Stark-interaction stabilization of the excited state of identical particles

It has been shown in the Markov approximation of the quantum stochastic differential equation approach, with decay of the symmetric W state as an example, that the collective spontaneous decay of an ensemble of identical particles can be suppressed almost completely due to the Stark interaction of the particles with the vacuum electromagnetic field, which results in stabilization of the excited state of the atomic ensemble with a certain number of particles.