Evaluation of g-factor by quantum transport measurement for photon-spin quantum state transfer

One of key devices for quantum repeater system is a quantum interface that enables quantum state transfer (QST) from a messenger photon qubit to a processor electron spin qubit. To realize QST, it is necessary to fabricate a quantum dot, whose electron g-factor should be tuned to zero and to measure the local g-factor of single electron precisely without disturbing the state. We have measured the random telegraph signals (RTS) to investigate a g-factor of the quantum dot which is naturally created by a defect in the vicinity of source-drain channel. We have succeeded to detect single electron charge trapping and releasing events electrically and to measure magnetic-field dependent Zeeman shift.