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Violation of a Leggett–Garg inequality with ideal non-invasive measurements

机译:理想的非侵入式测量违反了Leggett–Garg不等式

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摘要

The quantum superposition principle states that an entity can exist in two different states simultaneously, counter to our 'classical' intuition. Is it possible to understand a given system's behaviour without such a concept? A test designed by Leggett and Garg can rule out this possibility. The test, originally intended for macroscopic objects, has been implemented in various systems. However to date no experiment has employed the 'ideal negative result' measurements that are required for the most robust test. Here we introduce a general protocol for these special measurements using an ancillary system, which acts as a local measuring device but which need not be perfectly prepared. We report an experimental realization using spin-bearing phosphorus impurities in silicon. The results demonstrate the necessity of a non-classical picture for this class of microscopic system. Our procedure can be applied to systems of any size, whether individually controlled or in a spatial ensemble.
机译:量子叠加原理指出,一个实体可以同时以两种不同状态存在,这与我们的“经典”直觉相反。如果没有这样的概念,是否有可能了解给定系统的行为? Leggett和Garg设计的测试可以排除这种可能性。该测试最初用于宏观对象,现已在各种系统中实施。但是,迄今为止,还没有实验采用最可靠的测试所需要的“理想阴性结果”测量。在这里,我们介绍了使用辅助系统进行这些特殊测量的通用协议,该辅助系统可以用作本地测量设备,但无需完善准备。我们报告了在硅中使用自旋含磷杂质的实验实现。结果证明了对于这类微观系统非经典图片的必要性。我们的程序可以应用于任何规模的系统,无论是单独控制还是空间集成。

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