In situ three-dimensional strain engineering of solid-state quantum emitters in photonic structures towards scalable quantum networks

This is the authors' abstract. We don't add key points for this paper.

Solid-state quantum emitters are pivotal for modern photonic quantum technology, yet their inherent spectral inhomogeneity imposes a critical challenge in pursuing scalable quantum network. Here, we develop a cryogenic-compatible strain-engineering platform based on a polydimethylsiloxane (PDMS) stamp, which we show can also work properly at cryogenic temperature. In-situ three-dimensional (3D) strain control is achieved for quantum dots (QDs) embedded in photonic nanostructures. The compliant PDMS enables independent tuning of emission energy and strong reduction of fine structure splitting (FSS) of single QDs, as demonstrated by a 7 meV spectral shift with a near-vanishing FSS in circular Bragg resonators and an unprecedented 15 meV tuning range in the micropillar. The PDMS-based 3D strain-engineering platform, compatible with diverse photonic structures at cryogenic temperature, provides a powerful and versatile tool for exploring fundamental strain-related physics and advancing integrated photonic quantum technology. Spectral inhomogeneity of solid-state quantum emitters hinders their application in scalable quantum networks. Here the authors use in-situ 3D strain engineering at cryogenic temperatures to independently tune emission energy and suppress fine structure splitting in quantum dots embedded in photonic structures.