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Search Results: 1 - 10 of 144500 matches for " F. Sciarrino "
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Anomalous resilient to decoherence macroscopic quantum superpositions generated by universally covariant optimal quantum cloning
N. Spagnolo,F. Sciarrino,F. De Martini
Physics , 2010, DOI: 10.1103/PhysRevA.82.032325
Abstract: We show that the quantum states generated by universal optimal quantum cloning of a single photon represent an universal set of quantum superpositions resilient to decoherence. We adopt Bures distance as a tool to investigate the persistence ofquantum coherence of these quantum states. According to this analysis, the process of universal cloning realizes a class of quantum superpositions that exhibits a covariance property in lossy configuration over the complete set of polarization states in the Bloch sphere.
A Qubit on the Faraday Mirror
F. De Martini,F. Sciarrino,V. Secondi
Physics , 2003,
Abstract: In the context of Quantum Information (QI) the ''Faraday Mirror'' acts as a non-universal NOT Gate. As such its behaviour complies with the principles of quantum mechanics. This non trivial result, at the core of some recent misinterpretations in the QI community, has been reached by a thorough experimental investigation of the properties of the device including the adoption of modern Quantum Process Tomography. In addition, the ''universal optical compensation'' method devised by Mario Martinelli, of common use in long distance quantum-cryptography, has been fully investigated theoretically and experimentally.
Teleportation scheme implementing the Universal Optimal Quantum Cloning Machine and the Universal NOT gate
M. Ricci,F. Sciarrino,C. Sias,F. De Martini
Physics , 2003,
Abstract: The universal quantum cloning machine and the universal NOT gate acting on a single qubit can be implemented very generally by slightly modifying the protocol of quantum state teleportation. The experimental demonstration of the 1 to 2 cloning process according to the above scheme has been realized for a qubit encoded in photon polarization.
''Active'' Teleportation of a Quantum Bit
S. Giacomini,F. Sciarrino,E. Lombardi,F. De Martini
Physics , 2002, DOI: 10.1103/PhysRevA.66.030302
Abstract: We report the experimental realization of the ''active'' quantum teleportation (QST) of a one-particle entangled qubit. This demonstration completes the original QST protocol and renders it available for actual implementation in quantum computation networks. It is accomplished by implementing a 8m optical delay line and a single-photon triggered fast Electro-Optic Pockels cell. A large value of teleportation ''fidelity'' was attained: F = (90 +/- 2)%. Our work follows the line recently suggested by H. W. Lee and J. Kim, Phys. Rev. A 63, 012305 (2000) and E.Knill, R.Laflamme and G.Milburn Nature 409: 46 (2001).
Teleportation of the U-NOT Gate and Quantum Cloning: a Computational Network and Experimental Realization
F. Sciarrino,C. Sias,M. Ricci,F. De Martini
Physics , 2003, DOI: 10.1016/j.physleta.2004.01.063
Abstract: We present a computational circuit which realizes contextually the Tele-UNOT gate and the universal optimal quantum cloning machine (UOQCM). We report the experimental realization of the probabilistic UOQCM with polarization encoded qubits. This is achieved by combining on a symmetric beam-splitter the input qubit with an ancilla in a fully mixed state.
Teleportation scheme implementing contextually the Universal Optimal Quantum Cloning Machine and the Universal Not Gate. Complete experimental realization
M. Ricci,F. Sciarrino,C. Sias,F. De Martini
Physics , 2003, DOI: 10.1103/PhysRevLett.92.047901
Abstract: By a significant modification of the standard protocol of quantum state Teleportation two processes ''forbidden'' by quantum mechanics in their exact form, the Universal NOT gate and the Universal Optimal Quantum Cloning Machine, have been implemented contextually and optimally by a fully linear method. In particular, the first experimental demonstration of the Tele-UNOT Gate, a novel quantum information protocol has been reported (cfr. quant-ph/0304070). A complete experimental realization of the protocol is presented here.
Realization of Universal Optimal Quantum Machines by Projective Operators and Stochastic Maps
F. Sciarrino,C. Sias,M. Ricci,F. De Martini
Physics , 2004, DOI: 10.1103/PhysRevA.70.052305
Abstract: Optimal quantum machines can be implemented by linear projective operations. In the present work a general qubit symmetrization theory is presented by investigating the close links to the qubit purification process and to the programmable teleportation of any generic optimal anti-unitary map. In addition, the contextual realization of the N ->M cloning map and of the teleportation of the N->(M-N) universal NOT gate is analyzed by a novel and very general angular momentum theory. An extended set of experimental realizations by state symmetrization linear optical procedures is reported. These include the 1->2 cloning process, the UNOT gate and the quantum tomographic characterization of the optimal partial transpose map of polarization encoded qubits.
Experimental quantum process tomography of non trace-preserving maps
I. Bongioanni,L. Sansoni,F. Sciarrino,G. Vallone,P. Mataloni
Physics , 2010, DOI: 10.1103/PhysRevA.82.042307
Abstract: The ability of fully reconstructing quantum maps is a fundamental task of quantum information, in particular when coupling with the environment and experimental imperfections of devices are taken into account. In this context we carry out a quantum process tomography (QPT) approach for a set of non trace-preserving maps. We introduce an operator $\OO$ to characterize the state dependent probability of success for the process under investigation. We also evaluate the result of approximating the process with a trace-preserving one.
Bell Experiments with Random Destination Sources
F. Sciarrino,G. Vallone,A. Cabello,P. Mataloni
Physics , 2010, DOI: 10.1103/PhysRevA.83.032112
Abstract: It is generally assumed that sources sending randomly two particles to one or two different observers, named here random destination sources (RDS), cannot by used for genuine quantum nonlocality tests because of the postselection loophole. We demonstrate that Bell experiments not affected by the postselection loophole may be performed with: (i) RDS and local postselection using perfect detectors, (ii) RDS, local postselection, and fair sampling assumption with any detection efficiency, and (iii) RDS and a threshold detection efficiency required to avoid the detection loophole. These results allow the adoption of RDS setups, which are more simple and efficient, for long-distance free-space Bell tests, and extends the range of physical systems which can be used for loophole-free Bell tests.
Influences, Translations, Settings: An Evaluation of the Literary Relations between Ireland and Italy
Chiara Sciarrino
Studi Irlandesi : a Journal of Irish Studies , 2011,
Abstract: The text is an attempt to draw conclusions about the literary relations between Italy and Ireland. Taking as its starting point a booklet published by the Italian Cultural Institute Dublin in 1964, the study surveys the influences of Pirandello and Dante in Ireland and analyses in detail translations of Italian poems made by Denis Devlin, Gerald Dawe, Tom Paulin, Derek Mahon, Paul Muldoon, Eiléan Ní Chuilleanáin, Harry Clifton and Desmond O’Grady (their authors: Ungaretti, Quasimodo, Montale, Leopardi). Next, it deals with the ways Italian artistic heritage and natural beauties have been re-interpreted by Irish travelers, according special attention to Elizabeth Bowen’s work. The following sections investigate the relationship between Italian visual arts and music and Anglo-Irish Literature, exploring in particular Frank McGuinness’ Caravaggio, Tom Murphys’ The Gigli Concert and Jim Nolan’s The Salvage Shop. The final part of the essay is dedicated to the role Italian migrants play in Irish narrative.
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