Phase amplification in optical interferometry with weak measurement

Li Li, Yuan Li, You-Lang Zhang, Sixia Yu, Chao-Yang Lu, Nai-Le Liu, Jun Zhang, Jian-Wei Pan

Research output: Journal article publicationJournal articleAcademic researchpeer-review


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 the phase shift in optical interferometry. Given an initial ultrasmall phase shift between orthogonal polarization states, we observe a 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.
Original languageOthers/Unknown
Pages (from-to)033851
Number of pages1
JournalPhysical Review A
Issue number3
Publication statusPublished - Mar 2018
Externally publishedYes

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