A recent study published in Optica Quantum explores the behavior of quantum interference when using coherent photon sources based on quantum emitters. Researchers investigated how photon-number coherence, a state where emitted single photons exist in superposition with the vacuum, affects standard quantum protocols. The study provides key insights into how this coherence influences Hong-Ou-Mandel interference, causing notable shifts in photon indistinguishability measurements and introducing new levels of entanglement in partial measurements. These findings have significant implications for improving quantum computing gates and quantum communication protocols by tailoring photon interactions for better fidelity and efficiency in quantum information processing. [Full article]
