Unconditional Shot-noise-limit Violation in Photonic Quantum Metrology
Geoff J. Pryde, Sergei Slussarenko, Morgan M. Weston, Helen M. Chrzanowski, Lynden K. Shalm, Varun Boehm Verma, Sae Woo Nam · 2018
We demonstrate the first unconditional violation of the shot noise limit in photonic NOON-state interferometry. Using ultrahigh-efficiency source and detectors we outperform ideal classical measurement without employing postselection, or correction for loss and imperfections.