1967/07/25 by R. L. Pfleegor, L. Mandeļ · 9 citations
Physics and Astronomy · Computer Science · #Orbital Angular Momentum in Optics #Quantum Information and Cryptography #Quantum optics and atomic interactions
paper · doi:10.1103/physrev.159.1084
openalex publication_date 1967/07/25 · openalex created_date 2025/10/10 · openalex updated_date 2026/06/26
Interference effects produced by the superposition of the light beams from two independent single-mode lasers have been investigated experimentally. It is found that interference takes place even under conditions in which the light intensities are so low that, with high probability, one photon is absorbed before the next one is emitted by one or the other source. Since the average number of registered photons per trial was only about 10, photon correlation techniques were required to demonstrate the interference. The interpretation of the experiment, and the question whether it demonstrates interference between two photons, are discussed.