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Search Results: 1 - 10 of 540305 matches for " M. L. Rastello "
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A Modified Wigner's Inequality for Secure Quantum Key Distribution
S. Castelletto,I. P. Degiovanni,M. L. Rastello
Physics , 2003, DOI: 10.1103/PhysRevA.67.044303
Abstract: In this report we discuss the insecurity with present implementations of the Ekert protocol for quantum-key distribution based on the Wigner Inequality. We propose a modified version of this inequality which guarantees safe quantum-key distribution.
Quantum and Classical Noise in Practical Quantum Cryptography Systems based on polarization-entangled photons
S. Castelletto,I. P. Degiovanni,M. L. Rastello
Physics , 2002, DOI: 10.1103/PhysRevA.67.022305
Abstract: Quantum-cryptography key distribution (QCKD) experiments have been recently reported using polarization-entangled photons. However, in any practical realization, quantum systems suffer from either unwanted or induced interactions with the environment and the quantum measurement system, showing up as quantum and, ultimately, statistical noise. In this paper, we investigate how ideal polarization entanglement in spontaneous parametric downconversion (SPDC) suffers quantum noise in its practical implementation as a secure quantum system, yielding errors in the transmitted bit sequence. Because all SPDC-based QCKD schemes rely on the measurement of coincidence to assert the bit transmission between the two parties, we bundle up the overall quantum and statistical noise in an exhaustive model to calculate the accidental coincidences. This model predicts the quantum-bit error rate and the sifted key and allows comparisons between different security criteria of the hitherto proposed QCKD protocols, resulting in an objective assessment of performances and advantages of different systems.
Experimental realization of a measurement conditional unitary operation at single photon level and application to detector characterization
M. Genovese,G. Brida,M. Chekhova,M. Gramegna,L. Krivitsky,S. Kulik,M. L. Rastello
Physics , 2004, DOI: 10.1117/12.561416
Abstract: Our last experimental results on the realization of a measurement-conditional unitary operation at single photon level are presented. This gate operates by rotating by $90^o$ the polarization of a photon produced by means of Type-II Parametric Down Conversion conditional to a polarization measurement on the correlated photon. We then propose a new scheme for measuring the quantum efficiency of a single photon detection apparatus by using this set-up. We present experimental results obtained with this scheme compared with {\it traditional} biphoton calibration. Our results show the interesting potentiality of the suggested scheme.
Absolute calibration of Analog Detectors using Stimulated Parametric Down Conversion
G. Brida,M. Chekhova,M. Genovese,M. L. Rastello,I. Ruo-Berchera
Physics , 2008, DOI: 10.1080/09500340802318317
Abstract: Spontaneous parametric down conversion has been largely exploited as a tool for absolute calibration of photon counting detectors, photomultiplier tubes or avalanche photodiodes working in Geiger regime. In this work we investigate the extension of this technique from very low photon flux of photon counting regime to the absolute calibration of analog photodetectors at higher photon flux. Moving toward higher photon rate, i.e. at high gain regime, with the spontaneous parametric down conversion shows intrinsic limitations of the method, while the stimulated parametric down conversion process, where a seed beam properly injected into the crystal in order to increase the photon generation rate in the conjugate arm, allows us to work around this problem. A preliminary uncertainty budget is discussed.
Experimental Eavesdropping Attack against Ekert's Protocol based on Wigner's Inequality
F. A. Bovino,A. M. Colla,G. Castagnoli,S. Castelletto,I. P. Degiovanni,M. L. Rastello
Physics , 2003, DOI: 10.1103/PhysRevA.68.034309
Abstract: We experimentally implemented an eavesdropping attack against the Ekert protocol for quantum key distribution based on the Wigner inequality. We demonstrate a serious lack of security of this protocol when the eavesdropper gains total control of the source. In addition we tested a modified Wigner inequality which should guarantee a secure quantum key distribution.
Recent experiments performed at "Carlo Novero" lab at INRIM on Quantum Information and Foundations of Quantum Mechanics
G. Brida,N. Antonietti,M. Gramegna,L. Krivitsky,F. Piacentini,M. L. Rastello,I. Ruo Berchera,P. Traina,M. Genovese
Physics , 2007,
Abstract: In this paper we present some recent work performed at "Carlo Novero" lab on Quantum Information and Foundations of Quantum Mechanics.
Reply to Comment on "Quantum dense key distribution"
I. P. Degiovanni,I. Ruo Berchera,S. Castelletto,M. L. Rastello,F. A. Bovino,A. M. Colla,G. Castagnoli
Physics , 2004, DOI: 10.1103/PhysRevA.71.016302
Abstract: In this Reply we propose a modified security proof of the Quantum Dense Key Distribution protocol detecting also the eavesdropping attack proposed by Wojcik in his Comment.
Quantum dense key distribution
I. P. Degiovanni,I. Ruo Berchera,S. Castelletto,M. L. Rastello,F. A. Bovino,A. M. Colla,G. Castagnoli
Physics , 2003, DOI: 10.1103/PhysRevA.69.032310
Abstract: This paper proposes a new protocol for quantum dense key distribution. This protocol embeds the benefits of a quantum dense coding and a quantum key distribution and is able to generate shared secret keys four times more efficiently than BB84 one. We hereinafter prove the security of this scheme against individual eavesdropping attacks, and we present preliminary experimental results, showing its feasibility.
Comment on "Compositional and Microchemical Evidence of Piezonuclear Fission Reactions in Rock Specimens Subjected to Compression Tests" [Strain 47 (Suppl. 2), 282 (2011)]
G. Amato,G. Bertotti,O. Bottauscio,G. Crotti,F. Fiorillo,G. Mana,M. L. Rastello,P. Tavella,F. Vinai
Physics , 2012,
Abstract: It is shown that the chemical composition data published by Carpinteri et al. in the article "Compositional and Microchemical Evidence of Piezonuclear Fission Reactions in Rock Specimens Subjected to Compression Tests" [Strain 47 (Suppl. 2), 282 (2011)] cannot be the result of independent measurements as claimed by the authors. Therefore, no conclusion can be drawn from them about compositional modifications induced in the stone by hypothetical piezonuclear reactions taking place during catastrophic failure of the material at fracture.
Self consistent, absolute calibration technique for photon number resolving detectors
A. Avella,G. Brida,I. P. Degiovanni,M. Genovese,M. Gramegna,L. Lolli,E. Monticone,C. Portesi,M. Rajteri,M. L. Rastello,E. Taralli,P. Traina,M. White
Physics , 2011, DOI: 10.1364/OE.19.023249
Abstract: Well characterized photon number resolving detectors are a requirement for many applications ranging from quantum information and quantum metrology to the foundations of quantum mechanics. This prompts the necessity for reliable calibration techniques at the single photon level. In this paper we propose an innovative absolute calibration technique for photon number resolving detectors, using a pulsed heralded photon source based on parametric down conversion. The technique, being absolute, does not require reference standards and is independent upon the performances of the heralding detector. The method provides the results of quantum efficiency for the heralded detector as a function of detected photon numbers. Furthermore, we prove its validity by performing the calibration of a Transition Edge Sensor based detector, a real photon number resolving detector that has recently demonstrated its effectiveness in various quantum information protocols.
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