Bistability in the Electric Current through a Quantum-Dot Capacitively Coupled to a Charge-Qubit

We investigate the electronic transport through a single-level quantum-dot which is capacitively coupled to a charge-qubit. by employing the method of nonequilibrium green's functions, we calculate the electric current through quantum dot at finite bias voltages. the green's functions and self-energies of the system are calculated perturbatively and self-consistently to the second order of interaction between the quantum-dot and the charge-qubit by employing the majorana fermion representation for isospin operators of the qubit. our results show that in the particle-hole symmetric situation, the electric current of the qd exhibits a unitary linear conductance at low bias voltage and at the higher bias voltage it has a nonlinear dependence on the bias voltage. moreover, we find that at some appropriate parameter regimes, the current through the qd as a function of gate voltage, at a fixed bias voltage shows bistability.