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11.
We discuss the notion of spin squeezing considering two mutually exclusive classes of spin-s states, namely, oriented and non-oriented states. Our analysis shows that the oriented states are not squeezed while non-oriented
states exhibit squeezing. We also present a new scheme for construction of spin-s states using 2s spinors oriented along different axes. Taking the case of s=1, we show that the ‘non-oriented’ nature and hence squeezing arise from the intrinsic quantum correlations that exist among
the spinors in the coupled state. 相似文献
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L M Gambardella É D Taillard M Dorigo 《The Journal of the Operational Research Society》1999,50(2):167-176
This paper presents HAS–QAP, a hybrid ant colony system coupled with a local search, applied to the quadratic assignment problem. HAS–QAP uses pheromone trail information to perform modifications on QAP solutions, unlike more traditional ant systems that use pheromone trail information to construct complete solutions. HAS–QAP is analysed and compared with some of the best heuristics available for the QAP: two versions of tabu search, namely, robust and reactive tabu search, hybrid genetic algorithm, and a simulated annealing method. Experimental results show that HAS–QAP and the hybrid genetic algorithm perform best on real world, irregular and structured problems due to their ability to find the structure of good solutions, while HAS–QAP performance is less competitive on random, regular and unstructured problems. 相似文献
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Maria Teresa do Prado Gambardella Regina Helena Porto Francisco Ana Maria G. Dias Rodrigues Gerimrio Freitas de Sousa 《Acta Crystallographica. Section C, Structural Chemistry》2000,56(5):e176-e177
In the title compound, [SnCl3(CH3)(C6H5SOCH2)2]n, the octahedral SnIV centres are bridged by meso‐1,2‐bis(phenylsulfinyl)ethane ligands forming infinite chains along the [100] direction. 相似文献
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Mário L.A.A. Vasconcellos Mauro L. Mellão Uendel G. Barreiros Marcelo C. Branco Maria T.P.Gambardella Oduvaldo F. Ramos 《合成通讯》2013,43(21):4077-4085
New alcohols 3d, 3e and 3f were efficiently prepared in enantiopure form (2 steps, 50–58%), from available 1-(R)-(+)-camphor 1. The absolute configurations were assigned by NMR and relative X-ray crystallographic analysis. 相似文献
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P. Bondi P. Fergola L. Gambardella C. Tenneriello P. Hagedorn 《Mathematical Methods in the Applied Sciences》1981,3(1):516-522
In this paper the limiting equations approach is applied to study the stability properties with respect to a part of the state variables for nonautonomous dynamical systems. Sufficient conditions are given for uniform asymptotic eventual strongly partial stability and for uniform asymptotic partial stability. An application of the results is given. 相似文献
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