Atomic clock comparison via data highways (artwork)
(Credit: MPQ + woogie-works Wien)
A team of researchers from the Physikalisch-TechnischeBundesanstalt (PTB) in Braunschweig and from the Laser Spectroscopy Division at the Max Planck Institute of Quantum Optics (MPQ) in Garching have now demonstrated an optical frequency transfer with high stability through a standard telecommunication optical fiber network (Science, April 27, 2012). The optical fiber connecting the two institutes was installed below ground and had a total length of 920 kilometres.This demonstration enables the ability to compare optical clocks located far apart from each other and to transmit their stability to distant laboratories where the signals can be used for high precision experiments. At first, fundamental research will benefit from this, e.g. in the precise determination of natural constants, tests of the validity of Einstein’s theory of General Relativity or for predictions in quantum electrodynamics.
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