Tag

Quantum Metrology

All articles tagged with #quantum metrology

science1 month ago•6 min saved

Thorium-229 Nuclear Clocks Demonstrate Standalone Timekeeping and New Physics Probes

Two independent teams in Europe and China built functional nuclear clocks using thorium-229 nuclei in calcium fluoride crystals, achieving stand-alone operation and highly reproducible ticking. While not yet beating the best electronic atomic clocks, these devices could offer greater environmental stability and enable new tests of fundamental physics, including dark matter interactions and possible variations in fundamental constants.

via ScienceAlert|

#atomic-clock #dark-matter #nuclear-clock

science9 months ago•7 min saved

Quantum Techniques Boost Precision of Optical Atomic Clocks

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.

via Nature|

#atomic-clocks #optical-clock #phase-amplification

science-and-technology3 years ago•3 min saved

Record Precision Achieved in Direct Comparison of Spin-Squeezed Optical Lattice Clocks.

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.

via Phys.org|

#optical-lattice-clocks #precision-measurement #quantum-metrology

physics3 years ago•2 min saved

Scaling up the Einstein-Podolsky-Rosen paradox with massive tests.

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.

via Phys.org|

#bose-einstein-condensates #entanglement #epr-paradox