Development of novel quantum optomechanical sensing devices in the search for dark matter in the universe.

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Observations across multiple astronomical scales point to the existence of an unknown type of matter in the universe called "dark matter"; a type of matter that has so far eluded conventional detection techniques. The proposed project consists in the development of novel quantum sensing devices to search for evidence of dark matter waves passing through the earth. The core enabling technology consists in the quantum-limited readout of mechanical motion in superfluid helium. To maximize the sensitivity of these novel quantum sensing devices, we will investigate the possibility to combine fiber optical cavities and ultralow-noise membranes and assemble a prototype system at McGill University. We will also study the potential ultimate sensitivity of these devices within a global geographically distributed array. The direct detection of dark matter would completely revolutionize our understanding of the universe. The proposed project will significantly contribute to both the advancement of fundamental knowledge and development of technological innovations in the disciplines of quantum optomechanics, quantum states of matter and particle physics. This proposal will also significantly extend and strongly complement the existing experimental research program at the world-class SNOLab underground laboratory facility in Sudbury, further strengthening Canada's position as a global leader in the search for dark matter. Finally, the proposed project will also provide unique training opportunities for highly qualified personnel in a particularly wide-ranging set of skills and knowledge at the leading-edge of both areas of particle physics and quantum sensing, aligned with the needs of research and industry in our knowledge-based economy.