At QuTech they have taken a new step towards the quantum Internet.
Quantum computing and the Internet are very promising advances, although they are still far from reality. A first step towards the future has recently come through the first Teleportation of quantum information, which is a step towards the creation of this type of ultrafast networks.
A team led by Delf University of Technology (Netherlands), according to an article published in Naturegot quantum information teleportation between two nodes not closethrough a third party.
The power of a quantum internet relies on the ability to send information between network nodes, for example share sensitive information securely or connect more machines to increase their computing capacity.
A quantum Internet – which is not expected to emerge for another ten years – will be a large-scale network connecting users through unprecedented applications “impossible to deal with the classical web,” explained Ronald Hanson, of the University of Delft (The Netherlands), co-author of these works.
Those qubit they exploit the laws of quantum physics, which govern the world on an infinitely small scale. One of these properties is entanglement, a rare phenomenon for which two tangled particles behave identicallybeyond the distance that separates them: as if they were tied by an invisible thread.
The state of one entangled qubit is so shared with the other, and their coordination is so perfect that one speaks of teleportation: in theory, any change in the properties of one instantly changes those of the other, even at the other end of the qubit. galaxy.
As if by magic, the quantum bit disappears on the sender side and appears on the receiver side. Not needing to travel through the space in between, no chance to lose.
Being able to teleport quantum bits, as well as an intertwined quantum link between sender and receiver. a reliable method for reading quantum processors and the ability to buffer bits is required.
From Charlie to Alice
The study explains how to “move” quantum bits from a named node “Charlie” to another nominated “Alice”with the help of an intermediary, who was baptized as “Bob”.
To achieve this, one must first prepare for “teleportation”, which means creating an intertwined state between Alice and Charlie, who have no physical connection, but are both related to Bob.
To do this, Alice and Bob create an interlocked state between their processors and create another with Charlie. At that moment what the University of Delf calls a “sleight of hand” in quantum mechanics is performed.
The second step is to create the “message” – the quantum bit – to be teleported. It can be, for example, a “1” or a “0” or more intermediate quantum values. Charlie prepares this quantum information.
Finally, the information is teleported, for which Charlie makes a joint measurement with the message in his quantum processor and his half of the entangled state (Alice has the other half).
what happens then “It is only possible in the quantum world”As a result of this measurement, highlights the statement, the information disappears from Charlie’s side and immediately appears on Alice’s.
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Source: Clarin
