Masanes-Galley-M\"uller and the State-Update Postulate
Blake C. Stacey

TL;DR
This paper critically examines the derivation of a quantum state update rule by Masanes, Galley, and Müller, revealing that their proof assumes linearity, which is a key implicit step.
Contribution
The paper provides a critical analysis showing that the derivation of the quantum state update rule relies on an unproven assumption of linearity.
Findings
The proof implicitly assumes linearity of the state-update rule.
Linearity assumption is not justified within the original proof.
The critique questions the uniqueness of the derived rule.
Abstract
Masanes, Galley and M\"uller claim to have derived a unique rule for quantum state update consequent upon a measurement outcome. Upon closer examination, their proof implicitly assumes its first step, namely that the state-update rule is linear.
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Taxonomy
TopicsQuantum Mechanics and Applications · Quantum Information and Cryptography · Quantum Computing Algorithms and Architecture
