Noise Squeezing in a Nanomechanical Duffing Resonator

TL;DR

This paper demonstrates noise squeezing and mechanical amplification in a nonlinear nanomechanical resonator using phase-sensitive detection near its bifurcation point, revealing control over noise levels through local oscillator phase.

Contribution

It introduces a method to achieve noise squeezing in a nanomechanical Duffing resonator via phase-sensitive homodyne detection near bifurcation.

Findings

Successful noise squeezing observed through phase control

Enhanced mechanical amplification near bifurcation point

Potential for improved signal-to-noise in nanomechanical systems

Abstract

We study mechanical amplification and noise squeezing in a nonlinear nanomechanical resonator driven by an intense pump near its dynamical bifurcation point, namely, the onset of Duffing bistability. Phase sensitive amplification is achieved by a homodyne detection scheme, where the displacement detector's output, which has correlated spectrum around the pump frequency, is down converted by mixing with a local oscillator operating at the pump frequency with an adjustable phase. The down converted signal at the mixer's output could be either amplified or deamplified, yielding noise squeezing, depending on the local oscillator phase.