= Foundations II: Measurement and Evolution by John Preskill
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{tag=Work by John Preskill}
Caltech quantum-computation lecture notes, chapter 3.
https://www.preskill.caltech.edu/ph229/notes/chap3.pdf
Verified primary passages: sections 3.4.2–3.4.3, printed pp. 33–37, equations (3.125)–(3.132), unitary system-environment phase damping and spontaneous-emission amplitude damping. Diagonal populations are constant in the phase-damping example, but change in the amplitude-damping example while off-diagonal coherence is suppressed. Reuses the existing John Preskill and Work by John Preskill headers.
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