Nonlinearity as a resource for nonclassicality in anharmonic systems
Nonlinearity as a resource for nonclassicality in anharmonic systems
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DOI：
10.1103/physreva.93.032112
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发表时间：
2016-03-08
影响因子：
2.9
通讯作者：
Paris, Matteo G. A.
中科院分区：
文献类型：
--
作者：
Albarelli, Francesco;Ferraro, Alessandro;Paris, Matteo G. A.
非经典性是涉及宏观量子相干性的量子增强技术和实验的关键因素。考虑到各种精确可解的量子振子系统，我们解决了他们的潜在的非谐性在建立非经典功能所发挥的作用。具体而言，我们表明，所考虑的潜在的熵非线性和它们的基态非经典性之间存在单调关系，量化的负维格纳函数。此外，为了阐明压缩的作用，这是没有捕获的负维格纳函数，我们专注于Glauber-Sudarshan P函数和地址的非经典性非线性关系使用纠缠势。最后，我们考虑的情况下，一个通用的六阶潜在确认的想法，即非线性是一个资源的非经典性的产生，并可能作为工程的量子振荡器的指导方针。
Nonclassicality is a key ingredient for quantum enhanced technologies and experiments involving macroscopic quantum coherence. Considering various exactly solvable quantum-oscillator systems, we address the role played by the anharmonicity of their potential in the establishment of nonclassical features. Specifically, we show that a monotonic relation exists between the entropic nonlinearity of the considered potentials and their ground-state nonclassicality, as quantified by the negativity of the Wigner function. In addition, in order to clarify the role of squeezing, which is not captured by the negativity of the Wigner function, we focus on the Glauber-Sudarshan P function and address the nonclassicality-nonlinearity relation using the entanglement potential. Finally, we consider the case of a generic sixth-order potential confirming the idea that nonlinearity is a resource for the generation of nonclassicality and may serve as a guideline for the engineering of quantum oscillators.