WINQ seminar: Jack Clarke

Jack is working on the theory of pulsed optomechanics for measurements and cooling, and is currently finishing up his PhD at Imperial College London in the Quantum Measurement Lab, led by Michael Vanner . You can check out Jack's work on his Google Scholar page .

Title: Nonlinear Cavity Quantum Optomechanics in the Unresolved Sideband Regime   Abstract: Utilizing nonlinearities has enabled rapid advancements in many different areas of quantum science, including quantum-information processing, quantum metrology, and nonclassical quantum state engineering. In cavity quantum optomechanics, there are now a growing number of unresolved-sideband experiments that cannot be described by the commonly employed the linearized approximation. A suitable theoretical framework for describing these nonlinear optomechanics experiments is needed for optomechanics to advance beyond the current state-of-the-art. In this talk, I will discuss our framework of cavity quantum optomechanics that captures the full nonlinearity of the cavity optomechanical interaction, including radiation pressure and the role of the cavity itself [1]. I will then discuss how this framework may be utilized to perform position measurement well beyond the breakdown of the commonly employed linearized approximation. Finally, I will discuss our upcoming results which show that with only radiation pressure in a cavity, mechanical Wigner negativity can be prepared deterministically in the unresolved sideband regime. [1] J. Clarke, P. Neveu, K. E. Khosla, E. Verhagen, and M. R. Vanner, Phys. Rev. Lett. 131, 053601 (2023).