A versatile quantum playground with semiconductor quantum emitters

Solid-state quantum emitters such as quantum dots and color centers in crystals mimic atoms in nature as they spatially confine electrons in a nanoscale area and consequently have discrete energy levels. Therefore, solid-state quantum emitters can provide important quantum resources of photonic and spin qubits, which are basic building blocks for a range of quantum applications without complicated trapping setup. However, a solid-state environment also has several limitations, such as inevitable interaction with phonons and charges, low light extraction efficiency, and spectral randomness. With recent advances in the growth of quantum materials, integration of nanophotonic structures, coherent control techniques, and highly efficient single-photon detectors, these emitters have successfully demonstrated high-performance quantum light sources and quantum memories as well as a number of quantum applications such as quantum sensing and simulations. In particular, integrating quantum emitters into photonic cavities or waveguides has enabled scalable quantum interactions involving multiple photons and emitters. Given these high performance and scalability, quantum emitters are taking the next stages towards scalable, integrated quantum systems on photonic integrated circuits or fiber optics. Therefore, all quantum operations are efficiently possible in real-world photonic platforms. In this talk, I present recent races and future challenges in scalable, integrated quantum photonics.