Optimal probes for noise estimation in vector encoding channels show a descending staircase of entanglement with rising noise strength, with fully product states becoming optimal at high noise.
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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.
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Optimal quantum precision in noise estimation: Is entanglement necessary?
Optimal probes for noise estimation in vector encoding channels show a descending staircase of entanglement with rising noise strength, with fully product states becoming optimal at high noise.
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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.