Enhanced phase sensitivity of an SU(1,1) interferometer with displaced squeezed vacuum light |
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| Institution: | Guangdong Provincial Key Laboratory of Nanophotonic Functional Materials and Devices (SIPSE) & Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials, South China Normal University, Guangzhou 510006, China |
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| Abstract: | We study the phase sensitivity of an SU(1,1) interferometer with two input beams in the displaced squeezed vacuum state and the coherent state, respectively. We find that there exists an optimal squeezing fraction of the displaced squeezed vacuum state that optimizes the phase sensitivity. We also examine the effects of some factors, including the loss, mean photon number of the input beams and amplitude gain of the optical parameter amplifiers, on the optimal squeezing fraction so that we can choose the optimal values to enhance the phase sensitivity. |
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| Keywords: | phase sensitivity SU(1 1) interferometer displaced squeezed vacuum state optimal squeezing fraction |
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