Quantum Correlation Photonics in Semiconductor Macroatoms with Ballistic Phonon Waves

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The purpose of this research project is to demonstrate spatially-distinguishable spin qubits in ordered semiconductor macro-atoms. The specific research subjects as follows: (1) Initialization, rotation and observation for spins (2) Transport of excitons with ballistic phonon waves (3) Fabricate highly-tailorable macro-atoms. First, we have achieved spin initialization using the polarization pumping method and polarization anisotropy in charged excitons in single macroatoms. Next, we have accomplished the spin rotation of arbitral direction utilizing an electron spin transport technique by ballistic phonon waves. No external magnetic fields were employed, which are completely different from previous conventional methods. We have also fabricated InP/InAs hetero-nanowires having very sharp heterointerfaces. Moreover, we have developed a technique to create high-purity nanowires with an original self-catalyst method.