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Frontiers in Optics

Weak Value Measurements with Pulse Recycling

Courtney Krafczyk, Trent Graham, Andrew N. Jordan, Paul G. Kwiat

Published Jan 1, 2016• 0 citations
Publisher

Abstract

Recycling undetected photons in a weak measurement can substantially improve the signal-to-noise ratio. We demonstrate a preliminary improvement by a factor of 1.36 over a system with no recycling, potentially reaching a factor of 3.2.
DOI
10.1364/fio.2016.ftu2f.4

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Get PDF Email Share Share with Facebook Tweet This Post on reddit Share with LinkedIn Add to CiteULike Add to Mendeley Add to BibSonomy Get Citation Copy Citation Text C. Byard, T. Graham, A. Jordan, and P. Kwiat, "Using Recycling to Increase the Signal-to-Noise Ratio in Weak Measurements," in Research in Optical Sciences , OSA Technical Digest (online) (Optica Publishing Group, 2014), paper QTh4A.3. Export Citation BibTex Endnote (RIS) HTML Plain Text Citation alert Save article

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Chinese Physics B•Jan 13, 2021•4 citations
In a quantum-noise limited system, weak-value amplification using postselection normally does not produce more sensitive measurements than standard methods for ideal detectors: the increased weak value is compensated by the reduced power due to the small postselection probability. Here, we experimentally demonstrate recycled weak-value measurements using a pulsed light source and optical switch to enable nearly deterministic weak-value amplification of a mirror tilt. Using photon counting detectors, we demonstrate a signal improvement by a factor of 4.4±0.2 and a signal-to-noise ratio improvement of 2.10±0.06, compared to a single-pass weak-value experiment, and also compared to a conventional direct measurement of the tilt. The signal-to-noise ratio improvement could reach around six for the parameters of this experiment, assuming lower loss elements.
Weak value amplification has shown its superiority in measurement of small physical effects. Here we introduce a signal-recycled weak-value-based velocity measurement strategy to decrease the attenuation of detected photons during the post-selection. Like the power-recycled scheme, we can improve the number of detected photons and signal-to-noise ratio of velocity by forming a cavity. However, optimal improvements of number of detected photons and signal-to-noise ratio cannot be obtained simultaneously in our signal-recycled scheme owing to the walk-off effect. Furthermore, we find that the reflected light is relatively strong compared with the power-recycled scheme, which may increase the collection-detection efficiency in prospective relevant experiment.