Abstract
Imperfections and environmental disturbances will unavoidably cause undesired deviations and bias in the output of devices deployed in the Mach–Zehnder interferometer. In particular, for a feedback scheme, the inevitable imperfections of the optical phase controller severely limit the final measurement precision. In this letter, we propose an approach making use of the well-known weak measurement technique for control operation in order to conquer the imperfections. In consequence, the practical measurement precision can be effectively improved. Interestingly, the improvement, which can be intense with a proper weak measurement, follows a small weak value instead of the common large one. In addition, a proof-of principle experiment is demonstrated to verify the effects of the proposed approach. We anticipate that our approach can be widely extended to many fields requiring high accuracy control.
Published Version
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