A phase-shift scrambler placed between two successive squeezings restores joint estimability of both squeezing parameters, and joint estimation outperforms stepwise estimation in this model.
Holevo,Probabilistic and Statistical Aspects of Quantum Theory(Edizioni della Normale Pisa, 2011)
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Mitigating sloppiness in joint estimation of successive squeezing parameters
A phase-shift scrambler placed between two successive squeezings restores joint estimability of both squeezing parameters, and joint estimation outperforms stepwise estimation in this model.