According to ScienceDaily, researchers at Kyoto and Hiroshima universities developed a photonic quantum circuit that efficiently identifies multi-photon W states and demonstrated it experimentally with three photons.
W states are a form of entanglement relevant to quantum communication, teleportation and network verification. Fast and efficient detection could simplify state verification and error checking in quantum networks.
Source: ScienceDaily, 13.05.2026 — https://www.sciencedaily.com/releases/2026/05/260513034640.htm