Experimental security analysis a four-photon private state
Krzysztof Dobek, Michał Karpiński, Rafał Demkowicz-Dobrzański, Konrad Banaszek, Paweł Horodecki · 2011
We report experimental generation of a noisy entangled four-photon state that exhibits a separation between secure key contents and distillable entanglement. This difference is exposed by a detailed analysis of its privacy properties.