Multi-Photon Entanglement for Sub Shot-Noise Sensitivity
Christian Schwemmer, Roland Krischek, Witlef Wieczorek, Wiesław Laskowski, Philipp Hyllus, Luca Pezzè, Augusto Smerzi, Harald Weinfurter · Research in Optical Sciences · 2012
We experimentally demonstrate a general criterion to identify multi-photon entangled states useful for quantum metrology and prove their applicability for phase estimation with a sensitivity higher than the shot-noise limit.