论文标题
Wigner的朋友和准理论时钟
Wigner's friend and the quasi-ideal clock
论文作者
论文摘要
1962年,Eugene P. Wigner引入了一个思想实验,该实验强调了量子理论在测量中的单位进化和波函数降低之间的不兼容。这项工作导致了经常称为Wigner的朋友场景的一类思想实验,这些实验一直在提供有关许多框架和量子理论的解释的见解。最近,Daniela Frauchiger和Renato Renner获得的无关定理引起了Wigner的朋友的注意,及其对理论进行测试的潜力。对此结果的许多答案指出,思想实验中的时间如何产生悖论。在这项工作中,我们询问如果Wigner的朋友场景中的孤立朋友没有与外部观察者共享时间参考框架,并且时间应通过量子时钟跟踪。为此,我们回忆起量子参考框架理论和不对称的量子资源理论提供的概念,以了解如何在这种情况下内化时间,并为Mischa P. Woods,Ralph Silva和Jonathan Oppenheim提出的可行量子时钟引入模型,称为Quasi-iDeal Clight。我们的结果表明,这种方法没有任何变形的行为,而超级迷恋者与其朋友之间的分歧仍然存在,即使在Wigner的一边进行了不精确的时钟。但是,该时钟模型的高斯传播可以控制观察物不会引起悖论,这表明加深了这种分析的相关性。
In 1962, Eugene P. Wigner introduced a thought experiment that highlighted the incompatibility in quantum theory between unitary evolution and wave function reduction in a measurement. This work resulted in a class of thought experiments often called Wigner's Friend Scenarios, which have been providing insights over many frameworks and interpretations of quantum theory. Recently, a no-go theorem obtained by Daniela Frauchiger and Renato Renner brought attention back to the Wigner's Friend and its potential of putting theories to test. Many answers to this result pointed out how timing in the thought experiment could be yielding a paradox. In this work, we ask what would happen if the isolated friend in a Wigner's Friend Scenario did not share a time reference frame with the outer observer, and time should be tracked by a quantum clock. For this purpose, we recollect concepts provided by the theory of quantum reference frames and the quantum resource theory of asymmetry, to learn how to internalize time in this scenario, and introduce a model for a feasible quantum clock proposed by Mischa P. Woods, Ralph Silva and Jonathan Oppenheim, called the quasi-ideal clock. Our results have shown that no decoherent behavior comes from this approach, and the disagreement between the superobserver and its friend persists even for an imprecise clock on Wigner's side. However, the gaussian spread of this clock model can control what observables do not raise a paradox, indicating the relevance of deepening this analysis.