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I analyze a metrological strategy for improving the precision of frequencyestimation via Ramsey interferometry with strings of atoms in the presence ofcorrelated dephasing. This strategy does not employ entangled states, butrather a product state which evolves into a stationary state under theinfluence of correlated dephasing. It is shown that by using this state animprovement in precision compared to standard Ramsey interferometry can begained. This improvement is not an improvement in scaling, i.e. the estimationprecision has the same scaling with the number of atoms as the standard quantumlimit, but an improvement proportional to the free evolution time in the Ramseyinterferometer. Since a stationary state is used, this evolution time can besubstantially larger than in standard Ramsey interferometry which is limited bythe coherence time of the atoms.

Noise assisted Ramsey interferometry