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Figure 1 | EPJ Quantum Technology

Figure 1

From: Phase sensitivity of an \(\operatorname{SU}(1,1)\) interferometer via product detection

Figure 1

(Color online) Schematic diagram of \(\operatorname{SU}(1,1)\) interferometer. Two parametric amplifiers (PAs) take the place of two beam splitters in the traditional Mach–Zehnder interferometer. \(g_{1}\) (\(g_{2}\)) and \(\theta _{1}\) (\(\theta _{2}\)) describe the strength and phase shift introduced by the parametric processes, respectively. \(\hat{a}_{i}\) and \(\hat{b}_{i}\) (\(i=0,1,2\)) denote two modes in the different processes. The pump field between the two PAs has a π phase difference

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