Quantum-enhanced phase estimation in the presence of loss
Rafał Demkowicz-Dobrzański, M. Kacprowicz, Wojciech Wasilewski, Konrad Banaszek, U. Dorner, Brian J. Smith, Jeff S. Lundeen, Ian A. Walmsley · 2009
The paper reports the proof-of-principle experimental quantum-enhanced phase estimation. The measurement is based on specifically designed two-photon states that maximize the amount of information about the detected phase in the presence of loss.