On the Improvement of Frequency Stardards with Quantum Entanglement

Details On the Improvement of Frequency Stardards with Quantum Entanglement On the Improvement of Frequency Stardards with Quantum Entanglement

1997-07-04

arxiv.org/abs/quant-ph/9707014v1

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.

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