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Monitoring entanglement evolution and collective quantum dynamics

AuthorsReuther, Georg M.; Zueco, David; Hänggi, Peter; Kohler, Sigmund
Issue DateJan-2011
PublisherAmerican Physical Society
CitationPhysical Review B 83(1): 014303 (2011)
AbstractWe generalize a recently developed scheme for monitoring coherent quantum dynamics with good time resolution and low backaction [ Reuther et al. Phys. Rev. Lett. 102 033602 (2009)] to the case of more complex quantum dynamics of one or several qubits. The underlying idea is to measure with lock-in techniques the response of the quantum system to a high-frequency ac field. We demonstrate that this scheme also allows one to observe quantum dynamics with many frequency scales, such as that of a qubit undergoing Landau-Zener transitions. Moreover, we propose how to measure the entanglement between two qubits as well as the collective dynamics of qubit arrays.
Description10 páginas, 5 figuras.-- PACS number(s): 42.50.Dv, 03.65.Yz, 03.67.Lx, 85.25.Cp
Publisher version (URL)http://dx.doi.org/10.1103/PhysRevB.83.014303
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