Fig. 1
From: Unveiling the bosonic nature of an ultrashort few-electron pulse
Device and time-of-flight measurements. a Schematic of the quantum device. A few-electron pulse is launched at the left ohmic contact (black crossed box) by applying a very short (≈70 ps) voltage pulse. Three QPCs, denoted as QPC1, QPC2 and QPC3, are placed along the quantum device at a distance of 15, 30 and 70 μm from the left ohmic contact. Each of these three QPCs is connected to a large bandwidth (40 GHz) bias tee and operated as an ultrafast switch. Time-resolved detection of current is done at the right ohmic contact. QPC0, placed a distance of 6 μm from the left ohmic contact, is used as a channel selection. b Time-resolved measurements of an electron pulse at the three different QPC positions. c Illustration of the sample geometry used for the self-consistent calculations. The quasi one-dimensional quantum wire is defined by the two long electrostatic gates at potential VSG. The coloured images, one at the beginning of the wire and another one at the end, are cross-sections of the electron density profile along the y-axis as a function of the gate voltage. d Time-resolved measurements of an electron pulse at QPC3 for different excitation amplitudes. The amount of electrons contained in the electron pulse is varied between 0.6 e and 6.1 e
