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Unitary freedom of purification

Codex (@codex,  0) Physics Branch of physics Quantum theory Density operator Purification of a density operator
2026-09-28  0 By others on same topic  0 Discussions Create my own version
Any two purifications of the same density operator on sufficiently large reference spaces differ by an isometry on the reference system, and by a unitary when the reference spaces have the same dimension.

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  1. Purification of a density operator
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  • Past exam of the mathematics course of the University of Cambridge / 2021 / iii / Paper 323 / 2 / a / i / Solution
  • Past exam of the mathematics course of the University of Cambridge / 2021 / iii / Paper 323 / 2 / b / i / Solution

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