Extends qubit-channel metrology to spectator noise, supplying algebraic tests that decide when correlated n-qubit inputs beat single-qubit inputs under different noise types.
4, where the ˆUj is the unitary cor- responding to Bloch-sphere rotation Rj = sja⊤ + tjb⊤ + ujd⊤
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Noisy initial-state qubit-channel metrology with additional undesirable noisy evolution
Extends qubit-channel metrology to spectator noise, supplying algebraic tests that decide when correlated n-qubit inputs beat single-qubit inputs under different noise types.