Key points are not available for this paper at this time.
Atoms prepared in a coherent superposition of a ground- (or excited-) state doublet can produce a large resonant index of refraction with vanishing absorption.Received 25 April 1991DOI:https://doi.org/10.1103/PhysRevLett.67.1855©1991 American Physical Society
Marlan O. Scully (Mon,) studied this question.