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Search Results: 1 - 10 of 661 matches for " Ivano Ruo Berchera "
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Experimental Quantum Imaging exploiting multi-mode spatial correlation of twin beams
Giorgio Brida,Marco Genovese,Alice Meda,Ivano Ruo Berchera
Physics , 2010, DOI: 10.1103/PhysRevA.83.033811
Abstract: Properties of quantum states have disclosed new and revolutionary technologies, ranging from quantum information to quantum imaging. This last field is addressed to overcome limits of classical imaging by exploiting specific properties of quantum states of light. One of the most interesting proposed scheme exploits spatial quantum correlations between twin beams for realizing sub-shot-noise imaging of the weak absorbing objects, leading ideally to a noise-free imaging. Here we discuss in detail the experimental realization of this scheme, showing its capability to reach a larger signal to noise ratio with respect to classical imaging methods and, therefore, its interest for future practical applications.
Analysis of the possibility of analog detectors calibration by exploiting Stimulated Parametric Down Conversion
Giorgio Brida,Maria Chekhova,Marco Genovese,Ivano Ruo-Berchera
Physics , 2008, DOI: 10.1364/OE.16.012550
Abstract: Spontaneous parametric down conversion (SPDC) has been largely exploited as a tool for absolute calibration of photon-counting detectors, i.e detectors registering very small photon fluxes. In [J. Opt. Soc. Am. B 23, 2185 (2006)] we derived a method for absolute calibration of analog detectors using SPDC emission at higher photon fluxes, where the beam is seen as a continuum by the detector. Nevertheless intrinsic limitations appear when high-gain regime of SPDC is required to reach even larger photon fluxes. Here we show that stimulated parametric down conversion allow one to avoid this limitation, since stimulated photon fluxes are increased by the presence of the seed beam.
Absolute Calibration of Analog Detectors by using Parametric Down Conversion
Giorgio Brida,Maria Chekhova,Marco Genovese,Alexander Penin,Maria Luisa Rastello,Ivano Ruo-Berchera
Physics , 2007,
Abstract: In this paper we report our systematic study of a promising absolute calibration technique of analog photo-detectors, based on the properties of parametric down conversion. Our formal results and a preliminary uncertainty analysis show that the proposed method can be effectively developed with interesting applications to metrology.
Detection of multimode spatial correlation in PDC and application to the absolute calibration of a CCD camera
Giorgio Brida,Ivo Pietro Degiovanni,Marco Genovese,Maria Luisa Rastello,Ivano Ruo-Berchera
Physics , 2010, DOI: 10.1364/OE.18.020572
Abstract: We propose and demonstrate experimentally a new method based on the spatial entanglement for the absolute calibration of analog detector. 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 preliminary evaluation of the statistical uncertainty indicates the metrological interest of the method.
Experimental tests of hidden variable theories from dBB to Stochastic Electrodynamics
Giorgio Brida,Marco Genovese,Marco Gramegna,Fabrizio Piacentini,Enrico Predazzi,Ivano Ruo-Berchera
Physics , 2006, DOI: 10.1088/1742-6596/67/1/012047
Abstract: In this paper we present some of our experimental results on testing hidden variable theories, which range from Bell inequalities measurements to a conclusive test of stochastic electrodynamics.
Measurement of sub-shot-noise spatial correlations without subtraction of background
Giorgio Brida,Lucia Caspani,Alessandra Gatti,Marco Genovese,Alice Meda,Ivano Ruo Berchera
Physics , 2008, DOI: 10.1103/PhysRevLett.102.213602
Abstract: In this paper we present the first measurement of sub-shot-noise spatial correlations without any subtraction of background, a result opening the way to realize sub-shot-noise imaging of weak objects
The possibility of absolute calibration of analog detectors by using parametric down-conversion: a systematical study
Giorgio Brida,Maria Chekhova,Marco Genovese,Alexander Penin,Ivano Ruo-Berchera
Physics , 2005, DOI: 10.1364/JOSAB.23.002185
Abstract: Accurate calibration of photodetectors both in analog and in photon-counting regime is fundamental for various scientific applications, which range from "traditional" quantum optics to the studies on foundations of quantum mechanics, quantum cryptography, quantum computation, etc. In this paper we systematically study the possibility of the absolute calibration of analog photo-detectors based on the properties of parametric amplifiers. Our results show that such a method can be effectively developed with interesting possible metrological applications.
Quantifying the source of enhancement in experimental continuous variable quantum illumination
Sammy Ragy,Ivano Ruo Berchera,Ivo P. Degiovanni,Stefano Olivares,Matteo G. A. Paris,Gerardo Adesso,Marco Genovese
Physics , 2014, DOI: 10.1364/JOSAB.31.002045
Abstract: A quantum illumination protocol exploits correlated light beams to enhance the probability of detection of a partially reflecting object lying in a very noisy background. Recently a simple photon-number-detection based implementation of a quantum illumination-like scheme has been provided in [Lopaeva {\it et al,}, Phys. Rev. Lett. {\bf 101}, 153603 (2013)] where the enhancement is preserved despite the loss of non-classicality. In the present paper we investigate the source for quantum advantage in that realization. We introduce an effective two-mode description of the light sources and analyze the mutual information as quantifier of total correlations in the effective two-mode picture. In the relevant regime of a highly thermalized background, we find that the improvement in the signal-to-noise ratio achieved by the entangled sources over the unentangled thermal ones amounts exactly to the ratio of the effective mutual informations of the corresponding sources. More precisely, both quantities tend to a common limit specified by the squared ratio of the respective cross-correlations. A thorough analysis of the experimental data confirms this theoretical result.
Experimental realization of sub-shot-noise quantum imaging
G. Brida,M. Genovese,I. Ruo Berchera
Physics , 2010, DOI: 10.1038/NPHOTON.2010.29
Abstract: Properties of quantum states have disclosed new technologies, ranging from quantum information to quantum metrology. Among them a recent research field is quantum imaging, addressed to overcome limits of classical imaging by exploiting spatial properties of quantum states of light . In particular quantum correlations between twin beams represent a fundamental resource for these studies. One of the most interesting proposed scheme exploits spatial quantum correlations between parametric down conversion light beams for realizing sub-shot-noise imaging of the weak absorbing objects, leading ideally to a noise-free imaging. Here we present the first experimental realisation of this scheme, showing its capability to reach a larger signal to noise ratio (SNR) with respect to classical imaging methods. This work represents the starting point of this quantum technology that can have relevant applications, especially whenever there is a need of a low photon flux illumination (e.g. as with certain biological samples).
Testing Quantum Gravity by Quantum Light
I. Ruo Berchera,I. P. Degiovanni,S. Olivares,M. Genovese
Physics , 2013, DOI: 10.1103/PhysRevLett.110.213601
Abstract: In the last years quantum correlations received large attention as key ingredient in advanced quantum metrology protocols, in this letter we show that they provide even larger advantages when considering multiple-interferometer setups. In particular we demonstrate that the use of quantum correlated light beams in coupled interferometers leads to substantial advantages with respect to classical light, up to a noise-free scenario for the ideal lossless case. On the one hand, our results prompt the possibility of testing quantum gravity in experimental configurations affordable in current quantum optics laboratories and strongly improve the precision in "larger size experiments" such as the Fermilab holometer; on the other hand, they pave the way for future applications to high precision measurements and quantum metrology.
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