Practical advantages of almost-balanced-weak-value metrological techniques

Julián Martínez-Rincón, Zekai Chen, John C. Howell

Research output: Contribution to journalArticlepeer-review


Precision measurements of ultrasmall linear velocities of one of the mirrors in a Michelson interferometer are performed using two different weak-value techniques. We show that the technique of almost-balanced weak values (ABWV) offers practical advantages over the technique of weak-value amplification, resulting in larger signal-to-noise ratios and the possibility of longer integration times due to robustness to slow drifts. As an example of the performance of the ABWV protocol we report a velocity sensitivity of 60 fm/s after 40 h of integration time. The sensitivity of the Doppler shift due to the moving mirror is 150 nHz.

Original languageEnglish
Article number063804
JournalPhysical Review A
Issue number6
StatePublished - 5 Jun 2017
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics


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