Żukowski Marek, Markiewicz Marcin
International Centre for Theory of Quantum Technologies (ICTQT), University of Gdansk, 80-308 Gdansk, Poland.
Phys Rev Lett. 2021 Apr 2;126(13):130402. doi: 10.1103/PhysRevLett.126.130402.
"The unambiguous account of proper quantum phenomena must, in principle, include a description of all relevant features of experimental arrangement" (Bohr). The measurement process is composed of premeasurement (quantum correlation of the system with the pointer variable) and an irreversible decoherence via interaction with an environment. The system ends up in a probabilistic mixture of the eigenstates of the measured observable. For the premeasurement stage, any attempt to introduce an "outcome" leads, as we show, to a logical contradiction, 1=i. This nullifies claims that a modified concept of Wigner's friend, who just premeasures, can lead to valid results concerning quantum theory.
“对恰当量子现象的明确描述，原则上必须包括对实验装置所有相关特征的描述”（玻尔）。测量过程由预测量（系统与指针变量的量子关联）以及通过与环境相互作用产生的不可逆退相干组成。系统最终处于被测可观测量本征态的概率混合态。对于预测量阶段，正如我们所表明的，任何引入“结果”的尝试都会导致逻辑矛盾，即1 = i。这使得关于仅仅进行预测量的维格纳朋友的修正概念能够得出有关量子理论的有效结果的说法无效。
