Quantum advantage of time-reversed ancilla-based metrology of open systems
Jiaxuan Wang, R. L. de Matos Filho, Girish Saran Agarwal, L. Davidovich · 2023
We show that a bimodal squeezed state leads to optimal precision in the estimation of loss, overcoming challenges in producing and detecting high photon number Fock states. Using a time-reversal procedure provides a precise estimation that approaches the bound for weak absorption.