The aim of this review paper is to enlighten some recent progresses in quantum optical metrology in the part of quantum efficiency measurements of photo-detectors performed with bi-photon states. The intrinsic correlated nature of entangled photons from Spontaneous Parametric Down Conversion phenomenon has opened wide horizons to a new approach for the absolute measurement of photodetector quan...

Nash equilibria and correlated of classical quantum games are investigated in the context their Pareto efficiency. The examples prisoner’s dilemma, battle sexes game chicken studied. Correlated usually improve but require a trusted correlation device susceptible to manipulation. extension these Eisert–Wilkens–Lewenstein formalism Frąckiewicz–Pykacz parameterization is analyzed. It shown that mi...

Quantum Factoring and Search Algorithms Quantum Information Seminar Friday, Sep. 17, 1999 Ashok Muthukrishnan Rochester Center for Quantum Information (RCQI) ___________________________________________________________ § 1. Quantum Algorithm for Factorisation (1994) A. Factorising and cryptography p. 2 B. Relation of factorisation to period-finding p. 5 C. Quantum algorithm for period-finding p....

We employ a high quantum efficiency photon number counter to determine the photon number distribution of the output field from a parametric down-converter. The raw photocount data directly demonstrates that the source is nonclassical by 40 standard deviations, and correcting for the quantum efficiency yields a direct observation of oscillations in the photon number distribution.