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Sökning: WFRF:(Sciarrino Fabio)

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  • Cabello, Adan, et al. (författare)
  • Hybrid ququart-encoded quantum cryptography protected by Kochen-Specker contextuality
  • 2011
  • Ingår i: Physical Review A. Atomic, Molecular, and Optical Physics. - 1050-2947 .- 1094-1622. ; 84:3, s. 030302-
  • Tidskriftsartikel (refereegranskat)abstract
    • Quantum cryptographic protocols based on complementarity are not secure against attacks in which complementarity is imitated with classical resources. The Kochen-Specker (KS) theorem provides protection against these attacks, without requiring entanglement or spatially separated composite systems. We analyze the maximum tolerated noise to guarantee the security of a KS-protected cryptographic scheme against these attacks and describe a photonic realization of this scheme using hybrid ququarts defined by the polarization and orbital angular momentum of single photons.
  • Cabello, Adan, et al. (författare)
  • Loophole-Free Bell Test Based on Local Precertification of Photon's Presence
  • 2012
  • Ingår i: PHYSICAL REVIEW X. - 2160-3308. ; 2:2, s. 021010-
  • Tidskriftsartikel (refereegranskat)abstract
    • A loophole-free violation of Bell inequalities is of fundamental importance for demonstrating quantum nonlocality and long-distance device-independent secure communication. However, transmission losses represent a fundamental limitation for photonic loophole-free Bell tests. A local precertification of the presence of the photons immediately before the local measurements may solve this problem. We show that local precertification is feasible by integrating three current technologies: (i) enhanced single-photon down-conversion to locally create a flag photon, (ii) nanowire-based superconducting single-photon detectors for a fast flag detection, and (iii) superconducting transition-edge sensors to close the detection loophole. We carry out a precise space-time analysis of the proposed scheme, showing its viability and feasibility.
  • D'Ambrosio, Vincenzo, et al. (författare)
  • Experimental Implementation of a Kochen-Specker Set of Quantum Tests
  • 2013
  • Ingår i: Physical Review X. - 2160-3308 .- 2160-3308. ; 3:1, s. 011012-
  • Tidskriftsartikel (refereegranskat)abstract
    • The conflict between classical and quantum physics can be identified through a series of yes-no tests on quantum systems, without it being necessary that these systems be in special quantum states. Kochen-Specker (KS) sets of yes-no tests have this property and provide a quantum-versus-classical advantage that is free of the initialization problem that affects some quantum computers. Here, we report the first experimental implementation of a complete KS set that consists of 18 yes-no tests on four-dimensional quantum systems and show how to use the KS set to obtain a state-independent quantum advantage. We first demonstrate the unique power of this KS set for solving a task while avoiding the problem of state initialization. Such a demonstration is done by showing that, for 28 different quantum states encoded in the orbital-angular-momentum and polarization degrees of freedom of single photons, the KS set provides an impossible-to-beat solution. In a second experiment, we generate maximally contextual quantum correlations by performing compatible sequential measurements of the polarization and path of single photons. In this case, state independence is demonstrated for 15 different initial states. Maximum contextuality and state independence follow from the fact that the sequences of measurements project any initial quantum state onto one of the KS set's eigenstates. Our results show that KS sets can be used for quantum-information processing and quantum computation and pave the way for future developments. DOI: 10.1103/PhysRevX.3.011012
  • Nagali, Eleonora, et al. (författare)
  • Experimental Observation of Impossible-to-Beat Quantum Advantage on a Hybrid Photonic System
  • 2012
  • Ingår i: Physical Review Letters. - 0031-9007 .- 1079-7114. ; 108:9, s. 090501-
  • Tidskriftsartikel (refereegranskat)abstract
    • Quantum resources outperform classical ones for certain communication and computational tasks. Remarkably, in some cases, the quantum advantage cannot be improved using hypothetical postquantum resources. A class of tasks with this property can be singled out using graph theory. Here we report the experimental observation of an impossible-to-beat quantum advantage on a four-dimensional quantum system defined by the polarization and orbital angular momentum of a single photon. The results show pristine evidence of the quantum advantage and are compatible with the maximum advantage allowed using postquantum resources.
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  • Resultat 1-4 av 4
Typ av publikation
tidskriftsartikel (4)
Typ av innehåll
refereegranskat (4)
Cabello, Adan (4)
Sciarrino, Fabio (4)
D'Ambrosio, Vincenzo (3)
Nagali, Eleonora (3)
Bourennane, Mohamed (1)
Amselem, Elias (1)
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Herbauts, Isabelle (1)
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Stockholms universitet (4)
Engelska (4)
Forskningsämne (UKÄ/SCB)
Naturvetenskap (3)


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