Extended Data Fig. 4: Single-atom detection fidelity.
From: Observation of Cooper pairs in a mesoscopic two-dimensional Fermi gas
The raw images are analysed by first applying a low-pass filter followed by a simple peak-detection algorithm. A histogram of the amplitudes of all detected peaks in 2,000 images of a single spin component is plotted. We find a bimodal distribution. The maximum at low amplitudes originates from background noise of the camera. The second maximum at higher amplitudes is due to real photon clusters on the chip. Every peak with an amplitude above the threshold (vertical black line) is counted as an atom. This leads to single-atom detection fidelities of 97.8(9)%. There is a probability of 5.0(5)% for a false positive detection of an atom on each image for our chosen region of interest of 320 × 320 px. For 6 + 6 atoms this leads to a rate of false-to-true detections of 0.83(10)%. The solid red and blue lines are Gaussian and exponential fits to the data, respectively, and the dashed line is their sum.
