Entanglement enhanced quantum sensing
Witlef Wieczorek, Roland Krischek, Nikolai Kiesel, Ch. Schmid, Harald Weinfurter · Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE · 2010
Entanglement between quantum objects can be used to enhance the sensitivity of measurements. We demonstrate this effect by using entangled multi-photon states to go beyond the shot noise limit when observing polarization rotations.