A5050224225- Quantum Information and Cryptography
- Quantum optics and atomic interactions
- Random lasers and scattering media
- Quantum Mechanics and Applications
- Laser-Matter Interactions and Applications
- Orbital Angular Momentum in Optics
- Mechanical and Optical Resonators
- Cold Atom Physics and Bose-Einstein Condensates
- Photorefractive and Nonlinear Optics
- Neural Networks and Reservoir Computing
- Photonic and Optical Devices
- Advanced Fiber Laser Technologies
- Advanced Optical Sensing Technologies
- Radiation Detection and Scintillator Technologies
- Quantum Computing Algorithms and Architecture
- Spectroscopy and Quantum Chemical Studies
- Advanced Fluorescence Microscopy Techniques
- Atomic and Subatomic Physics Research
- Optical and Acousto-Optic Technologies
- Optical Imaging and Spectroscopy Techniques
- Advanced Optical Imaging Technologies
- Advanced biosensing and bioanalysis techniques
- DNA and Nucleic Acid Chemistry
- Experimental Learning in Engineering
- Photoacoustic and Ultrasonic Imaging
University of Insubria
2006-2025
Istituto di Fotonica e Nanotecnologie
2015-2025
Center for Biomolecular Nanotechnologies
2015-2024
National Research Council
2013-2024
Czech Academy of Sciences, Institute of Physics
2020
Czech Academy of Sciences
2020
Consorzio Roma Ricerche
2017
National Interuniversity Consortium for the Physical Sciences of Matter
2007-2016
National Academies of Sciences, Engineering, and Medicine
2015-2016
University of Milan
1993-2012
We demonstrate sub-shot-noise photon-number correlations in a (temporal) multimode mesoscopic ($\ensuremath{\sim}{10}^{3}$ detected photons) twin beam produced by picosecond-pulsed spontaneous nondegenerate parametric down-conversion. have separately the signal and idler distributions of photons collected coherence areas found that variance photon-count difference goes below shot-noise limit $3.25\phantom{\rule{0.3em}{0ex}}\mathrm{dB}$. The number temporal modes contained beam, as well size...
Abstract Quantum physics (QP) education at the secondary school level is still in its infancy. Not only there ongoing discussion about how to teach this subject, but also a lack of coherence selection concepts be taught, both across countries and over time. To contribute discussion, we investigated perspectives $N= 39$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>N</mml:mi><mml:mo>=</mml:mo><mml:mn>39</mml:mn></mml:math> high teachers, university-level educators,...
Experimental reconstructions of photon number distributions both continuous-wave and pulsed light beams are reported. Our scheme is based on on/off avalanche photodetection assisted by maximum-likelihood estimation does not involve counting. Reconstructions the distribution for semiclassical quantum states reported single-mode as well multimode beams.
We address the generation of fully inseparable three-mode entangled states radiation by interlinked nonlinear interactions in χ(2) media. show how entanglement can be used to realize symmetric and asymmetric telecloning machines, which achieve optimal fidelity for coherent states. An experimental implementation involving a single crystal two take place simultaneously is suggested. Preliminary results showing feasibility effectiveness interaction scheme with seeded are also presented.
We implement a direct detection scheme based on hybrid photodetectors to experimentally investigate high-order correlations for detected photons by means of accessible quantities. The is self-consistent, allowing the estimation all involved parameters (quantum efficiency, number modes, and average energy). In particular, we show how correlation functions can be exploited fully characterize bipartite multimode states in regimes realistic quantum technology, that is, mesoscopic photon-number...
We present a description of the operation multi-pixel detector in presence non-negligible dark-count and cross-talk effects. apply model to devise self-consistent calibration strategies be performed on very light under investigation.
Stimulated by the European project “QTEdu CSA”, within flagship “Quantum Technologies”, a community of researchers active in fields quantum technologies and physics education has designed implemented an extracurricular course on concepts applications for high school. The course, which featured eight interactive lectures, was organized online between March May 2021 attended about 250 students from all over Italy. In this paper, we describe main tenets activities course. Moreover, report...
We demonstrate the possibility of a self-consistent characterization photon-number statistics light field by using photoemissive detectors with internal gain simply endowed linear input/output responses. The method can be applied to both microscopic and mesoscopic regimes. must operate in range without need for photon-counting capabilities.
