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A linear triple quantum dot (TQD) integrated with a quantum dot (QD) chargesensor is realized. The TQD and the charge sensor are built from two adjacentInAs nanowires by fine finger gate technique. The charge state configurationsof the nanowire TQD are studied by measurements of the direct transport signalsof the TQD and by detection of the charge state transitions in the TQD via thenanowire QD sensor. Excellent agreements in the charge stability diagrams ofthe TQD obtained by the direct transport measurements and by the charge-statetransition detection measurements are achieved. It is shown that the chargestability diagrams are featured by three groups of charge state transitionlines of different slopes, corresponding to the changes in the electronoccupation numbers of the three individual QDs in the TQD. It is also shownthat the integrated nanowire QD sensor is highly sensitive and can detect thecharge state transitions in the cases where the direct transport signals of theTQD are too weak to be measurable. Tuning to a regime, where all the three QDsin the TQD are close to be on resonance with the Fermi level of the source anddrain reservoirs and co-existence of triple and quadruple points becomespossible, has also been demonstrated with the help of the charge sensor in theregion where the direct transport signals of the TQD are hardly visible.

Detection of charge states of an InAs nanowire triple quantum dot with an integrated nanowire charge sensor