Workshop on QUANTUM MEASUREMENTS AND OPERATIONS FOR CRIPTOGRAPHY AND INFORMATION PROCESSING
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Quantum Measurements and Operations for Criptography and Information Processing
Review of recent experimental studies on Foundations
of Quantum Mechanics and Quantum Information at “Carlo Novero”
lab at IENGF
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aula dottorato - GIOVedì 3 FEBBRAIO ore 15.30 |
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MARCO GENOVESE , IENGF |
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PRESENTATION:
• Born in Turin (Italy) Nov. 17 1967
• "laurea" degree 1990
(University of Turin)
• PhD 1994 (University of Turin)
• Worked at CERN (Geneva) 1994-1995,
Lyon University (FR) 1995-1996, Grenoble University
• 1996-1998, IENGF since 1998
• Actually permanent researcher at
IENGF
He has published more than 50 papers on international scientific journals.
Today his activity concerns foundations of quantum mechanics and quantum
information.
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Abstract |
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In this talk I will review some recent experimental progresses
concerning Foundations of Quantum Mechanics and Quantum Information obtained
in our Quantum Optics laboratory at IENGF.
More in details, after a short presentation of the lab “Carlo Novero”,
I will present the results of an experiment where a conditioned unitary
transformation (90° polarization rotation) is performed at single-photon
level. The transformation is realized by rotating polarization for one of
the photons of a polarization-entangled biphoton state (signal photon) by
means of a Pockel's cell triggered by the detection of the other (idler)
photon after polarization selection. As a result, polarization degree for
the signal beam changes from zero to the value given by the idler detector
quantum efficiency.
This scheme finds various applications to quantum communication protocols,
furthermore it can also be used for developing a new method of absolute
quantum efficiency calibration. We present a comparison of the results obtained
with this scheme and with traditional calibration of photodetectors with
biphotons.
I will then discuss an experiment where entanglement in type II PDC emission
is restored by propagation in fiber, namely the effect of “deterioration”
of wave packet in fiber propagation is used for re-establishing indistinguishability
and entanglement.
Furthermore, I will hint at a recent experiment addressed to clarify the
issue of which wave-particle observables are really to be considered when
discussing wave particle duality. It realises a theoretical proposal of
Agarwal et al., overcoming limitations of a former experiment.
Finally, I will rapidly sketch a set-up under realisation for codification
in 4 dimensional Hilbert space. |
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