Information Coding

Alvaro Alarcón, Joakim Argillander and Guilherme B Xavier in the lab at LiU.

A more robust quantum communication

Senior lecturer Guilherme Xavier founded a laboratory of quantum technologies at LiU in 2018. His research group’s new results could make help quantum communication over long distances more robust.

Picture of an optical fibre launching light in a photonic integrated silicon chip at the quantum technologies laboratory at LiU.

Major progress towards high-dimensional quantum communication

A quantum mechanical random generator that functions with high security has been developed by a research group in which LiU researcher Guilherme Xavier is a member. The result opens the way for high-dimensional quantum communication.

Jonathan Jogenfors och Niklas Johansson i labbet

Quantum computers and photonics to attract students

“We have seen increasing interest from students for quantum computers, quantum cryptography and photonics, says Jan-Åke Larsson, who has taken the initiative to a new profile within Applied Physics and Electrical Engineering.

Swedish Research Council grant for secure quantum communication

The Swedish Research Council has awarded SEK 1.4 million to SECRET, a European collaborative project to increase security in quantum communication. The project, with a budget of EUR 340,000, will be coordinated by LiU researcher Guilherme Xavier.

Spreading light over quantum computers

Scientists at Linköping University have managed to simulate quantum computer properties in a classical computer. “Our results should be highly significant in determining how to build quantum computers”, says Professor Jan-Åke Larsson.

The results of the Big Bell Test are in

3,283 people in Sweden, among them pupils at Katedralskolan in Linköping, participated in a huge experiment that challenged Einstein’s ideas about how the world works on the scale of quantum mechanics. The results have now been published in Nature.

Hacking the unhackable

Jonathan Jogenfors’ doctoral thesis discusses security in what many people consider to be the most secure system of all – quantum cryptography. And it explains how to fix the holes he found.

Niklas Johansson, Oier Saizar och Jonathan Jogenfors

A course in hacking computers

Jonathan Jogenfors and Niklas Johansson wanted to offer something different, so they designed the practical exercises for a course in computer security as a game, a competition in which points were awarded at different levels.

Organic electronics can use power from socket

Organic light-emitting devices and printed electronics can be connected to a socket in the wall by way of a small, inexpensive organic converter, developed in a collaboration between Linköping University and Umeå University.

Bell-testet samlade drygt 109 000 deltagare

109,000 Bell test participants

Can atoms talk to each other? This is the question posed by Swedish radio programme “Vetandets värld”, after the BIG Bell test collected no less than 95 million ones and zeros from more than 109,000 participants, 3,283 of them in Sweden.

Testuppställning för undervisning i kvantkryptering

Help researchers in The BIG Bell Test

In a large number of identical experiments conducted at nine locations worldwide, the ability of people to act unpredictably will be used in an experiment in quantum physics. LiU is the Swedish node of the experiment

Jan-Åke Larsson, professor i informationskodning

The Big Bell Test

The experiment of the century is to be repeated, but this time using people as random number generators and at the same time in many places around the world. It will now be decided once and for all whether Albert Einstein or Niels Bohr was right.

LiU-researchers reveal security hole

Quantum cryptography is considered a fully secure encryption method, but researchers from LiU and Stockholm University have discovered that this is not always the case.

'Spooky action at a distance' exists

Jan-Åke Larsson, professor of information coding at LiU, is part of the research group that proved that what Albert Einstein dismissed as ‘spooky action at a distance’ actually exists. “This is the experiment of the century,” he says.