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Photon-based quantum information schemes have increased the need for light sources that produce individual photons, with many such schemes relying on optical parametric down-conversion (PDC). Practical realizations of this technology require that the PDC light be collected into a single spatial mode defined by an optical fibre. In this paper, we present two… (More)

- Alan Migdall, Stefania Castelletto, Ivo Pietro Degiovanni, Maria Luisa Rastello
- Applied optics
- 2002

We report on the absolute calibration of photodetector quantum efficiency by using correlated photon sources, performed independently at two laboratories, the National Institute of Standards and Technology and the Istituto Elettrotecnico Nazionale (IEN). The goal is to use an interlaboratory comparison to demonstrate the inherent absoluteness of the photon… (More)

- E D Lopaeva, I Ruo Berchera, I P Degiovanni, S Olivares, G Brida, M Genovese
- Physical review letters
- 2013

We present the first experimental realization of the quantum illumination protocol proposed by Lloyd [Science 321, 1463 (2008)] and S. Tan et al. [Phys. Rev. Lett. 101, 253601 (2008)], achieved in a simple feasible experimental scheme based on photon-number correlations. A main achievement of our result is the demonstration of a strong robustness of the… (More)

- G Brida, L Ciavarella, +6 authors S V Polyakov
- Physical review letters
- 2012

A quantum measurement can be described by a set of matrices, one for each possible outcome, which represents the positive operator-valued measure (POVM) of the sensor. Efficient protocols of POVM extraction for arbitrary sensors are required. We present the first experimental POVM reconstruction that takes explicit advantage of a quantum resource, i.e.,… (More)

- Giorgio Brida, Ivo Pietro Degiovanni, Marco Genovese, Valentina Schettini, Sergey V Polyakov, Alan Migdall
- Optics express
- 2008

In a recent paper [R. Alicki and N. Van Ryn, J. Phys. A: Math. Theor., 41, 062001 (2008)] a test of nonclassicality for a single qubit was proposed. Here, we discuss the class of hidden variables theories to which this test applies and present an experimental realization.

- D Gatto Monticone, K Katamadze, +7 authors M Genovese
- Physical review letters
- 2014

We experimentally demonstrate quantum enhanced resolution in confocal fluorescence microscopy exploiting the nonclassical photon statistics of single nitrogen-vacancy color centers in diamond. By developing a general model of superresolution based on the direct sampling of the kth-order autocorrelation function of the photoluminescence signal, we show the… (More)

- Giorgio Brida, Ivo Pietro Degiovanni, Marco Genovese, Maria Luisa Rastello, Ivano Ruo-Berchera
- Optics express
- 2010

We propose and demonstrate experimentally a new method based on the spatial entanglement for the absolute calibration of analog detectors. The idea consists on measuring the sub-shot-noise intensity correlation between two branches of parametric down conversion, containing many pairwise correlated spatial modes. We calibrate a scientific CCD camera and a… (More)

- A Avella, I Ruo-Berchera, I P Degiovanni, G Brida, M Genovese
- Optics letters
- 2016

We show how the same setup and procedure, exploiting spatially multimode quantum correlations, allows the absolute calibration of an electron-multiplying charge-coupled (EMCCD) camera from the analog regime down to the single-photon-counting level, just by adjusting the brightness of the quantum source. At the single-photon level, an EMCCD can be operated… (More)

- F Piacentini, M P Levi, +6 authors M Genovese
- Optics letters
- 2015

Here we present a reconstruction of the positive operator-value measurement of a photon-number-resolving detector comprised of three 50∶50 beam-splitters in a tree configuration, terminated with four single-photon avalanche detectors. The four detectors' outputs are processed by an electronic board that discriminates detected photon number states from 0 to… (More)

- F A Bovino, G Castagnoli, I P Degiovanni, S Castelletto
- Physical review letters
- 2004

We implemented the experiment proposed by Cabello in the preceding Letter to test the bounds of quantum correlation. As expected from the theory we found that, for certain choices of local observables, Tsirelson's bound of the Clauser-Horne-Shimony-Holt inequality (2 x square root of 2) is not reached by any quantum states.