Enhanced on-chip phase measurement by inverse weak value amplification

Amplifying interferometric signals—without a corresponding increase in extraneous, unwanted input, or “noise”—on a 2 mm by 2 mm integrated photonic chip.



“Optical interferometry plays an essential role in precision metrology such as in gravitational wave detection, gyroscopes, and environmental sensing. Weak value amplification enables reaching the shot-noise-limit of sensitivity, which is difficult for most optical sensors, by amplifying the interferometric signal without amplifying certain technical noises. We implement a generalized form of weak value amplification on an integrated photonic platform with a multi-mode interferometer. Our results pave the way for a more sensitive, robust, and compact platform for measuring phase, which can be adapted to fields such as coherent communications and the quantum domain. In this work, we show a 7 dB signal enhancement in our weak value device over a standard Mach-Zehnder interferometer with equal detected optical power, as well as frequency measurements with 2 kHz sensitivity by adding a ring resonator.”

Find the open access technical paper link here and University of Rochester article here.

Song, M., Steinmetz, J., Zhang, Y. et al. Enhanced on-chip phase measurement by inverse weak value amplification. Nat Commun 12, 6247 (2021). https://doi.org/10.1038/s41467-021-26522-2.

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