When will rural areas get fast-speed fibre internet?

Some fibre is laid on overhead cables with a view Continue reading the main storyRelated StoriesRural broadband gets green lightBroadband providers launch appealRural areas 'should be priority' In the picturesque village of St Agnes in Cornwall, you can't get a mobile telephone signal unless you jump up and down in the middle of the road but you can get super-fast broadband, offering speeds of up to 100Mbps (megabits per second).

By June 2014, the majority of the county and the neighbouring Scilly Isles will be enjoying the same, thanks to a network being laid by BT, funded in part by the European Regional Development Fund.

What is much more unclear is whether that can be replicated around the rest of the country.

Developments in Cornwall are being keenly watched by BDUK - Broadband Delivery UK - the group set up to oversee rural broadband rollout in the UK.

It has allocated every council in the UK a pot of money to help them build similar fibre networks. Councils must choose someone to lay it and provide some cash to fund it.

So far only a handful of councils have chosen a supplier - and BT has won in every case, in most cases it has been the sole bidder.

BT's dominance may mean that the whole project - which requires state aid approval from the EU - could be considered anti-competitive.

Even if approval is given soon and each council begins rollouts, the Cornish example suggests that the government could still fall short of its target to have universal broadband by 2015.

BT began its Cornish deployment in 2010 and will not complete it until 2014.

"The later the start, the harder it will be to finish by a fixed end date," said Ranulf Scarborough, BT's director of Superfast Cornwall.

Wine club

Those living in areas with poor or non-existent broadband are getting fed up with waiting.

Continue reading the main storySUPERFAST CORNWALL By 2014, up to 90% of homes will have a fibre connection Cornwall is the EU's largest ever single investment in supefast broadband It is providing up to

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Quantum code sent on common fibre

Thousands of kilometres of existing fibre may be used to carry quantum codes Continue reading the main storyRelated StoriesUncrackable codes get flash trickTricking the perfect code machine'Unbreakable' encryption unveiled The "uncrackable codes" made by exploiting the branch of physics called quantum mechanics have been sent down kilometres of standard broadband fibre.

This "quantum key distribution" has until now needed a dedicated fibre separate from that used to carry data.

But a new technique reported in Physical Review X shows how to unpick normal data streams from the much fainter, more delicate quantum signal.

It may see the current best encryption used in many businesses and even homes.

The quantum key distribution or QKD idea is based on the sharing of a key between two parties - a small string of data that can be used as the basis for encoding much larger amounts.

Continue reading the main story“Start QuoteCertainly in a corporate environment it's already affordable, and as time goes on I'm sure we'll see the technology get cheaper”End QuoteAndrew ShieldsToshiba Cambridge Research Centre Tiny, faint pulses of laser light are used in a bid to make single photons - the fundamental units of light - with a given alignment, or polarisation. Two different polarisations can act like the 0s and 1s of normal digital data, forming a means to share a cryptographic key.

What makes it secure is that once single photons have been observed, they are irrevocably changed. An eavesdropper trying to intercept the key would be found out.

Sending these faint, delicate quantum keys has until now been done on dedicated, so-called "dark fibres", with no other light signals present.

That is an inherently costly prospect for users who have to install or lease a separate fibre.

So researchers have been trying to work out how to pull off the trick using standard, "lit" fibres racing with data pulses of millions of photons.

Slice of time

Now Andrew Shields of Toshiba's Cambridge Research Laboratory and his colleagues have hit on the solution: plucking the quantum key photons out of the fibre by only looking in a tiny slice of time.

Dr Shields and his team developed detectors fit to catch just one photon at a time, as well as a "gate" that opens for just a tenth of a billionth of a second - at just the time the quantum key signal photons arrive, one by one.

The team achieved megabit-per-second quantum key data rates, all the while gathering gigabit-per-second standard data.

"Trying to use such low-level signals over 'lit fibre' has been rather like trying to see the stars whilst staring at the Sun," said computer security expert Alan Woodward from the University of Surrey.

"What these researchers have developed is to use a technique that rapidly switches between the various light sources using the fibre such that one source isn't swamping the other," he told BBC News.

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