This acts as a network-based backup and synchronisation system for Apple's smartphones and tablets.

BBC: Fifth iPhone expected to be launched by Apple

The aim was to recreate the voice without the viewer being aware of any synchronisation - a bit like magic or an illusion.

BBC: Magazine

"The point is we can find a compromise, there are possibilities of leaving the time open for synchronisation in the future, " she said.

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It has e-mail, internet and synchronisation with your PC.

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"This is a work of synchronisation, " he said.

BBC: Particle beams injected into LHC

They stole information from a research version of a system made by ID Quantique, a Swiss firm that is trying to commercialise quantum cryptography, by taking advantage of synchronisation signals that pass between Alice and Bob.

ECONOMIST: Secure cryptography is only as safe as its weakest link

This synchronisation is hard to explain.

ECONOMIST: All fall down