The photon sheds light on the quantum: Fluctuations and correlations tell the story

摘要

Quantum optics began with the photon-photon correlation interferometry experiment of Hanbury-Brown and Twiss which involves thermal light. The quantum eraser combines entangled light with photon-photon correlations yielding the first entanglement interferometer. In particular, the availability and/or erasure of information in one point in space-time affects is discussed.