Optical clocks might become more compact and even portable, maybe in the future even travel to space. Scientists of the Physikalisch-Technische Bundesanstalt have shown how some fundamental difficulties, which a more simple set-up had previously hindered, could be avoided (see current edition of "Physical Review Letters"). In the next step they want to build such a clock. This clock could help to determine geographical heights more exactly than before. ...> Full Article
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