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In a world in which we use devices that we do not necessarily trust, can there be any privacy? Yes, and that's precisely what device-independent quantum cryptography achieves. New work now shows how this ‘ultimate’ level of communication security could be reached in practise.

Ultrafast lasers with multi-gigahertz pulse-repetition rates are desirable for applications requiring high sampling rates or resolvable frequency-comb lines. ETH researchers have now solved one of the long-standing problems that has hindered progress towards gigahertz diode-pumped ultrafast solid-state lasers.

Experiments based on atoms in a shaken artificial crystal made of light offer novel insight into the physics of quantum many-body systems — which might help in the development of future data-storage technologies.

Scientists on the Dark Energy Survey (DES), to which ETH astronomers from the group of Alexandre Refregier contribute, announced today the public release of their first three years of data. The survey includes information on about 400 million astronomical objects.