Uw. Rathe et Mo. Scully, THEORETICAL BASIS FOR A NEW SUBNATURAL SPECTROSCOPY VIA CORRELATION INTERFEROMETRY, letters in mathematical physics, 34(3), 1995, pp. 297-307
A new line-narrowing effect in coincidence interferometry yielding sub
natural resolution of atomic transition frequencies is proposed and an
alyzed. The approach utilizes second-order photon correlation properti
es of the radiation field. This is in contrast to the first-order meas
urements associated with time delay spectroscopy, which is known to yi
eld subnatural resolution. Connections between the two techniques are
investigated.