In a significant leap for the field of quantum mechanics and its practical applications, scientists at Oak Ridge National Laboratory (ORNL), managed by UT-Battelle for the Department of Energy's Office of Science, have developed a method that harnesses quantum mechanics to notably enhance the performance of sensing devices, a breakthrough with wide-reaching implications from medical diagnostics to the elusive search for dark matter, shared Oak Ridge National Laboratory in a release.
By exploring the peculiar characteristics of quantum light, the team has achieved greater sensing precision due to a quantum attribute known as "squeezed states," which exhibit lower noise levels than traditional light but also at the heart of the research is the parallel probing of multiple sensors a technique that has successfully increased sensitivity by 22% to 24% over classical methods, leveraging the correlations in both time and space to efficiently and simultaneously measure the changes within various sensing sites.
The research conducted in collaboration with the University of Oklahoma employs twin beams of light to independently and concurrently gauge shifts in refractive index across a quadrant plasmonic array composed of four individual sensors lined up in a square formation; this type of parallel measurement enables diverse research efforts such as improved imaging technologies and the exploration of dark matter in the universe which neither interacts with light nor can be detected with traditional sensors because of its fragile interaction with standard matter, according to ORNL's announcement.
"Typically, you use the fact that you have correlations in time and take advantage of noise levels below the classical limit, that is squeezing, to enhance a measurement and obtain a quantum enhancement," said ORNL researcher Alberto Marino, who also holds a joint faculty appointment at the University of Oklahoma, the research ushers in a new era where the goal is to extract significantly more information from systems all while gaining a quantum advantage, particularly in the field of dark matter detection, which will benefit from probing multiple sensors simultaneously now that the team is refining their techniques to maximize the number of independently quantum correlated regions, or coherence areas, used to examine each sensor in an array.
The ramifications of these advancements extend into practical applications such as the improved detection of various pathogens in blood by utilizing sensor arrays where each sensor could target a different pathogen, evolving how we approach complex biological and medical detections, Marino explained. This work not only charts a course for future sensing technologies but also represents the continued commitment of DOE's Office of Science to confront some of the most persistent and demanding scientific challenges of our era.
