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In a previous paper [B. Deb and G. S. Agarwal, Phys. Rev. A 90, 063417(2014)], it was theoretically shown that, magneto-optical manipulation of lowenergy scattering resonances and atom-molecule transitions could lead to theformation of a bound state in continuum (BIC), provided there is no spontaneousemission. We find that even an exceedingly small spontaneous decay from exitedmolecular states can spoil the BIC. In this paper, we show how to circumventthe detrimental effect of spontaneous emission by making use of vacuum-inducedcoherence (VIC) which results in the cancellation or suppression of spontaneousemission. VIC occurs due to the destructive interference between twospontaneous decay pathways. An essential condition for VIC is thenon-orthogonality of the transition dipole moments associated with the decays.Furthermore, the interference between decay pathways requires that the spacingbetween the two decaying states must be comparable to or smaller than thesquare root of the product of the two spontaneous linewidths. We demonstratethat these conditions can be fulfilled by microwave dressing of twoappropriately chosen molecular excited states, opening a promising prospect forthe experimental realization of BIC of cold atoms.

Suppressing deleterious effects of spontaneous emission in creating bound states in cold atom continuum