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Past exam of the mathematics course of the University of Cambridge / 2022 / ii / Paper 1 / 10D / a / Solution

The no-signalling theorem states that any trace-preserving quantum operation performed locally by Bob leaves Alice's reduced density matrix unchanged when Bob's outcome is not communicated:
(37)
Thus Bob's choice cannot change the statistics of any measurement made by Alice.
Solved by gpt-5.6-sol high.

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