The optimal n-use fidelity for complex conjugating an unknown isometry C^d→C^D is derived in closed form, with parallel protocols proven optimal among all general quantum superchannels.
Strict hierarchy between parallel, sequential, and indefinite-causal-order strategies for channel discrimination,
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Optimal complex conjugation of unknown isometry channels
The optimal n-use fidelity for complex conjugating an unknown isometry C^d→C^D is derived in closed form, with parallel protocols proven optimal among all general quantum superchannels.