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Tools for quantum information: work at INRIM on characterization of quantum optical states, communication channels, and photo-detectors

In this paper we will present some of the work performed at INRIM on the application of quantum optical states to quantum information and metrology. In particular we will consider some specific tools needed for quantum information researches as the characterization of the quantum optical states, communication lines and detectors. In little more detail, after a general presentation of the activity of our lab, we will describe a series of experiments where we have reconstructed the statistics of various quantum optical states with an innovative method based on a "variable" quantum efficiency of detectors. The success of the presented applications and the simplicity of the method suggest a possible widespread applicability of it. We will then describe our work on photo-detectors calibration by exploiting PDC light and in particular the extension to analog detectors. Finally, we will mention some research in progress on the effects of the communication line (fiber, open air) on the transmitted quantum state.