The place and role of an Observer in quantum mechanics has been a subject of an ongoing debate since the theory's inception. Wigner brought this question to the fore in a celebrated scenario in which a super-Observer observes a Friend making a measurement. Here we briefly review why this “Wigner Friend scenario” has been taken to require the introduction of the Observer's consciousness, or alternatively to show the inconsistency of quantum measurement theory. We will argue that quantum theory can consistently leave observers outside its narrative, by making only minimal assumptions about how the information about the observed results is stored in material records.

中文翻译：

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维格纳的朋友，费曼的足迹和材料记录

自从该理论诞生以来，观察者在量子力学中的地位和作用一直是一个不断争论的话题。维格纳在一个著名的场景中提出了这个问题，在这个场景中，超级观察者观察到一个朋友进行测量。在这里，我们简要回顾一下为什么采用这种“维格纳朋友情节”来要求引入观察者的意识，或者表明量子测量理论的不一致。我们将争辩说，量子理论可以通过仅对有关观测结果的信息如何存储在物质记录中的假设作最小化，从而始终将观察者置于其叙述之外。