Quantum interferometer with two-mode squeezed vacuum: Ŝ 2 z measurement
Yuanming Zhang, Xinwei Li, Guangri Jin · Chinese Physics B · 2013
Quantum interferometric strategy with input two-mode squeezed vacuum [ Phys. Rev. Lett. 104 103602 ] is reexamined for both parity and Ŝ 2 z measurements. Unlike the previous scheme, we find that phase sensitivity obtained with the Ŝ 2 z measurement is minimized at phase origin, which may be useful to estimate a small phase shift at high precision. For the phase deviated from zero, the sensitivity increases more slowly than that of the parity detection.