- Conference date: 16-21 July 2006
- Location: Innsbruck (Austria)
Entangled states of atoms prepared in a decoherence‐free subspace are shown to be useful for precision spectroscopy. Energy level shifts can be measured by using a pair of atoms in a Bell state for performing phase‐estimation by generalized Ramsey experiments. The immunity of decoherence‐free subspaces against certain sources of noise allows for long excitation times in the presence of noise that would render single‐atom experiments impossible. We employ this technique for a measurement of the electric quadrupole moment Θ of the meta‐stable 3D 5/2 level of 40Ca+ which is found to be .
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