03 (2012 Selected)：

Study of the initialization of an electron spin

Spins in semiconductor quantum dots are expected to be used for quantum information processing as highly integrated quantum bits in the solid state.  Long relaxation time of electron spins localized in quantum dots allows high-speed multiple quantum operations.  Electron spins in quantum dots and photons can easily exchange the quantum information in quantum communication.  In this study initialization and control of spins in quantum dots will be especially developed through coherent spin manipulation of trions in quantum dots by ultrashort light pulses.  Time-resolved Kerr rotation spectroscopy will be applied to observe coherent spin precession of electrons in quantum dots and the initialization and control of the spins will be investigated as functions of ellipticity, intensity and band width of circular or elliptic polarized light pulses.  Further highly-sensitive time-resolved Kerr rotation spectroscopy will be applied to observe coherent spin precession of a single electron in a quantum dot and the initialization and control of the spin will be demonstrated.

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