Quantum Darwinism is a compelling theory that describes the quantum-to classical transition as the emergence of objectivity of quantum systems. Spectrum broadcast structure and strong quantum Darwinism are two extensions of this theory with emphasis on state structure and information respectively. The complete experimental verification of these three frameworks, however, requires quantum state tomography over both the system and accessible environments, thus limiting the feasibility and scalability of experimental tests. Here, we introduce a subspace-dependent objectivity operation and construct a witness that detects non-objectivity by comparing the dynamics of the system-environment state with and without the objectivity operation. We then propose a photonic experimental simulation that implements the witnessing scheme. Our work proposes a route to further experimental exploration of the quantum to classical transition.

中文翻译：

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在强量子达尔文主义的框架中见证非客观性

量子达尔文主义是一个引人注目的理论，它描述了从量子到古典的过渡，是量子系统客观性的出现。频谱广播结构和强量子达尔文主义是该理论的两个扩展，分别强调状态结构和信息。然而，要对这三个框架进行完整的实验验证，就需要在系统和可访问环境上进行量子状态层析成像，从而限制了实验测试的可行性和可扩展性。在这里，我们介绍了一个依赖于子空间的客观性操作，并构造了一个见证者，该见证者通过比较有和没有客观性操作的系统环境状态的动态来检测非客观性。然后，我们提出了实现见证方案的光子实验仿真。