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Measurement of the forces that arise from quantum vacuum fluctuations between closely spaced surfaces typically requires large apparatus, making applications difficult. Now, an experiment on a silicon chip to measure the Casimir force has been realized.
Weak coupling of light to the microscopic magnetic order in antiferromagnetic materials makes their optical characterization notoriously difficult. Now, a table-top magneto-optical technique has been developed for detecting the vector direction of antiparallel-aligned magnetic moments in a metallic antiferromagnet.
This Review covers optical clock networks that are established to synchronize remote optical clocks. Further upgrading of optical clock networks and their impact on a future redefinition of time are also discussed.
