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Open Access item Monitoring entanglement evolution and collective quantum dynamics

Authors:Reuther, Georg M.
Zueco, David
Hänggi, Peter
Kohler, Sigmund
Issue Date:Jan-2011
Publisher:American Physical Society
Citation:Physical Review B 83(1): 014303 (2011)
Abstract:We 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.
Description:10 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
URI:http://hdl.handle.net/10261/47557
ISSN:1098-0121
E-ISSNmetadata.dc.identifier.doi = DOI:1550-235X
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