Coherent transfer in single photon and single electron spin coupled systems

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In this project, we have studied the coherent transfer from single photons to single electron spins in quantum dots towards constructing global quantum network and application to the quantum repeater enabling long distance communication. First, we have fabricated quantum dots using quantum well structures designed by obeying the theoretical proposal and characterized the g-factor of these quantum dots. Then, we have found that the quantum dots that satisfy the coherent transfer condition have been realized. In these quantum dots, we have demonstrated the single photoelectron detection using resonant interdot tunneling and significant improvement in the detection reliability. Moreover, by combining this single photon detection scheme to the Pauli rule in two electron system, we have successfully realized the detection of single photoelectron spin with high distinguishability more than 90%. These achievements offer great steps towards coherent transfer.