Ou Raadsaal declared a Provincial Heritage Site and is protected in terms of Section 34 of the National Heritage Resources Act (Act 25 of 1999), as it is over 60 years old. The building is also known in English as the Old Council Chamber or Old Government Building, and in Afrikaans as the Republikeinse Raadsaal. Ou Raadsaal The Ou Raadsaal (English: "Old Council Hall") is a historic building in Pretoria, South Africa, located on the south side of Church Square. The Ou Raadsaal housed the Volksraad, the parliament of the South African Republic, from 1891 to 1902. The Ou Raadsaal was commissioned
Hong–Ou–Mandel effect dip is related to the states of the two photons formula_14 and formula_15 as If formula_17, then the visibility is equal to the purity formula_18 of the photons. In 2006, an experiment was performed in which two atoms independently emitted a single photon each. These photons subsequently produced the Hong–Ou–Mandel effect. The Hong–Ou–Mandel effect also underlies the basic entangling mechanism in linear optical quantum computing, and the two-photon quantum state formula_19 that leads to the HOM dip is the simplest non-trivial state in a class called NOON states. In 2015 the Hong–Ou–Mandel effect for photons was directly observed with spatial