Improvement of frequency standards with quantum entanglement

S.F. Huelga, C. Macchiavello, T. Pellizzari, A.K. Ekert, M.B. Plenio, J. Cirac

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    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 spec- troscopy 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.
    Original languageEnglish
    Pages (from-to)3865-68
    JournalPhysical Review Letters
    Issue number20
    Publication statusPublished - 1997


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