A team in the US has for the first time achieved quantum teleportation over 30 kilometres of fibre-optic cable already carrying internet data traffic, says a study published in the journal Optica. This type of teleportation would allow quantum communication to be combined with existing internet cable infrastructure.
A team of physicists led by Harvard University (USA) has succeeded in linking two quantum memory nodes 35 kilometres apart using existing fibre optics in the Boston area (USA). This is the longest distance achieved to date. According to the authors, who publish their results in the journal Nature, ‘demonstrating that quantum network nodes can intertwine in the real-world environment of a busy urban area is an important step towards practical networking between quantum computers’.
A team of researchers, led by IBM's Thomas J. Watson Center, has shown that a quantum computer can already help in the calculation of practical scientific problems that are inaccessible to today's classical computers. The "noise" and errors that accumulate still limit the applications of such computers, but the new study shows that, after adding a protocol that reduces these problems, a 127-cubit quantum computer is capable of simulating extremely complex physical states with high reliability. The results are published in the journal Nature.
The journal Nature publishes a quantum simulation of a holographic wormhole on a quantum processor. The demonstration, carried out with the Google Sycamore processor, represents a further step towards the possibility of studying quantum gravity in the laboratory.
The Royal Swedish Academy of Sciences has awarded the Nobel Prize in Physics to Alain Aspect, John F. Clauser and Anton Zeilinger for their experiments with entangled photons, establishing the violation of Bell's inequalities and becoming pioneers in quantum information science.
A 'quantum internet' would allow, among other things, the flow of inviolable secret messages. Building such a network involves teleporting information between non-interacting elements of the system, something researchers in the Netherlands claim to have achieved. They publish it in Nature.