Search

Single-photon emitters are an essential component of quantum networks, and defects or impurities in semiconductors are a promising platform to realize such quantum emitters. Here, we present a model that encapsulates the essential physics of coupling to phonons, which governs the behavior of real single-photon emitters, and critically evaluate several approximations that are commonly utilized. Emission in the telecom wavelength range is highly desirable, but our model shows that nonradiative processes are greatly enhanced at these low photon energies, leading to a decrease in efficiency. Our results suggest that reducing the phonon frequency is a fruitful avenue to enhance the efficiency.

In recent years, quantum-dot-like single-photon emitters in atomically thin van der Waals materials have become a promising platform for future on-chip scalable quantum light sources with unique advantages over existing technologies, notably the potential for site-specific engineering. However, the required cryogenic temperatures for the functionality of these sources has been an inhibitor of their full potential. Existing methods to create emitters in 2D materials face fundamental challenges in extending the working temperature while maintaining the emitter's fabrication yield and purity. In this work, we demonstrate a method of creating site-controlled single-photon emitters in atomically thin WSe2 with high yield utilizing independent and simultaneous strain engineering via nanoscale stressors and defect engineering via electron-beam irradiation. Many of the emitters exhibit biexciton cascaded emission, single-photon purities above 95%, and working temperatures up to 150 K. This methodology, coupled with possible plasmonic or optical micro-cavity integration, furthers the realization of scalable, room-temperature, and high-quality 2D single- and entangled-photon sources.

Integrated photonics is at the heart of many classical technologies, fromoptical communications to biosensors, LIDAR, and data center fiberinterconnects. There is strong evidence that these integrated technologies willplay a key role in quantum systems as they grow from few-qubit prototypes totens of thousands of qubits. The underlying laser and optical quantumtechnologies, with the required functionality and performance, can only berealized through the integration of these components onto quantum photonicintegrated circuits (QPICs) with accompanying electronics. In the last decade,remarkable advances in quantum photonic integration and a dramatic reduction inoptical losses have enabled benchtop experiments to be scaled down to prototypechips with improvements in efficiency, robustness, and key performance metrics.The reduction in size, weight, power, and improvement in stability that will beenabled by QPICs will play a key role in increasing the degree of complexityand scale in quantum demonstrations. In the next decade, with sustainedresearch, development, and investment in the quantum photonic ecosystem (i.e.PIC-based platforms, devices and circuits, fabrication and integrationprocesses, packaging, and testing and benchmarking), we will witness thetransition from single- and few-function prototypes to the large-scaleintegration of multi-functional and reconfigurable QPICs that will define howinformation is processed, stored, transmitted, and utilized for quantumcomputing, communications, metrology, and sensing. This roadmap highlights thecurrent progress in the field of integrated quantum photonics, futurechallenges, and advances in science and technology needed to meet thesechallenges.

Integrated photonics is at the heart of many classical technologies, fromoptical communications to biosensors, LIDAR, and data center fiberinterconnects. There is strong evidence that these integrated technologies willplay a key role in quantum systems as they grow from few-qubit prototypes totens of thousands of qubits. The underlying laser and optical quantumtechnologies, with the required functionality and performance, can only berealized through the integration of these components onto quantum photonicintegrated circuits (QPICs) with accompanying electronics. In the last decade,remarkable advances in quantum photonic integration and a dramatic reduction inoptical losses have enabled benchtop experiments to be scaled down to prototypechips with improvements in efficiency, robustness, and key performance metrics.The reduction in size, weight, power, and improvement in stability that will beenabled by QPICs will play a key role in increasing the degree of complexityand scale in quantum demonstrations. In the next decade, with sustainedresearch, development, and investment in the quantum photonic ecosystem (i.e.PIC-based platforms, devices and circuits, fabrication and integrationprocesses, packaging, and testing and benchmarking), we will witness thetransition from single- and few-function prototypes to the large-scaleintegration of multi-functional and reconfigurable QPICs that will define howinformation is processed, stored, transmitted, and utilized for quantumcomputing, communications, metrology, and sensing. This roadmap highlights thecurrent progress in the field of integrated quantum photonics, futurechallenges, and advances in science and technology needed to meet thesechallenges.

In recent years, quantum-dot-like single-photon emitters in atomically thin van der Waals materials have become a promising platform for future on-chip scalable quantum light sources with unique advantages over existing technologies, notably the potential for site-specific engineering. However, the required cryogenic temperatures for the functionality of these sources has been an inhibitor of their full potential. Existing methods to create emitters in 2D materials face fundamental challenges in extending the working temperature while maintaining the emitter's fabrication yield and purity. In this work, we demonstrate a method of creating site-controlled single-photon emitters in atomically thin WSe2 with high yield utilizing independent and simultaneous strain engineering via nanoscale stressors and defect engineering via electron-beam irradiation. Many of the emitters exhibit biexciton cascaded emission, single-photon purities above 95%, and working temperatures up to 150 K. This methodology, coupled with possible plasmonic or optical micro-cavity integration, furthers the realization of scalable, room-temperature, and high-quality 2D single- and entangled-photon sources.