Luis Aina, AlfredoSánchez Soto, Luis Lorenzo2023-06-202023-06-201998-041050-294710.1103/PhysRevA.57.3105https://hdl.handle.net/20.500.14352/59703© 1998 The American Physical SocietyWe find the observables that-can be determined by two practical schemes based on atom-field resonant interaction. In the first example, the interaction is followed by photon-number and atomic-population measurements. In the second scheme the directly measured quantity is the atomic deflection. In particular, we show that they provide the measurement of the atom-field relative phase. When the initial field state is known, the atomic density matrix can be reconstructed.engjournal articlehttp://dx.doi.org/10.1103/PhysRevA.57.3105http://journals.aps.org/open access535Quantum nondemolition measurementPhase-sensitive detectionJaynes-cummings modelBeam deflectionProbability-distributionsPhoton statistics2-level atomCavityLightStateÓptica (Física)2209.19 Óptica Física