Indistinguishable quantum optomechanical devices protected by topology

The last ten years have witnessed micro‐ and nanofabricated optomechanical devices developing as a new promising platform for quantum information processing. Lots of exciting quantum optomechanical experiments have emerged, including entanglement, quantum transduction, and squeezing. These advances stimulated giant effort of quantum optomechanics to build a scalable quantum network by using distributed optomechanical devices. Indistinguishable quantum devices, which have the same operating frequencies, are one of the key elements for a scalable quantum network. However, fabrication imperfections have inhibited the deterministic generation of indistinguishable optomechanical devices. Topology offers a solution for wave systems dealing with disorders, and it has been proven to protect some optical or mechanical devices from disturbance of geometry imperfections. Here, we propose to use the idea of topology to realize indistinguishable optomechanical resonant devices by making both the co‐localized optical and mechanical modes topologically protected. We will test the experimental boundary of topological protection in bosonic resonators in the quantum regime. Our results can be a benchmark for building large‐scale optomechanical quantum networks.