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arXiv 1105.2256quant-ph
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非谐振子的量子纠缠

Quantum entanglement of anharmonic oscillators

Chaitanya Joshi, Mats Jonson, Erika Andersson, Patrik Ohberg

摘要:

研究了四次势非简谐(非线性)振子的量子纠缠动力学。我们首先考虑两个这样的非线性振荡器之间的间接相互作用介导的第三,线性振荡器,并表明,它会导致随时间变化的纠缠的振荡器,纠缠强烈的非线性振荡器动力学的影响。在耗散的存在下,非线性的作用强烈地表现在间接耦合非谐振子的稳态动力学中。我们进一步说明了非线性的影响,通过研究电磁场之间的耦合腔与一个可移动的反射镜,这是一个非线性振荡器建模。对于这种情况下,我们提出了一个完整的分析处理,这是有效的,在政权的非线性和耦合由于辐射压力是弱的。我们表明,不需要任何条件测量的腔场,作为本征非线性和辐射压力耦合的综合作用的结果的可动镜的状态是非经典的。这种相互作用也被证明是负责压缩的可移动的镜子的位置正交超过最小的不确定性状态,即使当镜子最初准备在其基态。

英文摘要:

We investigate the quantum entanglement dynamics of undriven anharmonic (nonlinear) oscillators with quartic potentials. We first consider the indirect interaction between two such nonlinear oscillators mediated by a third, linear oscillator and show that it leads to a time-varying entanglement of the oscillators, the entanglement being strongly influenced by the nonlinear oscillator dynamics. In the presence of dissipation, the role of nonlinearity is strongly manifested in the steady state dynamics of the indirectly coupled anharmonic oscillators. We further illustrate the effect of nonlinearities by studying the coupling between an electromagnetic field in a cavity with one movable mirror which is modeled as a nonlinear oscillator. For this case we present a full analytical treatment, which is valid in a regime where both the nonlinearity and the coupling due to radiation pressure is weak. We show that, without the need of any conditional measurements on the cavity field, the state of the movable mirror is non-classical as a result of the combined effect of the intrinsic nonlinearity and the radiation pressure coupling. This interaction is also shown to be responsible for squeezing the movable mirror's position quadrature beyond the minimum uncertainty state even when the mirror is initially prepared in its ground state.

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