Manipulating electron spin is one of the central problems in the growing field of semiconductor spintronics. This is of critical importance for quantum computing and information processing. Here I discuss the “optical initialization” and “optical read out” of the spin of an electron localized in a quantum dot . We suggest using the combined effects of -optical pulses and transverse magnetic field for the optical pumping of the electron spin in QDs and the initialization of single spin Q-bit. The calculation shows that ~100% spin polarization can be reached as a result of several repetitions of this procedure. For “read out” of the single electron spin we suggest using a resonance fluorescence of trions excited resonantly by circularly polarized light, which was shown to suppress the electron spin relaxation. Generation of short intensive magnetic pulses is a difficult technical problem and recently the successful dynamic electric field manipulation of electron spin was demonstrated by Kato et al . The authors used modulation of the electron g-tensor in the parabolic quantum well by an electric field. I will discuss a different mechanism of gate-voltage induced spin resonance based on the electron’s orbital motion and the standard mechanism of spin-orbit coupling .
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