arXiv quant-ph/05121412005-12-17quant-ph

零差检测和光学参量放大：一种经典方法应用于建议的“无环孔”贝尔测试

Homodyne detection and optical parametric amplification: a classical approach applied to proposed "loophole-free" Bell tests

Caroline H Thompson

备注：: 16 pages, 7 figures. Submitted 28 November 2005 to J. Phys. B. For related material see http://freespace.virgin.net/ch.thompson1/

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摘要：

最近提出的“无环孔”贝尔测试的光参量放大和零差检测的相关功能的经典模型进行了讨论。贝尔检验本身是没有争议的：没有可能导致偏见的明显漏洞，因此，如果世界毕竟服从局部实在论，就不会观察到对贝尔不等式的违反。人们的兴趣集中在“非经典”光的拟议标准是否有效的问题上。如果不是，那么实验在最初的概念上就会失败，因为量子理论家和局域实在论者都会同意我们看到的是纯粹的经典效应。然而，贝尔检验并不是判断量子力学模型和局域实在论模型的唯一标准。建议中给出的量子力学模型也将无法进行详细的预测。如果通过包括一系列参数值并通过分析（除了建议的数字化电压差之外）原始电压来扩展实验，则可以在其总体性能和可扩展性方面对模型进行比较。

英文摘要：

Recent proposed ``loophole-free'' Bell tests are discussed in the light of classical models for the relevant features of optical parametric amplification and homodyne detection. The Bell tests themselves are uncontroversial: there are no obvious loopholes that might cause bias and hence, if the world does, after all, obey local realism, no violation of a Bell inequality will be observed. Interest centres around the question of whether or not the proposed criterion for ``non-classical'' light is valid. If it is not, then the experiments will fail in their initial concept, since both quantum theorists and local realists will agree that we are seeing a purely classical effect. The Bell test, though, is not the only criterion by which the quantum-mechanical and local realist models can be judged. It is suggested that the quantum-mechanical models given in the proposals will also fail in their detailed predictions. If the experiments are extended by including a range of parameter values and by analysing, in addition to the proposed digitised voltage differences, the raw voltages, the models can be compared in their overall performance and plausibility.

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