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Avoiding dissipation in a system of three quantum harmonic oscillators

AuthorsManzano, Gonzalo ; Galve, Fernando ; Zambrini, Roberta
Issue Date22-Mar-2013
PublisherAmerican Physical Society
CitationPhysical Review - Section A - Atomic Molecular and Optical Physics 87(3): 032114 (2013)
AbstractWe analyze the symmetries in an open quantum system composed by three coupled and detuned harmonic oscillators in the presence of a common heat bath. It is shown analytically how to engineer the couplings and frequencies of the system so as to have several degrees of freedom unaffected by decoherence, irrespective of the specific spectral density or initial state of the bath. This partial thermalization allows observing asymptotic entanglement at moderate temperatures, even in the nonresonant case. This latter feature cannot be seen in the simpler situation of only two oscillators, highlighting the richer structural variety of the three-body case. When departing from the strict conditions for partial thermalization, a hierarchical structure of dissipation rates for the normal modes is observed, leading to a long transient where quantum correlations such as the quantum discord are largely preserved, as well as to synchronous dynamics of the oscillators quadratures. © 2013 American Physical Society.
Publisher version (URL)http://dx.doi.org/10.1103/PhysRevA.87.032114
Identifiersdoi: 10.1103/PhysRevA.87.032114
issn: 1050-2947
e-issn: 1094-1622
Appears in Collections:(IFISC) Artículos
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