Dutch scientists laid the foundation for the “quantum Internet”

Dutch Scientists Laid The Foundation For The Quantum Internet

Scientists at Delft University of Technology successfully brought two electrons three meters apart into a quantum mechanical entangled state. This brings the quantum network that “transmits” information closer.

Quantum entanglement: fascinating, but at the same time very complicated. In short, it boils down to the fact that two particles can be entangled to merge the “identities” of these particles. The result is that two particles-no matter how far apart they are-always appear as a whole.

Quantum entanglement is very interesting because it allows computers to perform many calculations simultaneously. For example, a quantum computer with 400 computing units (or 400 qubits) can simultaneously process more information bits than there are atoms in the universe.

On two chips
No wonder scientists all over the world are trying to control quantum entanglement. Researchers have previously shown that it is possible to interweave qubits on a chip. Researchers at Delft University of Technology have now taken a step forward. They showed that it is possible to interweave qubits located on two different chips.

How does it work?
Researchers at Delft University of Technology make qubits by using electrons in diamonds. “We use diamond because if there is a nitrogen atom instead of one of the carbon atoms, it will create’mini prisoners’ for electrons,” the researcher Ronald Hanson explained. “Since we can view these prisoners individually, it is possible to study and control a single electron or even an atomic nucleus. We can prepare the spin (direction of rotation) of these particles in a predetermined state, check the spin, and then read it out. We Use materials that can make chips to complete all of these tasks. This is important because many people think that we can only extend chip-based systems to practical technologies.” What the researchers need to do now is to place two electrons A few meters of different diamonds) are placed in an entangled state. The two electrons cannot “feel” each other because they are too far apart. To convey entanglement, the researchers used light particles.

Far internet

This research is an important step towards the quantum internet: a network with which quantum computers can communicate with each other. Obviously, this kind of communication can run super fast. “We have expanded the experiment with more qubits per chip. Such a network can connect quantum computers through entanglement.” Another big advantage of the quantum internet is that information is sent via teleportation, so it cannot be intercepted. “In the invisible transmission, the information will not pass through the intermediate space, so it will not be eavesdropped.”

After that, the method must still be proven effective. To this end, the researchers studied the spin states of two electrons. The spin direction of each electron is completely random. This is not surprising: this is the way prescribed by quantum mechanics. However, the spin directions of the two electrons are always completely opposite-proving that they are entangled and appear as a whole.

Greater distance
As mentioned earlier, the distance between two entangled particles is now about three meters. However, this does not mean the maximum distance at which two particles can be entangled. “The distance of three meters between the electrons has been arbitrarily chosen. We can also conduct this experiment at a greater distance.”

Hansen emphasized that although the experiment is impressive, we have not yet arrived. The next step is to transfer. “Through clever use of entanglement, it is theoretically possible to “transmit” the state of one particle to another particle at a long distance. Quantum teleportation does not move matter, but its state. But because all elementary particles are exactly the same, Quantum teleportation from one electron to another electron has the same effect as moving electrons.”