Fig. 5
From: Unveiling the bosonic nature of an ultrashort few-electron pulse
A QPC as a fast switch. a Operation diagram of our fast QPC switch. Initially we apply a negative DC voltage (VDC) on the QPC to set it deep into the pinch-off regime. Then we apply a fast pulse on the QPC, VAC, and gradually shift the DC voltage to higher values. By carefully choosing the right VDC we can open the QPC for a very short time, ~10 ps. b Time-resolved measurement of the electron pulse. The dark points are measurements and the continuous line is a Gaussian fit. The FWHM of the electron pulse is 68 ps
