SAMOP 2021 – scientific programme

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QI: Fachverband Quanteninformation

QI 10: Certification and Benchmarking of Quantum Systems

QI 10.7: Talk

Thursday, September 23, 2021, 12:15–12:30, H5

When can a quantum measurement be regarded as happened? — •Zhen-Peng Xu, Jonathan Steinberg, Hai Chau Nguyen, and Otfried Guehne — Naturwissenschaftlich-Technische Fakultät, Universität Siegen, 57068 Siegen, Germany

Whether measurements in quantum mechanics can be regarded as absolute events is at the center of the debates in the foundation of quantum mechanics, which have been recently shown to be deeply linked to the concept of Wigner friends as well as that of Bell nonlocality. We argue that, the subtlety is not at the interaction between the measurement device and the system, rather at how the outcomes are perceived. In particular, we show that even regarding measurements of which the outcomes are already partially read as absolutely happens, when combined with the assumptions of the so-called locality and no superdeterminism, is also incompatible with quantum mechanics at its universal validity. This shares also the spirit in Lüders rule of measurements in quantum mechanics, as well as Peres' argument for contextuality.