Partial Coherence and Entanglement
Bahaa E. A. Saleh, Malvin Carl Teich, Alexander V. Sergienko · 2004
The two-photon wave function that characterizes light in a two-photon entangled state obeys equations similar to the Wolf equations describing the mutual coherence function. A duality between coherence and entanglement has been established, and a van Cittert-Zernike theorem is applicable. Intensity correlation is described by a Siegert-type relation that is devoid of the deleterious background term.