Performing homodyne detection at a single output port of a squeezed-state light interferometer and then separating the measurement quadrature into two intervals can realize super-resolving and super-sensitive phase measurements,which is equivalent to a binary-outcome measurement.Obviously,the single-port homodyne detection may lose almost part of the phase information,reducing the estimation precision.Here,we propose a data-processing technique over the double-port homodyne detection,where the two-dimensional measurement quadrature(p1,P2)has been divided into two regions.With such a binary-outcome measurement,we estimate the phase shift accumulated in the interferometer by inverting the output signal.By analyzing the full width at half maximum of the signal and the phase sensitivity,we show that both the resolution and the achievable sensitivity are better than that of the previous binary-outcome scheme.

Key Laboratory of Optical Field Manipulation of Zhejiang Province and Physics Department of Zhejiang Sci-Tech University,Hangzhou 310018,China;China Academy of Electronics and Information Technology,Beijing 100041,China

[1]Likun Zhou;Pan Liu;Guang-Ri Jin-.Double-port homodyne detection in a squeezed-state interferometry with a binary-outcome data processing)[J].理论物理,2022(12):45-51

homodyne

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