![]() ![]() ![]() The quintessential marriage between state-of-the-art nanofabrication techniques and quantum optics gives birth to quantum photonics, which provides essential scalability towards practical quantum applications. Exploiting photons as quantum bits (qubits), quantum technologies have witnessed substantial advances in quantum networks, quantum simulation, and computation. Photons are capable of carrying information over long distances. Finally, we provide an outlook of employing quantum-dot platforms for practical applications in large-scale quantum computation and the quantum Internet. We summarize the recent development of integrated photonics and reconfigurable devices that have been combined with quantum dots or are suitable for hybrid integration. We highlight two interfaces-one between flying photons and the quantum-dot dipole, and the other between the photons and the spin. In this review, we introduce the basis of epitaxial quantum dots and discuss their applications as non-classical light sources. Integrating a quantum dot into a carefully engineered photonic cavity enables control of the radiative decay rate using the Purcell effect and the realization of photon–photon nonlinear gates. Their semiconductor nature allows for a straightforward combination with mature integrated photonic technologies, leading to novel functional devices at the single-photon level. Epitaxial quantum dots formed by III–V compound semiconductors are excellent sources of non-classical photons, creating single photons and entangled multi-photon states on demand. ![]()
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