German scientists created a core technology of quantum Internet

German scientists created a core technology of quantum Internet

Scientists at the Max Planck Institute located in Germany made a breakthrough in quantum technologies. They managed to increase the storage time of qubits in an optical resonator to 100 ms. As the researchers report, it is enough to create and support the global network – the quantum Internet.

Light is a perfect carrier of quantum data but it isn’t effective for long-distance transfer. Therefore, the scientists agreed that the global quantum network needs direct teleportation between the points of signal transmission and reception. That is why quantum entanglement is used. However, here appears some difficulty – an arriving qubit can be inverted. Thus, it needs to remain stable – about 66 ms for nodes with a distance maximum possible on Earth.

The qubit storage method was developed as far back as 2011 by the team of Professor Rempe. However, they managed to keep qubits stable for only hundreds of microseconds. The experiment participant Stefan Langenfeld named the major peculiarity of a qubit – the correlation between overlapping wave functions. However, in the field environment, it is distorted by the fluctuations of magnetic fields.

The German scientists tried to affect the fluctuations. The moment quantum data transfers from a photon to an atom, an activated pair of lasers stimulates the Raman scattering and alter the atomic state. As a result, the qubit sensitivity to magnetic fluctuations decreases by 500 times, and the storage time increases to 100 ms.

According to the participant of the new experiment Matthias Körber, this technology plays key role in developing the quantum Internet. It goes without saying, a great deal of work is needed to create the methods of big data transmission. Nowadays, we have a core of this network.

Previously, the Austrian scientists created pioneer fully-fledged quantum routers. They are devices made from silicon resonators connected by laser rays. Quantum routers work perfectly at the 20 cm distance, and will so at several kilometers, the developers assure.