F. E. Becerra

TL;DR: A quantum receiver based on a novel adaptive measurement scheme and a high-bandwidth, high-detection-efficiency system for single-photon counting and an unconditionally discriminates between four nonorthogonal coherent states is presented.

TL;DR: In this paper, a quantum receiver based on photon-number-resolving detection and adaptive feedback is demonstrated, which can discriminate quadrature-phase-shift-keying coherent signals with error below the standard quantum limit.

TL;DR: It is shown that the experimental implementation of generalized quantum measurements for unambiguous discrimination of four non-orthogonal coherent states and their quantum mechanical description, the positive-operator valued measure, outperforms any ideal standard-quantum-limited measurement performing the same non-ideal unambiguous state discrimination task for coherent states with low mean photon numbers.

TL;DR: In this article, the authors present measurements of the resonance structure for nondegenerate four-wave mixing (4WM) in the diamond configuration in a warm atomic vapor of rubidium and show that a narrow sub-Doppler feature exists and can be understood as a result of velocity class selection.

TL;DR: In this article, the authors investigate experimentally and theoretically non-degenerate four-wave mixing in rubidium vapor using a diamond configuration and model the process of three classical fields interacting with a four-level atomic system with the Schrodinger equation.