Amplifying Single-Photon Nonlinearity Using Weak Measurement

TL;DR

This paper demonstrates that weak measurement techniques can significantly amplify single-photon nonlinear effects, improving signal detection in quantum optics with no classical counterpart.

Contribution

It introduces a novel scheme utilizing weak-value amplification to enhance single-photon nonlinearities beyond previous methods.

Findings

Weak measurement amplifies single-photon effects to classical beam levels.

Improved signal-to-noise ratio in noisy environments.

No classical equivalent for the proposed amplification scheme.

Abstract

We show that weak measurement can be used to "amplify" optical nonlinearities at the single- photon level, such that the effect of one properly post-selected photon on a classical beam may be as large as that of many un-post-selected photons. We find that "weak-value amplification" offers a marked improvement in signal-to-noise ratio in the presence of technical noise with long correlation times. Unlike previous weak measurement experiments, our proposed scheme has no classical equivalent.