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.
Fujiwara, Quantum channel identification problem, Phys
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Non-Markovian local dissipative environments protect spin squeezing, enabling robust steady-state squeezing beyond the Born-Markov approximation.
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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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Protecting spin squeezing from decoherence
Non-Markovian local dissipative environments protect spin squeezing, enabling robust steady-state squeezing beyond the Born-Markov approximation.