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Coherent superpositions of the 49s and 48s Rydberg states of cold Rb atomswere studied near the surface of an atom chip. The superpositions were createdand manipulated using microwaves resonant with the two-photon 49s-48stransition. Coherent behavior was observed using Rabi flopping, Ramseysequences, spin-echo and spin-locking. These results are discussed in thecontext of Rydberg atoms as electric field noise sensors. We consider thecoherence of systems quadratically coupled to noise fields with 1/f^k powerspectral densities (k \approx 1).

Coherent manipulation of cold Rydberg atoms near the surface of an atom chip