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Nokia and Bristol University working on bringing quantum cryptography to the smartphone

Lumia 925

Nokia has joined forces with the University of Bristol in the UK to develop the first practical way of processing quantum cryptography on a mobile phone. What does this mean with a mini jargon buster? It would essentially enable you to send encrypted messages or data in secrecy. Currently utilised by banks and other organisations who can afford such expensive technology, the work carried out by Bristol University and Nokia could integrate simple client electronics on a single chip - perfect for a mobile phone.

Quantum Key Distribution (QKD) is a popular technique already being used commercially. The key is exchanged with knowledge that it will not have been read by an eavesdropper, simply because the key is transmitted in terms of quantum bits (qubits), which if intercepted and read are altered, revealing that someone has rather naughty. Nokia and the university have worked hard to get all this functionality on a single chip with inexpensive components.

The system developed by the teams at Nokia's Research Centre in Cambridge, UK uses a variant of QKD called reference frame independent QKD (rfiQKD), which was developed by Anthony Laing and several other team members. This will bring QKD one step closer to the average consumer and smartphones.

Instead of measuring the properties of photon qubits relative to a fixed reference frame, rfiQKD allows for some alterations (or twists), even if the relative motion is unknown. The technique works by computing a specific combination of observables where the effect of the twisting angle cancels itself out. When it falls between a certain threshold, alerts go off detecting an eavesdropper.

"First, the server creates a very weak pulse of light that is sent to the client using an optical fibre. The client takes the weak pulse and passes it through an attenuator, which outputs a single photon. The client then sets the polarization of the photon and sends it back to the server via the optical fibre. The server then measures the polarization of the photon. Then, the client and server compare their measurements using a conventional link, which allows them to extract both the cryptography key and the purity of the link."

Fear not if this is all going over your head. The technology will enable you to use quantum cryptography to protect personal information, passwords and other details that are sent to and from mobile phones. The technology has been patented by Bristol's CQP (Centre for Quantum Photonics) and Nokia. It'll be interesting to see how this technology develops and when we'll be seeing it implemented in smartphones. Head on over to Physicsworld for more details.

Source: physicsworld; thanks, Nishy, for the tip!


Reader comments

Nokia and Bristol University working on bringing quantum cryptography to the smartphone


I'd explain it to you. But if you couldn't comprehend the 6 other articles from WPCentral that have clearly explained the deal, I doubt I'll be able to get through to you.

Let's put it this way, Nokia is still an independent company with a well funded R&D department. One that has been working on a myriad of new technologies like this for months and years. This announcement is about a project that has been in the works for a long time and now has some fruit to show off. That's why they are showing it off because they can and should.

+1, wish we saw some of this innovation comming from Microsoft to the WP, especially now that they snagged Nokia's Mobile business.

Don't forget, the amazing Pelican camera technology and solar charging. I want a 10xx series with these added. That's why I'm waiting. I know solar will take a while, and if at least Pelican comes in the next 10xx series, I'll buy it for sure.

Feed the troll?? Who do you think you are calling me a troll. IM not perfect i no . But you should take a long look at yourselves. May after a good felling you will look better. I simply asked a question. Pricks

IM a big Nokia fan. I have been since the 90s. . I have lumia 800 920. 925. . I work all day. Its hard to keep up this week because there so mu h been happening. I ask a simple question and get called a troll.

I was thinking the same. Unless I'm missing something I would assume a form of emulator would be in effect or something that bridges the physical photons over the wire xfer.

And when is Microsoft going to bring Bitlocker to users?
iOS did that 6 freaking years ago.

Woah, what the hell? We are already sending cryptographic keys via quantum entanglement?
How the hell has this not been on every news site already?

I don't believe in secrecy and encryption for the average citizen anymore. And with MS owning Nokia the US and probably other governments will get the key for this super-fantastic-quantum thing.