Quantum-information processing in disordered and complex quantum systems
Sen, Aditi (Institut de Ciències Fotòniques)
Sen, Ujjval (Institut de Ciències Fotòniques)
Ahufinger, Verònica (Universitat Autònoma de Barcelona. Departament de Física)
Briegel, Hans J. (Österreichische Akademie der Wissenschaften. Institut für Quantenoptik und Quanteninformation)
Sanpera Trigueros, Anna (Universitat Autònoma de Barcelona. Departament de Física)
Lewenstein, Maciej (University of Hannover. Institute of Theoretical Physics)
American Physical Society

Date:	2006
Abstract:	We study quantum information processing in complex disordered many body systems that can be implemented by using lattices of ultracold atomic gases and trapped ions. We demonstrate, first in the short range case, the generation of entanglement and the local realization of quantum gates in a disordered magnetic model describing a quantum spin glass. We show that in this case it is possible to achieve fidelities of quantum gates higher than in the classical case. Complex systems with long range interactions, such as ions chains or dipolar atomic gases, can be used to model neural network Hamiltonians. For such systems, where both long range interactions and disorder appear, it is possible to generate long range bipartite entanglement. We provide an efficient analytical method to calculate the time evolution of a given initial state, which in turn allows us to calculate its quantum correlations.
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Language:	Anglès
Document:	Article ; recerca ; Versió publicada
Published in:	Physical review. A, Vol. 74, Issue 6 (December 2006) , p. 062309-1-062309-8, ISSN 1050-2947

DOI: 10.1103/PhysRevA.74.062309

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