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Here you will find the news as well as a short guide to PTB


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Megacoole Nachricht für die Welt der Metrologie: Es gibt neue Einheiten-Vorsätze (Präfixe) für extrem große und extrem kleine Zahlenangaben: Ronna und Quetta sowie ronto und quecto. Die Bekanntheit von Mega (eine Million) oder milli (ein Tausendstel) werden sie sicherlich nicht so schnell erreichen. Aber die Erweiterung war beispielsweise deshalb notwendig, weil durch die Digitalisierung die weltweiten Datenmengen exponentiell wachsen. Hier werden schon jetzt die Präfixe am oberen Ende der bestehenden Skala verwendet. Präfixe für sehr kleine Zahlen sind  für die Quantenwissenschaft und die Teilchenphysik sehr nützlich, betont die Physikalisch-Technische Bundesanstalt (PTB), die als nationales Metrologieinstitut die oberste Instanz in Deutschland für alle Fragen des richtigen und zuverlässigen Messens ist.

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Optische Atomuhr mit hochgeladenen Ionen

Optical atomic clocks are the most accurate measuring instruments ever built and are becoming key tools for basic and applied research, for example to test the constancy of natural constants or for height measurements in geodesy. Now, researchers at the QUEST Institute at the Physikalisch-Technische Bundesanstalt (PTB), in collaboration with the Max Planck Institute for Nuclear Physics (MPIK) and the TU Braunschweig and in the scope of the QuantumFrontiers Cluster of Excellence, have realised for the first time an optical atomic clock based on highly charged ions. This type of ion lends itself to such an application because it has extraordinary atomic properties and low sensitivity to external electromagnetic fields. The researchers report on their results in the current issue of Nature.

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A brief introduction to PTB

Entrance of PTB Braunschweig

Here in a nutshell are a few Opens internal link in current windowFacts about PTB, or read the current facts and figures from the Opens internal link in current windowAnnual Report. If you want more details, here you will find a Opens internal link in current windowDescription of Tasks of PTB. Furthermore, we recommend our general Info Sheet about PTB which you can download in the right-hand column as a pdf file.

Important research topics

The SI with its 7 base units
In the new International System of Units (SI), seven fundamental constants are determined as defining reference values. (Diagram: PTB)

We present you with an overview of PTB's diverse research landscape as well as some especially highlighted topics in the chapter l Opens internal link in current windowResearch & Development, including the key strategic points in European metrology research (Opens internal link in current windowChallenges and Prospects) as well as the various success stories surrounding Opens internal link in current windowPTB's Technology Transfer. How firmly PTB is integrated in the international research landscape you can see briefly, on the one hand, in the Opens internal link in current windowOverview and, on the other hand, we individually present the respective research institutes of the worldwide metrology landscape in the chapter Opens internal link in current windowInternational Affairs.


Evaluation report (in Geman only)
Stand: Januar 2012

In 2002, PTB as a whole was evaluated – with an excellent outcome. In 2008, an evaluation of PTB research followed, carried out by the Wissenschaftsrat (German Council of Science and Humanities) with a subsequent Implementation Report in 2012. You will find more about this at Opens internal link in current windowPTB in the World of Research or in the pdfs of the evaluation reports which you can download in the right-hand column.

The next evaluation will follow in 2016.