13Two-Photon Interferometry—II: Quantum Interference of Chaotic-Thermal Light
The study of entangled states greatly advanced our understanding of two-photon interferometry. Two-photon interference is not the interference between two photons; it is about a pair of photon interfering with the pair itself. In the language of quantum theory, two-photon interference is the result of superposition between indistinguishable two-photon amplitudes. Is the concept of two-photon amplitude applicable only to the entangled states? Does two-photon interference occurr only with entangled photon pairs? The answer is negative. In this chapter, we study two-photon interference of chaotic-thermal light. Thermal light is traditionally defined as “classical” light. ...
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