Entanglement Enabled Intensity Interferometry of different wavelengths of light

Jordan Cotler, Frank Wilczek, Victoria Borish

Research output: Contribution to journalArticlepeer-review

3 Scopus citations


We propose methods to perform intensity interferometry of photons having two different wavelengths. Distinguishable particles typically cannot interfere with each other, but we overcome that obstacle by processing the particles via entanglement and projection so that they lead to the same final state at the detection apparatus. Specifically, we discuss how quasi-phase-matched nonlinear crystals can be used to convert a quantum superposition of light of different wavelengths onto a common wavelength, while preserving the phase information essential for their meaningful interference. We thereby gain access to a host of new observables, which can probe subtle frequency correlations and entanglement. Further, we generalize the van Cittert–Zernike formula for the intensity interferometry of extended sources, demonstrate how our proposal supports enhanced resolution of sources with different spectral character, and suggest potential applications.

Original languageEnglish (US)
Article number168346
JournalAnnals of Physics
StatePublished - Jan 2021

ASJC Scopus subject areas

  • General Physics and Astronomy


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