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Image resolution of quantum imaging with undetected photons is governed bythe spatial correlations existing between the photons of a photon pair that hasbeen generated in a nonlinear process. These correlations allow for obtainingan image of an object with light that never interacted with that object.Depending on the imaging configuration, either position or momentumcorrelations are exploited. We hereby experimentally analyse how the crystallength and pump waist affect the image resolution when using positioncorrelations of photons that have been generated via spontaneous parametricdown conversion in a nonlinear interferometer. Our results support existingtheoretical models for the dependency of the resolution on the crystal length.In addition, we probe the resolution of our quantum imaging scheme for varyingpump waists over one order of magnitude. This analysis reveals the intricatedependency of the resolution on the strength of the correlations within thebiphoton states for parameter combinations in which the crystal lengths aremuch larger than the involved photon wavelengths. We extend the existing modelsin this parameter regime to properly take nontrivial effects of finite pumpwaists into account and demonstrate that they match the experimental results.

Experimental analysis on image resolution of quantum imaging with undetected light through position correlations