One-Dimensional\nQuantum Dot Array Integrated with\nCharge Sensors in an InAs Nanowire

We\nreport an experimental study of a 1D quintuple-quantum-dot\narray\nintegrated with two charge sensors in an InAs nanowire. The device\nis studied by measuring double quantum dots formed consecutively in\nthe array, and corresponding charge stability diagrams are revealed\nwith both direct current measurements and charge sensor signals. The\none-dimensional quintuple-quantum-dot array is then tuned up, and\nits charge configurations are fully mapped out with the two charge\nsensors. The energy level of each dot in the array can be controlled\nindividually using virtual gates. After that, four dots in the array\nare selected to form two double quantum dots, and ultrastrong inter-double-dot\ninteraction is obtained. A theoretical simulation confirms the strong\ncoupling strength between the two double quantum dots. The highly\ncontrollable one-dimensional quantum dot array is expected to be valuable\nfor employing InAs nanowires to construct advanced quantum hardware\nin the future.