Der Takt unserer Zeit wird in Braunschweig vorgegeben. Normale
Quarzuhren gehen im Monat um einige Sekunden falsch, heutige Atomuhren weichen
dagegen erst nach 100 Millionen Jahren um eine Sekunde von der Idealzeit ab. Gleich
vier Atomuhren laufen bei der Physikalisch Technischen Bundesanstalt (PTB),
inzwischen arbeiten die Wissenschaftler an der nächsten Generation, die noch hundertmal
genauer geht. Herzstück dieser optischen Uhren ist eine so genannte Ionenfalle,
in der geladene Atome, mit einem elektromagnetischen Feld gefangen und mit
Hilfe von Lasern kontrolliert werden.
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