Is quantum internet coming? High fidelity and long distance are its characteristics

The future quantum internet will be faster and more secure than the internet we're using now - and now such a network may be one step closer to reality. Scientists have used quantum teleportation to send information over long distances with higher fidelity than before.

It is reported that researchers from Fermilab, AT&T, Caltech, Harvard University, NASA JPL and the University of Calgary have demonstrated sustained and very precise long-distance quantum teleportation. The team achieved quantum teleportation with a fidelity greater than 90% for the first time over a distance of 44 kilometers. This is not the longest distance quantum teleportation has been achieved. In 2015, information was transmitted over 100 kilometers (62 miles) through optical fiber. In 2017, Chinese scientists completed a quantum entanglement experiment over a distance of 1,200 kilometers using the Micius satellite, breaking the record.

According to existing knowledge of physics, two or more particles can achieve quantum entanglement, where changing the state of one particle will immediately change the state of its "partner" - no matter how far apart they are. This mechanism can be used to create quantum networks. Pairs of photons can be entangled and separated, allowing data to be "teleported" between them over long distances. Therefore, quantum networks are more secure because any hacker who tries to read the data will be garbled.