2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/90787We propose a scheme for the quantum nondemolition (QND) measurement of a single electron spin in a single quantum dot (QD). Analytical expressions are obtained for the optical Faraday effect between a quantum dot exciton and microcavity field. The feasibility of the QND measurement of a single electron spin is discussed for a GaAs/AlAs microcavity with an InAs QD.6 pages, 6 figuresQuantum Physicstext