Delocalized photon subtraction inside an SU(1,1) interferometer improves phase sensitivity and quantum Fisher information over localized subtraction and approaches the quantum Cramér-Rao bound.
Gopinath, Cas- caded multiparameter quantum metrology , Phys
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Phase estimation via delocalized photon subtraction operation inside the SU(1,1) interferometer
Delocalized photon subtraction inside an SU(1,1) interferometer improves phase sensitivity and quantum Fisher information over localized subtraction and approaches the quantum Cramér-Rao bound.