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Search Results: 1 - 10 of 219610 matches for " C. Macchiavello "
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Teoría de la escalera térmica
Macchiavello C,Marco Aurelio;
Revista chilena de infectología , 2009, DOI: 10.4067/S0716-10182009000500015
Abstract: in this article we raise the possibility of a potential relationship between body temperature of different spe-cies of animáis and the avian flu. we hypothesize that the different valúes of body temperature could act as an enabling mechanism for influenza virus infection through an adaptative mechanism of the virions in the species susceptible to infection, including human beings.
Teoría de la escalera térmica Thermic stairways theory
Marco Aurelio Macchiavello C
Revista chilena de infectología , 2009,
Abstract: En el presente artículo se plantea una posible relación entre la temperatura corporal de diferentes especies animales y la presentación de la Gripe aviar. Se postula que los diferentes valores de temperatura corporal podrían actuar como un mecanismo favorecedor de las infecciones por virus Influenza, mediante un mecanismo de tipo ad-aptativo de los viriones en las diversas especies animales susceptibles a la infección, incluyendo al humano. In this article we raise the possibility of a potential relationship between body temperature of different spe-cies of animáis and the Avian Flu. We hypothesize that the different valúes of body temperature could act as an enabling mechanism for Influenza virus infection through an adaptative mechanism of the virions in the species susceptible to infection, including human beings.
Against Quantum Noise
A. Ekert,C. Macchiavello
Physics , 1999,
Abstract: This is a brief description of how to protect quantum states from dissipation and decoherence that arise due to uncontrolled interactions with the environment. We discuss recoherence and stabilisation of quantum states based on two techniques known as "symmetrisation" and "quantum error correction". We illustrate our considerations with the most popular quantum-optical model of the system-environment interaction, commonly used to describe spontaneous emission, and show the benefits of quantum error correction in this case.
Error Correction in Quantum Communication
A. Ekert,C. Macchiavello
Physics , 1996,
Abstract: We show how procedures which can correct phase and amplitude errors can be directly applied to correct errors due to quantum entanglement. We specify general criteria for quantum error correction, introduce quantum versions of the Hamming and the Gilbert-Varshamov bounds and comment on the practical implementation of quantum codes.
On the entanglement structure in quantum cloning
D. Bruss,C. Macchiavello
Physics , 2002,
Abstract: We study the entanglement properties of the output state of a universal cloning machine. We analyse in particular bipartite and tripartite entanglement of the clones, and discuss the ``classical limit'' of infinitely many output copies.
Optimal state estimation for d-dimensional quantum systems
D. Bruss,C. Macchiavello
Physics , 1998, DOI: 10.1016/S0375-9601(99)00099-7
Abstract: We establish a connection between optimal quantum cloning and optimal state estimation for d-dimensional quantum systems. In this way we derive an upper limit on the fidelity of state estimation for d-dimensional pure quantum states and, furthermore, for generalized inputs supported on the symmetric subspace.
Optimal eavesdropping in cryptography with three-dimensional quantum states
D. Bruss,C. Macchiavello
Physics , 2001, DOI: 10.1103/PhysRevLett.88.127901
Abstract: We study optimal eavesdropping in quantum cryptography with three-dimensional systems, and show that this scheme is more secure than protocols using two-dimensional states. We generalize the according eavesdropping transformation to arbitrary dimensions, and discuss the connection with optimal quantum cloning.
Multipartite entanglement in quantum algorithms
D. Bru?,C. Macchiavello
Physics , 2010, DOI: 10.1103/PhysRevA.83.052313
Abstract: We investigate the entanglement features of the quantum states employed in quantum algorithms. In particular, we analyse the multipartite entanglement properties in the Deutsch-Jozsa, Grover and Simon algorithms. Our results show that for these algorithms most instances involve multipartite entanglement.
Comment on "Loss-error compensation in quantum-state measurements"
G. M. D'Ariano,C. Macchiavello
Physics , 1997, DOI: 10.1103/PhysRevA.57.3131
Abstract: In the two papers [T. Kiss, U. Herzog, and U. Leonhardt, Phys. Rev. A 52, 2433 (1995); U. Herzog, Phys. Rev. A 53, 1245 (1996)] with titles similar to the one given above, the authors assert that in some cases it is possible to compensate a quantum efficiency $\eta\leq 1/2$ in quantum-state measurements, violating the lower bound 1/2 proved in a preceding paper [G. M. D'Ariano, U. Leonhardt and H. Paul, Phys. Rev. A 52, R1801 (1995)]. Here we re-establish the bound as unsurpassable for homodyning any quantum state, and show how the proposed loss-compensation method would always fail in a real measurement outside the allowed $\eta >1/2$ region.
Optimal phase covariant cloning for qubits and qutrits
G. M. D'Ariano,C. Macchiavello
Physics , 2003, DOI: 10.1103/PhysRevA.67.042306
Abstract: We consider cloning transformations of equatorial qubits and qutrits, with the transformation covariant for rotation of the phases. The optimal cloning maps are derived without simplifying assumptions from first principles, for any number of input and output qubits, and for a single input qutrit and any number of output qutrits. We also compare the cloning maps for global and single particle fidelities, and we show that the two criteria lead to different optimal maps.
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