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Phase sensitivity at the Heisenberg limit in an SU(1,1) interferometer via parity detection

We theoretically investigate the phase sensitivity with parity detection on an SU(1,1) interferometer with a coherent state combined with a squeezed vacuum state. This interferometer is formed with two parametric amplifiers for beam splitting and recombination instead of beam splitters. We show that the sensitivity of estimation phase approaches Heisenberg limit and give the corresponding optimal condition. Moreover, we derive the quantum Cramér-Rao bound of the SU(1,1) interferometer.

preprint2016arXivOpen access
Dong LiBryan T. GardYang GaoChun-Hua YuanWeiping ZhangHwang LeeJonathan P. Dowling
quant-ph
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Dong LiBryan T. GardYang GaoChun-Hua YuanWeiping ZhangHwang LeeJonathan P. Dowling

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