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We propose a method to read-out the spin-state of an electron in a quantumdot in a Voigt geometry magnetic field using cycling transitions induced by theAC Stark effect. We show that cycling transitions can be made possible by ared-detuned, circularly-polarized laser, which modifies the spin eigenstatesand polarization selection rules via the AC Stark effect. A Floquet-Liouvillesupermatrix approach is used to calculate the time-evolution of the densitymatrix under the experimental conditions of a spin read-out operation. With anoverall detection efficiency of 2.5%, the read-out is a single-shot measurementwith a fidelity of 76.2%.

An Optical Spin Read-out Method for a Quantum Dot using the AC Stark Effect