Left panel: an extended image obtained through a classical telescope. The width of the diffraction pattern equals λ/D = 30 pixels. Middle panel: each photon produces a set of 35 clones. In the absence of a coincidence detection the angular resolution is not improved. Right panel: the average position of the 36 photon clones is kept as the signal – the angular resolution is improved by a factor 6. In this numerical simulation the contribution from spontaneous emissions is neglected. The initial high-resolution image was provided by J. Schmoll.