Nanowerk April 17, 2023
The quantum light sources developed so far have relied on external bulky excitation lasers, making them impractical prototype devices that are not reproducible, hindering their scalability and transfer out of the laboratory into real-world applications. An international team of researchers (Germany, the Netherlands) demonstrated a fully integrated quantum light source that overcame these challenges through the integration of a laser cavity, a highly efficient tunable noise suppression filter and a nonlinear microring for entangled photon-pair generation through spontaneous four-wave mixing. The hybrid quantum source employed an electrically pumped InP gain section and a Si3N4 low-loss microring filter system, and demonstrated high performance parameters. The source directly created high-dimensional frequency-bin entangled quantum states (qubits/qudits). According to the researchers their approach, leveraging a hybrid photonic platform, enables scalable, commercially viable, low-cost, compact, lightweight and field-deployable entangled quantum sources, quintessential for practical, out-of-laboratory applications such as in quantum processors and quantum satellite communications systems… read more. Open Access TECHNICAL ARTICLE
Performance characteristics of the quantum light source. Credit: Nature Photonics, 17 April 2023