2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/92294In this work we first derive a generalized conditional master equation for quantum measurement by a mesoscopic detector, then study the readout characteristics of qubit measurement where a number of new features are found. The work would in particular highlight the qubit spontaneous relaxation effect induced by the measurement itself rather than an external thermal bath.4 pages, 2 figures; an error in Eq.(8) is correctedQuantum Physicstext