All articles tagged with #quantum metrology
The article discusses advancements in quantum-amplified global-phase spectroscopy on optical clock transitions, highlighting recent developments in quantum metrology and atomic clock technology, including enhanced stability and precision through quantum entanglement and squeezing techniques.
Researchers have demonstrated the first direct observations of an optical-lattice clock operating below the classical quantum projection noise (QPN) limit, averaging down to a measurement precision level of 10−17. By entangling the atomic sample, the researchers were able to reduce the QPN limit and improve the frequency stability of optical lattice clocks, which can be used for practical applications such as GPS and exploring fundamental physics. This represents a major step toward improving state-of-the-art optical lattice clocks through spin squeezing.
Physicists at the University of Basel have shown that the Einstein-Podolsky-Rosen paradox still holds even when scaled up to a larger system using Bose-Einstein condensates. The experiment involved generating a cloud of rubidium-87 atoms, forcing them to become an entangled Bose-Einstein condensate, and then releasing the condensate into two separate clouds where the pseudospins were entangled. The properties of the two clouds could not be correlated in a way attributable to chance, suggesting that the EPR paradox holds even when scaled up. The experiment could serve as a template for conducting other quantum metrology applications.