Getting better all the time: JILA strontium atomic clock sets new records

23-Apr-2015 - In another advance at the far frontiers of timekeeping by National Institute of Standards and Technology (NIST) researchers, the latest modification of a record-setting strontium atomic clock has achieved precision and stability levels that now mean the clock would neither gain nor lose one ...

Thousands of atoms entangled with a single photon

Result could make atomic clocks more accurate

27-Mar-2015 - Physicists from MIT and the University of Belgrade have developed a new technique that can successfully entangle 3,000 atoms using only a single photon. The results, published in the journal Nature, represent the largest number of particles that have ever been mutually entangled experimentally. ...

Top-precision optical atomic clock starts ticking

04-Mar-2015 - A state-of-the-art optical atomic clock, collaboratively developed by scientists from the University of Warsaw, Jagiellonian University, and Nicolaus Copernicus University, is now "ticking away" at the National Laboratory of Atomic, Molecular and Optical Physics in Torun, Poland. As the first of ...

The fundamental constants are still constant

Atomic clocks prove the stability of the mass ratio of protons to electrons

20-Nov-2014 - Are the fundamental constants really constant? Recent investigations carried out at the Physikalisch-Technische Bundesanstalt (PTB) have shown that one essential fundamental constant - namely the mass ratio of protons to electrons - can have changed only by a maximum of one part in a million over ...