Marta Maria Marchese - Coherently Averaged Optmechanical Sensing

Abstract: Coherent averaging schemes have been introduced as a method to achieve the Heisenberg limit in parameter estimation. Typically, these schemes involve multiple probes in a product state interacting with a quantum bus, with parameter estimation performed via measurements on the bus. We propose a novel coherent averaging scheme for force sensing using an array of optomechanical detectors. Our setup consists of N optomechanical cavities, unidirectionally coupled via an input laser pulse in the stroboscopic regime. The goal is to detect some weak unknown force that couples with all the mechanical elements within the cavities. Before being read out, the pulse sequentially passes through all the cavities, accumulating phase shifts, which encode information about the force. Potential applications of this approach include the sensing of gravitational fields at the Large Hadron Collider (LHC), the detection of dark matter signatures, and the measurement of effects predicted by potential collapse models.
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3C-QFS, 29 October 2024