Quantum preservation of the measurements precision using ultra-short strong pulses in exact analytical solution
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Various schemes have been proposed to improve the parameterestimation precision. In the present work, we suggest an alternative method to preserve the estimation precision by considering a model that closely describes a realistic experimental scenario. We explore this active way to control and enhance the measurements precision for a twolevel quantum system interacting with classical electromagnetic field using ultrashort strong pulses with an exact analytical solution, i.e. beyond the rotating wave approximation. In particular, we investigate the variation of the precision with a few cycles pulse and a smooth phase jump over a finite time interval. We show that by acting on the shape of the phase transient and other parameters of the considered system, the amount of information may be increased and has smaller decay rate in the long time. These features make twolevel systems incorporated in ultrashort, ofresonant and gradually changing phase good candidates for implementation of schemes for the quantum computation and the coherent information processing.