Operational Concealment of Measurement Incompatibility by Quantum Channels

Key points

It defined operational concealment as the phenomenon in which measurement incompatibility can no longer be certified when all input states pass through a quantum channel.
In finite dimensions, it proved that some binary POVM pair is exactly concealed only if the channel's Heisenberg adjoint has a nontrivial kernel.
It distinguished injective dynamics that only contract from cases where information rank decreases, and derived an exact expression for concealment robustness in qubit channels.
Using quotient-space duality, it interpreted this robustness as an experimentally accessible reward advantage in channel-output games.
The analysis is limited to finite-dimensional, finite-outcome measurements, exact knowledge of the channel, complete input tomography, and single use; it does not cover adaptive multiple uses.

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