Zobrazeno 1 - 10
of 414
pro vyhledávání: '"Buscemi F."'
Publikováno v:
Phys. Rev. A 87, 052328 (2013)
We address the dynamics of entanglement and quantum discord for two non interacting qubits initially prepared in a maximally entangled state and then subjected to a classical colored noise, i.e. coupled with an external environment characterized by a
Externí odkaz:
http://arxiv.org/abs/1212.1484
Publikováno v:
Open Sys. & Information Dyn. 14, 53 (2007)
We consider the classical algebra of observables that are diagonal in a given orthonormal basis, and define a complete decoherence process as a completely positive map that asymptotically converts any quantum observable into a diagonal one, while pre
Externí odkaz:
http://arxiv.org/abs/quant-ph/0611070
Publikováno v:
Phys. Rev. A 75, 012315 (2007)
We address the problem of broadcasting N copies of a generic qubit state to M>N copies by estimating its direction and preparing a suitable output state according to the outcome of the estimate. This semiclassical broadcasting protocol is more restri
Externí odkaz:
http://arxiv.org/abs/quant-ph/0608153
Publikováno v:
J. Math. Phys. 46, 082109 (2005)
In quantum mechanics the statistics of the outcomes of a measuring apparatus is described by a positive operator valued measure (POVM). A quantum channel transforms POVM's into POVM's, generally irreversibly, thus loosing some of the information retr
Externí odkaz:
http://arxiv.org/abs/quant-ph/0505095
Autor:
Buscemi, F., Compagno, G.
Publikováno v:
Phys.Lett. A334 (2005) 357-362
The evolution of the expectation values of one and two points scalar field operators and of positive localization operators, generated by an istantaneous point source is non local. Non locality is attributed either to zero point vacuum fluctuations,
Externí odkaz:
http://arxiv.org/abs/quant-ph/0409139
Publikováno v:
Phys. Rev. Lett 92, 070403 (2004)
We show that, contrarily to the widespread belief, in quantum mechanics repeatable measurements are not necessarily described by orthogonal projectors--the customary paradigm of "observable". Nonorthogonal repeatability, however, occurs only for infi
Externí odkaz:
http://arxiv.org/abs/quant-ph/0310041
Publikováno v:
Phys. Rev. A 68, 042113 (2003)
Quantum operations (QO) describe any state change allowed in quantum mechanics, such as the evolution of an open system or the state change due to a measurement. We address the problem of which unitary transformations and which observables can be use
Externí odkaz:
http://arxiv.org/abs/quant-ph/0305180
Publikováno v:
Phys. Lett. A 314, 374 (2003)
We solve the problem of achieving the optimal physical approximation of the transposition for pure states of arbitrary quantum systems for finite and infinite dimensions. A unitary realization is also given for any finite dimension, which provides th
Externí odkaz:
http://arxiv.org/abs/quant-ph/0304175
Publikováno v:
Phys. Lett. A 312, 315 (2003)
We explicitly construct a large class of unitary transformations that allow to perform the ideal estimation of the phase-shift on a single-mode radiation field. The ideal phase distribution is obtained by heterodyne detection on two radiation modes a
Externí odkaz:
http://arxiv.org/abs/quant-ph/0304071
Akademický článek
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