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Mechanical squeezing via parametric amplification and weak measurement.

A Szorkovszky¹, A C Doherty, G I Harris

¹Centre for Engineered Quantum Systems, University of Queensland, Australia. alexs@physics.uq.edu.au

Physical Review Letters

|December 21, 2011

Summary

This summary is machine-generated.

Researchers achieved quantum squeezing in mechanical oscillators below zero-point motion using parametric amplification with continuous measurement and feedback. This method offers unlimited steady-state squeezing, relaxing previous limitations.

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Area of Science:

Quantum mechanics
Mechanical oscillators
Nonlinear dynamics

Background:

Nonlinear forces enable mechanical oscillator motion below zero-point energy.
Mechanical parametric amplification is an accessible method for achieving quantum squeezing.
Previous methods were limited to 3 dB of steady-state squeezing.

Purpose of the Study:

To investigate the effect of continuous weak measurement and feedback on mechanical parametric amplification.
To explore methods for achieving unlimited steady-state quantum squeezing in mechanical oscillators.

Main Methods:

Applying continuous weak measurement and feedback to a mechanical parametric amplifier.
Optimally detuning the parametric drive from resonance.
Analyzing correlations between motion quadratures.

Main Results:

Unlimited steady-state squeezing is achievable when the parametric drive is optimally detuned.
Correlations between motion quadratures are key to overcoming previous squeezing limitations.
Measurement strength, temperature, and efficiency requirements are significantly relaxed compared to backaction evasion.

Conclusions:

Continuous weak measurement and feedback, combined with parametric amplification, can achieve unlimited quantum squeezing.
This approach offers a more accessible and less demanding route to quantum squeezing in mechanical systems.
The findings relax stringent experimental requirements, potentially broadening the applicability of quantum squeezing techniques.