Quantum 2025 – scientific programme
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MON: Monday Contributed Sessions
MON 7: Foundational / Mathematical Aspects – Quantum Measurement
MON 7.3: Talk
Monday, September 8, 2025, 14:45–15:00, ZHG008
The role of redundant correlated records in the emergence of Objective Classical Reality — •VIshal Johnson1,2, Ashmeet Singh3, and Torsten Enßlin1,2 — 1Max Planck Institute for Astrophysics, Garching, Germany — 2Ludwig Maximilians University, Munich, Germany — 3Whitman College, Walla Walla, USA
Quantum measurement inevitably involves a physical system, the observer, in which the result of the measurement procedure is stored. Therefore, in the context of unitary (reversible) quantum mechanics, one has to include the observer as a physical system operating within the limits of quantum mechanics. We argue that a physical quantity (correlation) is a resource used up in each quantum measurement. We put constraints on the nature of environmental/observer states which lead to redundant, classical record formation --- correlation can be provided by a GHZ-like state before or after the interaction with the measured system. A network of such measurements establishes a stable objective classical reality --- the redundant agreement of several observers on the state of the measured quantum system. We verify our hypotheses by simulating the quantum measurement procedure --- observer network states with a high amount of correlation gives rise to high fidelity measurement results.
Keywords: quantum measurement; objective classical reality; measure of correlation