Integrated photonic quantum technologies (IQP) have advanced significantly in the past decade, enabling the generation, processing, and detection of quantum states of light at increasing scale and complexity. IQP leverages integrated photonic circuits to achieve high-fidelity quantum information processing, secure quantum communications, and quantum simulations. Key components include integrated single-photon sources (SPSs), detectors, and quantum circuits, which enable versatile quantum applications such as quantum key distribution (QKD), Boson sampling, and quantum simulations of physical and chemical systems. IQP platforms include materials like silicon, silicon nitride, and lithium niobate, each offering unique advantages for quantum state generation and manipulation. Integrated SPSs, such as parametric photon-pair sources and quantum dot sources, enable the generation of high-quality single photons, while integrated detectors like superconducting nanowire single-photon detectors (SNSPDs) provide high efficiency and low noise. These components are essential for on-chip quantum information processing and communication. Chip-based quantum communications have demonstrated secure key distribution using integrated photonic circuits, with protocols like BB84 and entanglement-based QKD. Integrated IQP systems have achieved high key rates and low quantum bit error rates, showing promise for practical quantum communication networks. Additionally, IQP has enabled the implementation of quantum algorithms, such as Shor's factoring algorithm and Grover's search algorithm, demonstrating the potential of photonic quantum computing. Quantum simulation using IQP has shown success in modeling complex quantum systems, including molecular ground-state energy and vibrational dynamics. Boson sampling, a quantum computing task, has been implemented using integrated photonic circuits, with recent advancements in scattershot Boson sampling and high-efficiency quantum dot-based Boson sampling. These developments highlight the potential of IQP for achieving quantum advantage in specific tasks. Despite progress, challenges remain in scaling IQP systems, improving photon generation and detection efficiency, and achieving full integration of quantum sources, circuits, and detectors. However, the compatibility of IQP with CMOS fabrication processes and the availability of wafer-scale integration offer promising pathways for future quantum technologies. The continued development of IQP is expected to enable large-scale quantum photonic circuits, paving the way for revolutionary advancements in quantum communication, information processing, and simulation.Integrated photonic quantum technologies (IQP) have advanced significantly in the past decade, enabling the generation, processing, and detection of quantum states of light at increasing scale and complexity. IQP leverages integrated photonic circuits to achieve high-fidelity quantum information processing, secure quantum communications, and quantum simulations. Key components include integrated single-photon sources (SPSs), detectors, and quantum circuits, which enable versatile quantum applications such as quantum key distribution (QKD), Boson sampling, and quantum simulations of physical and chemical systems. IQP platforms include materials like silicon, silicon nitride, and lithium niobate, each offering unique advantages for quantum state generation and manipulation. Integrated SPSs, such as parametric photon-pair sources and quantum dot sources, enable the generation of high-quality single photons, while integrated detectors like superconducting nanowire single-photon detectors (SNSPDs) provide high efficiency and low noise. These components are essential for on-chip quantum information processing and communication. Chip-based quantum communications have demonstrated secure key distribution using integrated photonic circuits, with protocols like BB84 and entanglement-based QKD. Integrated IQP systems have achieved high key rates and low quantum bit error rates, showing promise for practical quantum communication networks. Additionally, IQP has enabled the implementation of quantum algorithms, such as Shor's factoring algorithm and Grover's search algorithm, demonstrating the potential of photonic quantum computing. Quantum simulation using IQP has shown success in modeling complex quantum systems, including molecular ground-state energy and vibrational dynamics. Boson sampling, a quantum computing task, has been implemented using integrated photonic circuits, with recent advancements in scattershot Boson sampling and high-efficiency quantum dot-based Boson sampling. These developments highlight the potential of IQP for achieving quantum advantage in specific tasks. Despite progress, challenges remain in scaling IQP systems, improving photon generation and detection efficiency, and achieving full integration of quantum sources, circuits, and detectors. However, the compatibility of IQP with CMOS fabrication processes and the availability of wafer-scale integration offer promising pathways for future quantum technologies. The continued development of IQP is expected to enable large-scale quantum photonic circuits, paving the way for revolutionary advancements in quantum communication, information processing, and simulation.