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Phase amplification in optical interferometry with weak measurement

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posted on 2023-11-30, 05:26 authored by Li Li, Yuan Li, You-Lang Zhang, Sixia Yu, Chao-Yang Lu, Nai-Le Liu, Jun Zhang, Jian-Wei Pan
Improving the phase resolution of interferometry is crucial for high-precision measurements of various physical quantities. Systematic phase errors dominate the phase uncertainties in most realistic optical interferometers. Here we propose and experimentally demonstrate a weak measurement scheme to considerably suppress the phase uncertainties by the direct amplification of phase shift in optical interferometry. Given an initial ultra-small phase shift between orthogonal polarization states, we observe the phase amplification effect with a factor of 388. Our weak measurement scheme provides a practical approach to significantly improve the interferometric phase resolution, which is favorable for precision measurement applications.

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