Author

Yujie Zhang

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Preprint Jul 2026

Exact Incompatibility-Breaking Criterion for Unital Qubit Channels

We study when a noisy qubit channel renders all positive-operator-valued measures (POVMs) jointly measurable. For every unital qubit channel, we derive the exact incompatibility-breaking criterion and prove that projective measurements already determine the boundary for arbitrary POVMs. Through the steering--joint-meas...

Yujie Zhang · 1 citation