The paper characterizes families of d-dimensional unitaries and qubit Pauli channels that admit masking through bipartite broadcasting channels, with an iff condition that a qubit channel masks against the identity precisely when it is unital and possesses a pure-state fixed point.
Masking of channels{E ⃗ p}M for arbitrary input stateρrequires that Tr X(ME ⃗ p(ρ)M †) is fixed for all⃗ p∈M, withX, Y∈ {A, B}
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Quantum Channel Masking
The paper characterizes families of d-dimensional unitaries and qubit Pauli channels that admit masking through bipartite broadcasting channels, with an iff condition that a qubit channel masks against the identity precisely when it is unital and possesses a pure-state fixed point.