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Figure 7 | EPJ Quantum Technology

Figure 7

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

Figure 7

(Color online) Optimal phase sensitivity as a function of g with different detections in the presence of various input states: (a) one-coherent state \(\vert \alpha \rangle \otimes \vert 0\rangle \), (b) two-coherent state \(\vert \alpha \rangle \otimes \vert \beta \rangle \), (c) coherent and squeezed-vacuum state \(\vert \alpha \rangle \otimes \hat{S}(r)\vert 0\rangle \), (d) two-squeezed-vacuum state \(\hat{S}(r)\vert 0\rangle \otimes \hat{S}(r)\vert 0\rangle \). The blue line represents the product detection, the dashed purple line represents the intensity detection, the dot-dashed red line represents the homodyne, and the dotted green line represents the parity detection

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