. Pellizzari2, A. Ekert2, and J. I. Cirac3 — 1Optics Section, The Blackett Laboratory, Imperial College, London SW7 2BZ, UK — 2Clarendon Laboratory, Department of Physics, University of Oxford, UK — 3Institut für Theoretische Physik, Universität Innsbruck, 6020 Innsbruck, Austria
The optimal precision of frequency measurements in the presence of decoherence is discussed. We analyse different preparations of n two-level systems as well as different measurements procedures. We show that standard Ramsey spectroscopy on uncorrelated atoms and optimal measurements on maximally entangled states provide the same resolution. The best resolution is achieved using partially entangled preparations with a high degree of symmetry. We also present possible error correction schemes to reduce the impact of decoherence on the ions in a frequency standard.