Physics – Quantum Physics
Scientific paper
1997-07-04
Phys.Rev.Lett. 79 (1997) 3865
Physics
Quantum Physics
4 pages, 4 figures
Scientific paper
10.1103/PhysRevLett.79.3865
The optimal precision of frequency measurements in the presence of decoherence is discussed. We analyze different preparations of n two level systems as well as different measurement 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.
Cirac Juan Ignacio
Ekert Artur K.
Huelga Susana F.
Macchiavello Chiara
Pellizzari Thomas
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