  Based on tight-binding model and a generalized Green's function method in
Landauer-B\"uttiker formalism, the effects of quantum interference (QI) on the
noise power and Fano factor of an armchair graphene nanoribbon (aGNR)
sandwiched between infinite single wall carbon nanotube (SWCNT) as a
CNT/aGNR/CNT system are numerically investigated. In this work, changing the
aGNR to CNT electrodes contact positions and applying the magnetic field as two
sources of QI are considered. We have found different Fano-resonance and
anti-resonance peaks on the transmission probability in the presence of QI
sources that show profound effects on the current-voltage characteristics and
noise power. Our results also show that the shot noise characteristic, either
in the Poisson limit ($F=1$) or sub-Poisson limit ($F<1$), and also maximum
value of the Fano factor strongly depend on the aGNR to CNT electrodes contact
positions and the magnetic field strength. These results can be useful for
designing the future nano-electronic devices.
