Coherent population trapping (CPT) versus electromagnetically induced transparency (EIT) Sumanta Khan, Molahalli Panidhara Kumar, Vineet Bharti and Vasant Natarajan Eur. Phys. J. D, 71 2 (2017) 38 Published online: 16 February 2017 DOI: 10.1140/epjd/e2017-70676-x