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Mostrando ítems 1-8 de 8
Artículo
Violating bell's inequality beyond Cirel'son's bound
(American Physical Society, 2002-02-11)
Cirel’son inequality states that the absolute value of the combination of quantum correlations appearing in the Clauser-Horne-Shimony-Holt (CHSH) inequality is bound by 2 √ 2. It is shown that the correlations of two qubits ...
Artículo
Proposed experiment for the quantum "Guess My Number" protocol
(American Physical Society, 2005)
An experimental realization of the entanglement-assisted “Guess My Number” protocol for the reduction of communication complexity, introduced by Steane and van Dam, would require producing and detecting three-qubit GHZ ...
Artículo
Quantum key distribution in the Holevo limit
(American Physical Society, 2000-12-25)
A theorem by Shannon and the Holevo theorem impose that the efficiency of any protocol for quantum key distribution, E , defined as the number of secret (i.e., allowing eavesdropping detection) bits per transmitted bit ...
Artículo
Two qubits of a W state violate Bell's inequality beyond Cirel'son's bound
(American Physical Society, 2002-10)
It is shown that the correlations between two qubits selected from a trio prepared in a W state violate the Clauser-Horne-Shimony-Holt inequality more than the correlations between two qubits in any quantum state. Such a ...
Artículo
Entanglement in eight-qubit graph states
(Elsevier, 2009)
Any 8-qubit graph state belongs to one of the 101 equivalence classes under local unitary operations within the Clifford group. For each of these classes we obtain a representative which requires the minimum number of ...
Artículo
Radionuclides in the environment in the south of Spain, anthropogenic enhancements due to industry
(Sociedad Mexicana de Física, 2007-02)
Levels of natural radionuclides in the environment are affected by human activities in the South of Spain. Industry wastes, such as phosphogypsum, have been released to an estuary since sixties until 1997. Nowadays the ...
Artículo
Quantum key distribution without alternative measurements
(American Physical Society, 2000-04-18)
Entanglement swapping between Einstein-Podolsky-Rosen (EPR) pairs can be used to generate the same sequence of random bits in two remote places. A quantum key distribution protocol based on this idea is described. The ...
Artículo
The cumulative effect of three decades of phosphogypsum amendments in reclaimed marsh soils from SW Spain: 226Ra, 238U and Cd contents in soils and tomato fruit
(Elsevier, 2008)
Phosphogypsum (PG), a by-product of the phosphate fertiliser industries, has been applied as soil amendment to reduce Na saturation in soils, as in the reclaimed marsh area from SW Spain, where available PG has a typical ...