Toward Ultra-high Sensitivity in Weak Value Amplification

Abstract

Achieving higher sensitivity is an earnest purpose for precision metrology. As a response to this goal, the weak value amplification approach has been developed for measuring ultra-small physical effects, realizing sensitivity that had never been reached before. Encouraged by the successes, many efforts have been devoted to obtain ultimate sensitivity of weak value amplification. However, the benefit would be easily compromised in practice, because the cost of significant reduction on signal intensity leads to an ultra-low signal-to-noise ratio. In this work, we bridge this gap by proposing an alternative weak value amplification approach, which provides sensitivity several orders of magnitude higher than the standard approach while being compatible with practical imperfections. In the proof-of-principle experiment of measuring longitudinal phase change in time-domain, sensitivity up to $5\times 10^{-4}$ attosecond is exemplified. Our approach can be applied to measure other small parameters with extremely high sensitivity, providing a new method for future precision metrology.

6 pages, 4 figures. Accepted by Phys.Rev.A

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Cited by in corpus (5)

• A historical review and Bibliometric analysis of research on Weak measurement research over the past decades based on Biblioshiny
• Improving the precision of weak-value-amplification with two cascaded Michelson interferometers based on Vernier-effect
• Robustness of optic-fiber-based weak value amplification against amplitude-type noise
• Quality analysis for precision metrology based on joint weak measurements without discarding readout data
• Weak Value Amplification in High Energy Physics: A Case Study for Precision Measurement of CP Violation in B Meson Decays