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The Kondo effect and the Fano-Kondo effect are important phenomena that havebeen observed in quantum dots (QDs). We theoretically investigate the transportproperties of a coupled QD system in order to study the possibility ofdetecting a qubit state from the modulation of the conductance peak in theKondo effect and the dip in the Fano-Kondo effect. We show that the peak anddip of the conductance are both shifted depending on the energy-level of thequbit. In particular, we find that we can estimate the optimal point andtunneling coupling between the |0> and |1> states of the qubit by measuring theshift of the positions of the conductance peak and dip, as functions of theapplied gate voltage on the qubit and the distance between the qubit and thedetector.

Detection of a charged two-level system by using the Kondo and the Fano-Kondo effects in quantum dots