Near threshold all-optical backaction amplifier

TL;DR

This paper demonstrates a near-threshold all-optical backaction amplifier with significantly improved gain and power efficiency, enabling potential quantum-limited measurements and squeezing at cryogenic temperatures.

Contribution

It introduces a novel integrated micronscale architecture achieving high gain and low power operation near threshold, surpassing previous all-optical implementations.

Findings

37 dB gain at 12 μW input power

Nearly three orders of magnitude improvement over prior work

Potential for quantum-limited measurements and squeezing

Abstract

A near threshold all-optical backaction amplifier is realized. Operating near threshold in an integrated micronscale architecture allows a nearly three orders of magnitude improvement in both gain and optical power requirements over the only previous all-optical implementation, with 37 dB of gain achieved for only 12 uW of input power. Minor adjustments to parameters allows optical filtering with narrow bandwidth dictated by the mechanical quality factor. Operation at cryogenic temperatures may enable standard quantum limit surpassing measurements and ponderomotive squeezing.