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MON: Monday Contributed Sessions

MON 7: Foundational / Mathematical Aspects – Quantum Measurement

MON 7.4: Talk

Monday, September 8, 2025, 15:00–15:15, ZHG008

Ultradecoherence model of the measurement process — •Hai-Chau Nguyen — University of Siegen

It is proposed that measurement devices can be modelled to have an open decoherence dynamics that is faster than any other relevant timescale, which is referred to as the ultradecoherence limit. In this limit, the measurement device always assumes a definite state upto the accuracy set by the fast decoherence timescale. Further, it is shown that the clicking rate of measurement devices can be derived from its underlying parameters, not only for the von Neumann ideal measurement devices but also for photon detectors in equal footing. This study offers a glimpse into the intriguing physics of measurement processes in quantum mechanics, with many aspects open for further investigation.

Keywords: Measurement; Decoherence; Classicality; Quantum; Definite states