Security News > 2021 > June > Quantum communications reaching record distances

The Cambridge Research Laboratory of Toshiba Europe announced a demonstration of quantum communications over optical fibres exceeding 600 km in length.

The term quantum internet describes a global network of quantum computers connected by long distance quantum communication links.

One of the most difficult technological challenges in building the quantum internet, is the problem of how to transmit quantum bits over long optical fibres.

Record distances for quantum communications have been demonstrated by introducing a novel 'dual band' stabilisation technique.

"With the new techniques we have developed, further extensions of the communication distance for QKD are still possible and our solutions can also be applied to other quantum communications protocols and applications".

Rew Shields, Head of the Quantum Technology Division at Toshiba Europe remarks, "QKD has been used to secure metropolitan area networks in recent years. This latest advance extends the maximum span of a quantum link, so that it is possible to connect cities across countries and continents, without using trusted intermediate nodes. Implemented along with Satellite QKD, it will allow us to build a global network for quantum secured communications."

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