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首页> 外文期刊>Physica Scripta: An International Journal for Experimental and Theoretical Physics >On the measure of nonclassicality of field states
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On the measure of nonclassicality of field states

机译：关于场态非经典性的度量

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The degree of nonclassicality of states of a field mode is analysed considering both phase-space and distance-type measures of nonclassicality. By working out some general examples. it is shown explicitly that the phase-space measure is rather sensitive to superposition of states. with finite superpositions possessing maximum nonclassical depth (the highest degree of nonclassicality) irrespective of the nature of the component states. Mixed states are also discussed and examples with nonclassical depth varying between the minimum and the maximum allowed values are exhibited. For pure Gaussian states. it is demonstrated that distance-type measures based on the Hilbert-Schmidt metric are equivalent to the phase-space measure. Analyzing some examples, it is shown that distance-type measures are efficient to quantify the degree of nonclassicality of non- Gaussian pure states. [References: 21]
机译：考虑相空间和距离类型的非经典性度量，分析了场模式状态的非经典性程度。通过制定一些一般示例。明确表明，相空间量度对状态的叠加非常敏感。不论分量状态的性质如何，具有最大非经典深度（非经典程度最高）的有限叠加的组合。还讨论了混合状态，并显示了非经典深度在最小和最大允许值之间变化的示例。对于纯高斯状态。结果表明，基于希尔伯特-施密特度量的距离类型度量等同于相空间度量。通过分析一些例子，可以看出距离类型测度可以有效地量化非高斯纯态的非经典程度。 [参考：21]

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