J. Almeida, P. C. de Groot, S. F. Huelga, A. M. Liguori, M. B. Plenio
We discuss how the observation of population localization effects in periodically driven systems can be used to quantify the presence of quantum coherence in interacting qubit arrays. Essential for our proposal is the fact that these localization effects persist beyond tight-binding Hamiltonian models. This result is of special practical relevance in those situations where direct system probing using tomographic schemes becomes infeasible beyond a very small number of qubits. As a proof of principle, we analyze a scheme consisting of a chain of superconducting flux qubits and show that localization effects underpinned by quantum coherent interactions should be observable within realistic parameter regimes.
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http://arxiv.org/abs/1208.6490
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