Quantum Resonances Crossing: Quantitative Analysis in an Explicit Model

Different kinds of crossings of quantum resonances can be observed even in simple models. When there is an exact crossing of the imaginary parts of the resonances then a damped beating phenomenon for the survival amplitude occurs, which is absent if there is no such crossing. This fact suggests the possibility of designing quantum sensors to determine in a very simple way whether the strength of an external DC electric field has an assigned value or not.