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In this paper we study the resolution of images illuminated by sourcescomposed of $N+1$ photons in which one non-degenerate photon is entangled with$N$ degenerate photons. The $N$ degenerate photons illuminate an object and arecollected by an $N$ photon detector. The signal from the $N$ photon detector ismeasured in coincidence with the non-degenerate photon giving rise to a ghostimage. We discuss the case of three photons in various configurations andgeneralize to $N+1$. Using the Rayleigh criterion, we find that the system maygive an improvement in resolution by a factor of $N$ compared to using aclassical source. For the case that the $N$-photon number detector is a pointdetector, a coherent image is obtained. If the $N$-photon detector is a bucketdetector, the image is incoherent. The visibility of the image in both cases is1. In the opposite case in which the non-degenerate photon is scattered by theobject, then, using an $N$-photon point detector may reduce the Airy disk by afactor of $N$.

Spatial Resolution Enhancement in Quantum Imaging beyond the Diffraction Limit Using Entangled Photon-Number State