- Apr 13, 2020
- Reaction score
- Area-51 sub level 28
The experiment brings us closer to a faster and more secure Internet.
The researchers bypassed the classic method of data transfer where you send an information-bearing photon between two chips. Instead, they teleported information from one silicon chip to another utilizing a quantum-mechanically entangled photon pair.
Photons connected in an entangled quantum state know each other’s characteristics at any time. A change in the state of one immediately results in a similar change in the other.
This peculiar relationship can be used to exchange quantum information between the locations where the entangled photons are sent. In the long run, this approach could one day be used to develop completely secure internet connections.
Even today, quantum physics can be employed to send very secretive messages that no other party can be privy to. The technology is still in its infancy but that hasn't stopped companies from offering equipment for quantum mechanical exchange of encryption keys.
In these cases, however, a direct optical fiber link is needed between the two parties wanting to send secret messages. This means there are physical limitations to how long such a link can be.
For users hundreds of kilometers apart, the distance issue can be solved through the use of a so-called trusted node. However, this is not without setbacks: it makes the connection slower, more expensive, and less secure.
A safer more reliable infrastructure for quantum communication between a large number of users is needed. This is where the researchers’ recent demonstration of chip-to-chip quantum teleportation comes in.