Mr. Soroush Khademi Profile

Soroush Khademi

at Univ of Queensland

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Proceedings Article | 13 March 2024 Presentation

Preparing quantum states via continuous measurement

Warwick Bowen, Chao Meng, Soroush Khademi, Amy Navarathna, James Bennett

Proceedings Volume PC12912, PC129123K (2024) https://doi.org/10.1117/12.3012175

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In this presentation I will introduce a new approach to control the quantum state of a macroscopic mechanical resonator via measurement and conditioning. By operating in the fast measurement regime, we show that it is possible to prepare quantum squeezed states of motion. Remarkably, our theory predicts that the experimental requirements are greatly relaxed, even compared to mechanical ground-state cooling, to the point that quantum state preparation is feasible at room temperature with existing technology. I will present experiments showing a classical version of the predicted squeezing effect in a new engineered double-disk optomechanical device fabricated on a silicon chip. These experiments take advantage of both structural damping – which we show that, compared to the usual viscous damping, can improve quantum state preparation – and arrays of mechanical modes. Specifically, I will present experiments demonstrating that continuous position measurement can prepare thermomechanical squeezed states of motion, and to this for ensembles of structurally damped mechanical resonances.

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