Quantum Tech

A group of scientists from ITMO University, in Saint Petersburg, has developed a novel approach to the construction of quantum communication systems for secure data exchange. The experimental device based on the results of the research is capable of transmitting single-photon quantum signals across distances of 250 kilometers or more, which is on par with other cutting edge analogues. The research paper was published in the Optics Express journal...

Quantum physics has moved from theoretical thought experiments to becoming a reality in advanced laboratories, and the next step is to develop quantum technology for commercial use, such as quantum information technology. In a major effort to translate quantum physics into practical quantum technology, the Danish Innovation Fund has invested 80m kr. in a nationwide project involving three universities.

Quantum physics is no longer theoretical thought experiments, it is real experiments in laboratories and the next step is to develop quantum technology for commercial use, such as quantum information technology. In a major new effort to translate quantum physics into practical quantum technology, the Innovation Fund Denmark has therefore invested 80 million kroner in a nationwide project involving three universities: the Niels Bohr Institute at t...

Australian researchers from The University of Queensland have, for the first time, used laser light to cool a special form of quantum liquid, called a superfluid. Lasers are widely used to cool gases and solid objects, but have never before been applied to cool a quantum liquid. The findings were released today in the journal Nature Physics. Superfluids are quantum liquids with a strange property - much like electrical current...

A method of implementing an 'unbreakable' quantum cryptographic system is able to transmit information at rates more than ten times faster than previous attempts. Researchers have developed a new method to overcome one of the main issues in implementing a quantum cryptography system, raising the prospect of a useable 'unbreakable' method for sending sensitive information hidden inside particles of light.

An international research group observed a state in copper oxides in which orbital degrees of freedom did not freeze at low temperatures and electrons fluctuated due to quantum fluctuations. The group also clarified the time scale of these quantum fluctuations in multifrequency electron spin resonance (ESR) experiments in a strong magnetic field for the first time. Electrons have three degrees of freedom: spin, orbital, and electric charge.

A University of Oklahoma-led team of physicists believes chip-based atomic physics holds promise to make the second quantum revolution—the engineering of quantum matter with arbitrary precision—a reality. With recent technological advances in fabrication and trapping, hybrid quantum systems are emerging as ideal platforms for a diverse range of studies in quantum control, quantum simulation and computing.

The quantum mechanical entanglement of particles plays an important role in many technical applications. To date, however, the effect has been difficult to measure experimentally. Physicists from the Technical University of Munich (TUM), the University of Innsbruck and the Institute of Photonic Sciences (ICFO) in Barcelona have now developed a new protocol to detect entanglement of many-particle quantum states using established measuring methods.

Physicists have developed a new protocol to detect entanglement of many-particle quantum states using a much easier approach. The new protocol, now published in Nature Physics, is particularly interesting for characterising entanglement in systems involving many particles. These systems could help us not only to improve our understanding of matter but to develop measurement techniques beyond current existing technologies.

Builders of future superconducting quantum computers could learn a thing or two from semiconductors, according to a report in Nature Communications. By leveraging the good ideas of the natural world and the semiconductor community, researchers may be able to greatly simplify the operation of quantum devices built from superconductors. They call this a "semiconductor-inspired" approach and suggest that it can provide a useful guide to improving su...