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A Cr atom in a semiconductor host carries a localized spin with an intrinsiclarge spin to strain coupling particularly promising for the development ofhybrid spin-mechanical systems and coherent mechanical spin driving. Wedemonstrate here that the spin of an individual Cr atom inserted in asemiconductor quantum dot can be controlled optically. We first show that a Crspin can be prepared by resonant optical pumping. Monitoring the timedependence of the intensity of the resonant fluorescence of the quantum dotduring this process permits to probe the dynamics of the optical initializationof the Cr spin. Using this initialization and read-out technique we measured aCr spin relaxation time at T=5 K of about 2 microseconds. We finallydemonstrate that, under a resonant single mode laser field, the energy of anyspin state of an individual Cr atom can be independently tuned by using theoptical Stark effect.

Resonant optical control of the spin of a single Cr atom in a quantum dot