The quantum Internet is already close


A quantum network can teleport information between independent nodes using quantum entanglement . Ronald Hanson from Delft University of Technology in the Netherlands and his colleagues built a simple network of several diamond qubits combined into three nodes with the names Alice, Bob and Charlie. There was no direct connection between Alice and Charlie, but only an indirect one, passing through Bob. Alice and Charlie had a common quantum entanglement, that is, to change the state of one node, you need to change the state of the other. When Charlie’s quantum state changed, Alice’s state also changed, that is, information was “teleported” through Bob without passing through him.

“This is a real teleportation, like in sci-fi movies. The state or information really disappears on one side and appears on the other, and since they don’t move in the space between two points, the data can’t get lost either.”Hanson said.

The use of entanglement has been theoretically possible for decades, but now it has been successfully demonstrated because the qubits in the nodes include “memory” qubits that can hold quantum states for longer than standard qubits.

Building a quantum Internet does not increase the speed compared to a conventional system, even if two nodes in the network change at the same time. This is due to the fact that users must exchange information about changes in the network using traditional, non-quantum communication. The quantum network offers eavesdropping-protected communications or data servers that will never be able to detect the data source being processed. According to Hanson, scientists have yet to explore many applications.

“It is very important to conduct such experiments on different platforms. We don’t know yet which technology will be successful. Perhaps it will be some kind of hybrid of different technologies”Charles Adams of Durham University said.

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