Ms. Wenhua He Profile

Wenhua He

at Wyant College of Optical Sciences

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Proceedings Article | 13 March 2024 Presentation + Paper

Towards imaging-based quantum optomechanics

Christian Pluchar, Wenhua He, Morgan Choi, Jack Manley, Nico Deshler, Saikat Guha, Dalziel Wilson

Proceedings Volume 12912, 129120S (2024) https://doi.org/10.1117/12.3001998

KEYWORDS: Quantum measurement, Optomechanical design, Reflection, Quantum limits, Quantum fields, Quantum amplitude, Photodetectors, Quantum optics experiments, Quantum noise, Interference (communication)

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Quantum optomechanics has led to advances in quantum sensing, optical manipulation of mechanical systems, and macroscopic quantum physics. However, previous studies have typically focused on dispersive optomechanical coupling, which modifies the phase of the light field. Here, we discuss recent advances in “imaging-based” quantum optomechanics – where information about the mechanical resonator’s motion is imprinted onto the spatial mode of the optical field, akin to how information encoded in an image. Additionally, we find radiation pressure backaction, a phenomenon not usually discussed in imaging studies, comes from spatially uncorrelated fluctuations of the optical field. First, we examine a simple thought experiment in which the displacement of a membrane resonator can be measured by extracting the amplitude of specific spatial modes. Torsion modes are naturally measured with this coupling and are interesting for applications such as precision torque sensing, tests of gravity, and measurements of angular displacement at and beyond the standard quantum limit. As an experimental demonstration, we measure the angular displacement of the torsion mode of a Si₃N₄ nanoribbon near the quantum imprecision limit using both an optical lever and a spatial mode demultiplexer. Finally, we discuss the potential for future imaging-based quantum optomechanics experiments, including observing pondermotive squeezing of different spatial modes and quantum back-action evasion in angular displacement measurements.

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