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Using an Atomic Nucleus for Precise Time Measurement

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Using an Atomic Nucleus for Precise Time Measurement

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  • Author: Thorsten Schumm
The current definition of time uses a transition between two atomic energy levels in cesium to determine with relatively high precision how long a second lasts. Cesium atoms are indistinguishable quantum particles and are therefore completely identical all over the world which offers a totally reproducible system and is therefore ideal as a frequency/time standard. One of the most essential tools for manipulating atoms is the Laser since it allows e.g. the output of light with a very exact frequency or pulses with very short duration.

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