Inhibition of collective spontaneous decay and superradiance in an ensemble of sufficiently high quantity of excited identical atoms

New effects of suppression of the collective spontaneous emission and superradiance have been predicted. At a certain number N of ensemble atoms, the Stark interaction with a vacuum field was shown as being high enough for the excited N-atom ensemble to be stabilized with respect to the collective decay. The result was derived analytically as a consequence of applying the quantum stochastic differential equations to the description of the atomic dynamics in vacuum, where the Stark interaction operator is expressed in terms of the quantum Poisson process.

► Enhancement of the Stark interaction of N atoms ensemble with vacuum, with N rising. ► Representation of the Stark interaction as the quantum Poisson process. ► Collective spontaneous decay and superradiance under the strong Stark interaction. ► Inhibition of superradiance at a certain number of ensemble atoms. ► Analysis of superradiance experiments in terms of inhibition of collective decay.