Fringe contrast as a function of trap laser detuning from the transition to b3Π (v'=0) for state combinations and Ramsey times (i) 1/sqrt(2)(|0>+|1>) , T = 20 ms; (ii) 1/sqrt(2)(|0>+|1>) , T = 30 ms; and (iii) 1/sqrt(2)(|1>+|2>) , T = 30 ms. Results for combination (iv) 1/sqrt(2)(|0>+|2>) are shown for Ramsey times of T = 40 ms (empty circles) and T = 175 ms (filled circles). The lines show Gaussian fits to each of the results to identify the magic detuning.
