  We propose a nonlinear imaging scheme with undetected photons that overcomes
the diffraction limit by transferring near-field information at one wavelength
to far-field information of a correlated photon with a different wavelength
generated through spontaneous photon-pair generation. At the same time, this
scheme allows for retrieval of high-contrast images with zero background,
making it a highly sensitive scheme for imaging of small objects at challenging
spectral ranges with subdiffraction resolutions.
