1. Phase sensitivity of an SU(1,1) interferometer via product detection.
- Author
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Wang, Qingle, Fang, Yami, Ma, Xiaoping, and Li, Dong
- Subjects
INTERFEROMETERS ,HOMODYNE detection ,COHERENT states ,METROLOGY ,PAPER products ,BEAM splitters - Abstract
We theoretically analyze the phase sensitivity of an SU (1 , 1) interferometer with various input states by product detection in this paper. This interferometer consists of two parametric amplifiers that play the role of beam splitters in a traditional Mach–Zehnder interferometer. The product of the amplitude quadrature of one output mode and the momentum quadrature of the other output mode is measured via balanced homodyne detection. We show that product detection has the same phase sensitivity as parity detection for most cases, and it is even better in the case with two coherent states at the input ports. The phase sensitivity is also compared with the Heisenberg limit and the quantum Cramér–Rao bound of the SU (1 , 1) interferometer. This detection scheme can be easily implemented with current homodyne technology, which makes it highly feasible. It can be widely applied in the field of quantum metrology. [ABSTRACT FROM AUTHOR]
- Published
- 2021
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