Sensing with few photons: the power of correlations in lossy SU(1,1) interferometers
Matteo Santandrea, Kai-Hong Luo, Michael Stefszky, Jan Sperling, H. Herrmann, Benjamin Brecht, Christine Silberhorn · Quantum Information and Measurement VI 2021 · 2021
This work explores the phase uncertainty of lossy SU(1,1) interferometers in the low gain regime. We show that coincidence measurement can reach the lowest phase uncertainty possible in the system, regardless of the internal losses.