Quantum-information processing in disordered and complex quantum systems

Aditi Sen, Ujjwal Sen, Veronica Ahufinger, Hans J. Briegel, Anna Sanpera, MacIej Lewenstein

Research output: Contribution to journalArticleResearchpeer-review

9 Citations (Scopus)


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. © 2006 The American Physical Society.
Original languageEnglish
Article number062309
JournalPhysical Review A - Atomic, Molecular, and Optical Physics
Publication statusPublished - 27 Dec 2006


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