Twin-beam coherence properties are analyzed in both spatial and spectral domains at high gain, including also the regime of pump depletion. We show an increase size intensity autocorrelation cross-correlation areas increasing power, replaced by a decrease depletion regime. This effect is interpreted as progressive loss mode selection occurring high-gain amplification. The experimental determination number spatiospectral modes from measurements ${g}^{(2)}$-intensity coefficient confirms this...
We address joint photodetection as a method for discriminating between the classical correlations of thermal beam divided by splitter and quantum entanglement twin obtained parametric down-conversion. show that intense beams light detection difference photocurrent may be used, in principle, order to reveal entanglement, while simple measurement correlation coefficient is not sufficient. have experimentally measured variance several states. Results are good agreement with theoretical...
We demonstrate the effect of multiple-photon subtraction on generation conditional states in pulsed regime. Our experimental scheme relies a beam splitter (BS) and pair linear photodetectors that are able to resolve up tens photons. use single-mode thermal field at input port BS test reliability our scheme, we show good agreement with theory by fully characterizing outgoing terms photon-number statistics non-Gaussianity.
We theoretically demonstrate that detectors endowed with internal gain and operated in regimes which they do not necessarily behave as photon-counters, but still ensure linear input/output responses, can allow a self-consistent characterization of the statistics number detected photons without need knowing their gain.We present experiments performed photo-emissive hybrid detector on classical fields non-trivial show method works for both microscopic mesoscopic photon numbers.The obtained...
We generate nonclassical conditional states by exploiting the quantum correlations of multi-mode twin-beam endowed with a sizeable number photons. A strong relation between sub-shot-noise exhibited twin beams and sub-Poissonian character is experimentally revealed. It determines optimal conditions for light generation.
Mesoscopic twin-beam states, which exhibit robust nonclassical correlations, hold significant potential for applications in quantum technologies, including underwater communication and metrology. As Ytterbium-based lasers delivering sub-picosecond pulses are becoming the cornerstone of ultrafast photonics, optimizing generation states light driven by such short while avoiding presence noise sources, as spurious light, is also essential. To this end, we propose an optical scheme that delivers...
We demonstrate the capability of a commercial photomultiplier to produce distinguishable anodic-pulse charge values when 1, 2, or more photoelectrons leave cathode within time shorter than pulse-response duration. propose method for precise reconstruction photoelectron statistics from measured pulse-height spectra and discuss applications characterization quantum states in continuous-variable regime.
We investigate photon statistics in the signal beam generated by frequency nondegenerate parametric downconversion both with and without a seed field along idler direction. The experiments are performed on beta-barium borate traveling-wave pump pulse that is frequency-tripled output of an amplified Nd:YLF picosecond laser. high powers obtained allow us to measure number photons simple detection technique. When fields initially their vacuum states, mixtures equally occupied modes thermal...
We demonstrate a state reconstruction technique which provides either the Wigner function or density matrix of field mode and requires only avalanche photodetectors, without any phase amplitude discrimination power. It represents an alternative to quantum homodyne tomography simpler implementation.
We measure high-order correlation functions of detected-photon numbers in the mesoscopic regime by means hybrid photodetectors. The analytical expressions for correlations are evaluated terms quantities that can be experimentally accessed a selfconsistent analysis detectors' outputs. demonstrate used to characterize nature optical states, instance better discriminating between classical and quantum behavior even critical situations, such as multimode twin-beam state. results very good...
We use hybrid photodetectors endowed with partial photon-number resolution to characterize the distribution of twin-beam states produced at different intensity regimes up pump depletion. To match detectors' dynamics, light signal and idler is strongly attenuated by neutral-density filters. Since filters do not modify nature any classical-light statistics, we find that are described a multimode thermal power. The number modes decreases increasing power until depletion, when starts again....
We propose an innovative strategy to discriminate between two coherent states affected by either uniform or gaussian phase noise. The is based on a homodyne-like detection scheme with photon-number-resolving detectors in the regime of low-intensity local oscillator. experimental implementation involves hybrid photodetectors, whose outputs are used post processing calculate shot-by-shot photon-number difference. performance this quantified terms error probability discriminating noisy signals...
Abstract Silicon Photomultipliers are potentially ideal detectors for Quantum Optics and Information studies based on mesoscopic states of light. However, their non-idealities hampered use so far. An optimal mode operation has been developed it is presented here, proving that this class sensors can actually be exploited the characterization both classical quantum properties