Squeezing of mechanical motion via qubit-assisted control

Abstract

We propose a feedback control mechanism for the squeezing of the phononic mode of a mechanical oscillator. We show how, under appropriate working conditions, a simple adiabatic approach is able to induce mechanical squeezing. We then go beyond the limitations of such a working point and demonstrate the stationary squeezing induced by using repeated measurements and re-initialisation of the state of a two-level system ancilla coupled to the oscillator. Our non-adaptive feedback loop offers interesting possibilities for quantum state engineering and steering in open-system scenarios.

13 pages, 7 figures

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• Probing of nonlinear hybrid optomechanical systems via partial accessibility
• Large mechanical squeezing beyond 3dB of hybrid atom-optomechanical systems in highly unresolved sideband regime
• Unconditional mechanical squeezing via back-action evading measurements and non-optimal feedback control
• Shortcuts to Squeezed Thermal States
• Single and two-mode mechanical squeezing of an optically levitated nanodiamond via dressed-state coherence
• Nonclassical correlations and quadrature squeezing of photons in anisotropic quantum Rabi-Stark model
• Nonclassical Photon-Bundle Correlations in Quantum Rabi Models