Increase of signal-to-noise ratio in weak value measurements

C. Byard, T. Graham, A. Danan, L. Vaidman, A. N. Jordan, P. Kwiat

Research output: Chapter in Book/Report/Conference proceedingChapter


We present a method for improving the signal-to-noise ratio of optical weak measurement techniques by recycling the non-post selected light.We designed a system that allows input photons to cycle through a Sagnac interferometer twice, effectively doubling the detected intensity. A deflection as small as 20 picoradians is discernible. The expected improvement for a shot-noise-limited system is a factor of ã2; however, we observed a larger signal-to-noise ratio enhancement (1.73) which can occur for systems limited by technical noise. [for a video of the talk given by Prof. Kwiat at the Aharonov-80 conference in 2012 at Chapman University, see]

Original languageEnglish (US)
Title of host publicationQuantum Theory
Subtitle of host publicationA Two-Time Success Story: Yakir Aharonov Festschrift the Global Financial Crisis and the Indian Economy
Number of pages7
ISBN (Electronic)9788847052178
ISBN (Print)9788847052161
StatePublished - Jan 1 2014

ASJC Scopus subject areas

  • General Physics and Astronomy


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