Search results for "Star system"
showing 6 items of 6 documents
Tripartite thermal correlations in an inhomogeneous spin-star system
2010
We exploit the tripartite negativity to study the thermal correlations in a tripartite system, that is the three outer spins interacting with the central one in a spin-star system. We analyze the dependence of such correlations on the homogeneity of the interactions, starting from the case where central-outer spin interactions are identical and then focusing on the case where the three coupling constants are different. We single out some important differences between the negativity and the concurrence.
Tre volte Marilyn: grazie e destino di una diva ‘‘moderna’’
2019
Il saggio si occupa dell'ultimo film interpretato da Marilyn Monroe prima di morire, Gli Spostati The Misfits (Huston, 1961) is the last film interpreted by Marilyn Monroe. The film is a precious observation point to analyze the triple figure of Marilyn Monroe: the character, the actress, the woman. The Misfits is the clear attempt to deconstruct the image of a diva, through the crisis of her own character. This is the condensed artistic and creative parable of Marilyn Monroe and, simultaneously, the most obvious sign of the end of the great Hollywood film industry.
Interaction-free evolving states of a bipartite system
2014
We show that two interacting physical systems may admit entangled pure or non separable mixed states evolving in time as if the mutual interaction hamiltonian were absent. In this paper we define these states Interaction Free Evolving (IFE) states and characterize their existence for a generic binary system described by a time independent Hamiltonian. A comparison between IFE subspace and the decoherence free subspace is reported. The set of all pure IFE states is explicitly constructed for a non homogeneous spin star system model.
Entanglement dynamics in a spin star system
2009
The implementation of more and more efficient nanodevices exploitable in applicative contexts like for example quantum computers often requires a highly challenging miniaturizing process aimed at packing a huge number of point-like basic elements whose dynamics mimics indeed that of a qubit. Stimulated by such a requirement, over the last few years theoretical schemes using the language of the spin ½ system models have been investigated. The main reason is that besides the simple dynamical behaviour of each elementary constituent these Hamiltonian models do indeed capture basic ingredients of several physical situations differing one another mainly for the numerical values of some relevant …
Spin‐Chain‐Star Systems: Entangling Multiple Chains of Spin Qubits
2022
We consider spin-chain-star systems characterized by N-wise many-body interactions between the spins in each chain and the central one. We show that such systems can be exactly mapped into standard spin-star systems through unitary transformations. Such an approach allows the solution of the dynamic problem of an XX$X X$ spin-chain-star model and transparently shows the emergence of quantum correlations in the system, based on the idea of entanglement between chains.
Assenti giustificati. Visioni mediatiche di Stefano Bullo
2012
Prima mostra personale del giovane pittore muranese Stefano Bullo, già selezionato alla Bevilacqua La Masa e vincitore del Premio Burano di Pittura.