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.
Genovese, Real applications of quantum imaging, Journal of Optics 18, 073002 (2016)
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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.