Phys.org June 6, 2022
Quantum states of light have been shown to enhance precision in absorption estimation over classical strategies. However, most quantum sensing schemes rely on special entangled or squeezed states of light or matter that are hard to generate and detect. Researchers in the UK have shown it is possible to perform high precision measurements of important physical properties without the need for sophisticated quantum states of light and detection schemes. The key to this breakthrough is the use of ring resonators that guide light in a loop and maximize its interaction with the sample under study. Importantly, ring resonators can be mass manufactured using the same processes as the chips. Employing this technology to sense absorption or refractive index changes can be used to identify and characterize a wide range of materials and biochemical samples. The work brings us one step closer to all integrated photonic sensors operating at the limits of detection imposed by quantum mechanics… read more. TECHNICAL ARTICLEÂ