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We propose methods to perform intensity interferometry of photons having twodifferent wavelengths. Distinguishable particles typically cannot interferewith each other, but we overcome that obstacle by processing the particles viaentanglement and projection so that they lead to the same final state at thedetection apparatus. Specifically, we discuss how quasi-phase-matched nonlinearcrystals can be used to convert a quantum superposition of light of differentwavelengths onto a common wavelength, while preserving the phase informationessential for their meaningful interference. We thereby gain access to a hostof new observables, which can probe subtle frequency correlations andentanglement. Further, we generalize the van Cittert-Zernike formula for theintensity interferometry of extended sources, demonstrate how our proposalsupports enhanced resolution of sources with different spectral character, andsuggest potential applications.

Entanglement Enabled Intensity Interferometry of Different Wavelengths of Light