Quantum information science and technology (QIST) harnesses a burgeoning class of photonic devices, enabling the manipulation of quantum states in both light and matter for superior performance compared to classical technologies. While early-stage demonstrations in various areas of QIST have predominantly employed bulk-optic components, the imperative for integrated photonic devices becomes evident in the quest for scalability. This transition is crucial for substantial reductions in SWaP-C (Size, Weight, Power, and Cost) and is seen as essential for achieving the quantum advantage. This paper provides an overview of the evolution of classical and quantum light sources from bulk-optics to mini-bulk-optics to integrated photonics, examining their potential for scalable QIST deployments. While these components can greatly advance quantum computing, communication, sensing, and metrology, they also have readily shown promise in numerous classical technologies such as optical processors, LIDAR, and optical communications. This indicates the mutual dependence of QIST and integrated photonics for growth and fruition.
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