KRISS remeasures strontium frequency with 50x better precision

The Korea Research Institute of Standards and Science (KRISS) has remeasured a key transition frequency of the strontium atom for the first time since 1938 using a photonic grating chip. Measurement uncertainty dropped more than 50-fold, providing an accurate reference for atomic clocks and neutral-atom quantum computers. The work is published in Metrologia.

• Strontium transition frequency had not been remeasured in 88 years
• Measurement uncertainty reduced by more than 50 times
• A photonic grating chip was used for the measurement
• Results target atomic clocks and neutral-atom quantum computers