Luis Aina, Alfredo2023-06-202023-06-202009-09-021050-294710.1103/PhysRevA.80.034101https://hdl.handle.net/20.500.14352/44645©2009 The American Physical Society. This work was supported by Project No. FIS2008-01267 of the Spanish Direccion General de Investigacion del Ministerio de Ciencia e Innovacion.We estimate the quantum state of a system between two measurements via a maximum likelihood strategy. This incorporates all the information provided by preselection and postselection in a legitimate quantum state. Moreover, it allows to include any other constraint derived from practical considerations.engjournal articlehttp://dx.doi.org/10.1103/PhysRevA.80.034101http://journals.aps.org/open access535Quantized radiation-fieldQuantum-mechanicsTimeRealizationSystemsÓptica (Física)2209.19 Óptica Física