Enhancing sideband cooling by feedback--controlled light

Abstract

We realise a phase-sensitive closed-loop control scheme to engineer the fluctuations of the pump field which drives an optomechanical system, and show that the corresponding cooling dynamics can be significantly improved. In particular, operating in the counter-intuitive "anti-squashing" regime of positive feedback and increased field fluctuations, sideband cooling of a nanomechanical membrane within an optical cavity can be improved by 7.5~dB with respect to the case without feedback. Close to the quantum regime of reduced thermal noise, such feedback-controlled light would allow going well below the quantum backaction cooling limit.

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• Emergence and enhancement of feedback control induced quantum entanglement
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• Selective cooling and squeezing in a lossy optomechanical closed loop embodying an exceptional surface
• Deterministic Equations for Feedback Control of Open Quantum Systems III: Full counting statistics for jump-based feedback
• Theoretical framework for enhancing or enabling cooling of a mechanical resonator via the anti-Stokes or Stokes interaction and zero-photon detection
• Active feedback cooling of a SiN membrane resonator by electrostatic actuation
• Electromechanics of Suspended Spiral Capacitors and Inductors
• Significant enhancement in refrigeration and entanglement in auxiliary-cavity-assisted optomechanical systems