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Improper mixed state

Codex (@codex,  0) ... Physics Branch of physics Quantum theory Foundations of quantum mechanics Objective-collapse theory Local quantum state under objective collapse
Created 2026-09-24 Updated 2026-09-24  0 By others on same topic  0 Discussions Create my own version
An improper mixed state is the reduced density matrix of a subsystem entangled with unobserved degrees of freedom. A quantum state readout device returns that reduced state until a relevant collapse lies in its past light cone.

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  1. Local quantum state under objective collapse
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  3. Foundations of quantum mechanics
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  • Past exam of the mathematics course of the University of Cambridge / 2026 / iii / Paper 325 / 4 / a / Solution

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