Abstract
Abstract : Optical control is fundamental to our project objective of demonstration of key quantum operations for quantum computation with spin qubits of electrons in semiconductor quantum dots. Sophia Economou, the graduate student supported by this fellowship, works on the design of optical control taking into account the deterioration of the quantum states of the electron spin and of the excited state during the optical control process. She has three major accomplishments: (1) She and collaborators predicted how spontaneously generated spin coherence by optical excitation affects the spin precession, which was experimentally confirmed. (2) She and collaborators constructed a unified theory of the quantum dynamics of any three level system under a wide range of control and measurement scenarios and under environmental influence, applicable to solid state and atomic systems. (3) She designed and simulated a simple sequence of three pulses to initialize, rotate and inverse-rotate an electron spin qubit.
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