In 2014, for the first time, a group of scientists managed to achieve 100% guaranteed safe teleportation of qubits, and now, 8 years later, Sophie Hermans and his colleagues, a group of researchers from Delft University of Technologyin the Netherlands, was able to take another step towards the quantum internet.

For the first time, they were able to use quantum teleportation to transfer information between qubits that were at a great distance from each other. That is, they were able to transfer stored information over a long distance if there were any losses along the way.

Of course, when we talk about teleportation, we automatically look for references that we have in live action films and video games, which is not so far from what has been done in research, except that they are not dealing with matter, but only c Information.

However, the importance here is that unlike the regular Internet as we know it, this one does not travel through the space between them, which would make it nearly impossible to intercept, making it a big step towards quantum cryptography to be used in the future.

How is teleportation carried out?

The qubits are embedded in diamonds, and for them to work in this experiment, the following ingredients were required: a quantum entanglement link between sender and receiver, as well as a secure way to read qubits and their ability to temporarily store the values ​​of each of these qubits. .

For the test, the team used three diamonds with qubits that could store information for a longer period of time, with each of the diamonds given a name and a function: Alice, Bob, and Charlie.

And in order for the teleportation to work, the first step is to create an entanglement between Alice and Charlie, who, despite not having any physical connection to Bob, are both directly connected. After obfuscation is complete, Bob will store his data and create an obfuscation state with Charlie, and then send his state further. In short, when Alice and Charlie are intertwined and Bob sends information about his condition, the teleporter is ready to go.

The next step is to create the message to be sent, the quantum bit. What in this case is done in Charlie and the message can be a value from 1 to 0 or any other intermediate quantum variable. And to make sure the teleportation worked, the researchers repeatedly experimented with different values.

The last stage of the experiment is Charlie’s teleportation to Alice, where Charlie makes a joint measurement with the message in his quantum processor and his other half of the entangled state, in which case Alice has the other half of that state. It is during this measurement process that the information that is close to Charlie is then teleported to Alice’s side.

Quantum Internet

The curious thing here is that during the transmission process, the sent quantum bit is encrypted, and its key is the result of Charlie’s measurement. Then, according to the study:

“Charlie then sends the result of the measurement to Alice, after which Alice performs the appropriate quantum operation to decrypt the quantum bit. For example, with a bit flip, 0 becomes 1 and 1 becomes 0. After Alice has performed the correct operation, the quantum information is usable. The teleportation was successful!”

The team is now looking to find ways to get information back so they can create an unrestricted flow of sending and receiving information with the highest possible security, and “Therefore, in the long term, this type of teleportation will serve as the basis of the quantum Internet.”

The full study was published in the scientific journal Nature and can be read here.

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Via: Quantum Insider