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A spectator system in an atoms-cavity QED model is investigated. The subsystem initial state is prepared as one of the Bell states or one mixed state. It is shown that (i) the dynamics of Bell states are independent on the initial states; (ii) the concurrence dynamics can be engineered by a controlling light field. 相似文献
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We theoretically investigate the optomechanical induced transparency(OMIT) phenomenon in a two-cavity system which is composed of two optomechanical cavities. Both of the cavities consist of a fixed mirror and a high-Q mechanical resonator, and they couple to each other via a common waveguide. We show that in the presence of a strong pump field applied to one cavity and a weak probe field applied to the other, a triple-OMIT can be observed in the output field at the probe frequency. The two mechanical resonators in the two cavities are identical, but they lead to different quantum interference pathways. The transparency windows are induced by the coupling of the two cavities and the optical pressure radiated to the mechanical resonators, which can be controlled via the power of the pump field and the coupling strength of the two cavities. 相似文献
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The dynamics of two coupled spins-1/2 coupled to a spin-bath is
studied as an extended model of the Tessieri--Wilkie Hamiltonian. The
pair of spins served as an open subsystem is prepared in one of the
Bell states and the bath consisting of some spins-1/2 is in a thermal
equilibrium state from the very beginning. It is found that with
increasing coupling strength of the bath spins, the bath forms a
resonant antiferromagnetic order. The polarization correlation
between the two spins of the subsystem and the concurrence of it are
recovered to some extent in the isolated subsystem. This suppression
of the subsystem decoherence may be used to control the quantum
devices in practical applications. 相似文献
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