Comparing nonlinear optomechanical coupling in membrane-in-the-middle and single-cavity optomechanical systems

Abstract

In cavity optomechanics, nonlinear interactions between an optical field and a mechanical resonator mode enable a variety of unique effects in classical and quantum measurement and information processing. Here, we describe nonlinear optomechanical coupling in the membrane-in-the-middle (MIM) setup in a way that allows direct comparison to the intrinsic optomechanical nonlinearity in a standard, single-cavity optomechanical system. We find that the enhancement of nonlinear optomechanical coupling in the MIM system as predicted by Ludwig et al. arXiv:1202.0532 is limited to the degree of sideband resolution of the system. Moreover, we show that the selectivity of the MIM system of nonlinear over linear transduction has the same limit as in a single cavity system. These findings put constraints on the experiments in which it is advantageous to use a MIM system. We discuss dynamical backaction effects in this system and find that these effects per cavity photon are exactly as strong as in a single cavity system, while allowing for reduction of the required input power. We propose using the nonlinear enhancement and reduced input power in realistic MIM systems towards parametric squeezing and heralding of phonon pairs, and evaluate the limits to the magnitude of both effects.

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• Accurate phonon blockade detector composed of a quadratically coupled optomechanical system
• Asymmetry-Based Quantum Backaction Suppression in Quadratic Optomechanics
• Enhancing the force sensitivity of squeezed light optomechanical interferometer
• Near-resonant nuclear spin detection with megahertz mechanical resonators
• Route to hyperchaos in quadratic optomechanics