Institute of Theoretical Physics and Astrophysics, University of Gdańsk, 80-952 Gdańsk, Poland and National Quantum Information Centre in Gdanśk, 81-824 Sopot, Poland.
National Quantum Information Centre in Gdanśk, 81-824 Sopot, Poland and Faculty of Applied Physics and Mathematics, Gdańsk University of Technology, 80-233 Gdańsk, Poland.
Phys Rev Lett. 2014 Mar 28;112(12):120402. doi: 10.1103/PhysRevLett.112.120402. Epub 2014 Mar 26.
Recently, the emergence of classical objectivity as a property of a quantum state has been explicitly derived for a small object embedded in a photonic environment in terms of a spectrum broadcast form-a specific classically correlated state, redundantly encoding information about the preferred states of the object in the environment. However, the environment was in a pure state and the fundamental problem was how generic and robust is the conclusion. Here, we prove that despite the initial environmental noise, the emergence of the broadcast structure still holds, leading to the perceived objectivity of the state of the object. We also show how this leads to a quantum Darwinism-type condition, reflecting the classicality of proliferated information in terms of a limit behavior of the mutual information. Quite surprisingly, we find "singular points" of the decoherence, which can be used to faithfully broadcast a specific classical message through the noisy environment.
最近，在一个小物体嵌入光子环境的情况下，已经明确地从广播形式的谱中推导出了经典客观性作为量子态的一个属性——一种特殊的经典相关态，冗余地编码了关于环境中物体的优选状态的信息。然而，环境处于纯态，基本问题是这个结论的普遍性和鲁棒性如何。在这里，我们证明了尽管存在初始环境噪声，广播结构的出现仍然成立，导致了物体状态的感知客观性。我们还展示了这如何导致一种量子达尔文主义类型的条件，反映了增殖信息的经典性，这可以通过互信息的极限行为来表示。非常令人惊讶的是，我们发现了退相干的“奇异点”，可以通过嘈杂的环境来忠实地广播特定的经典信息。
