Japanese machine can perform more than 415 quadrillion computations a second and has already worked out how breath droplets spread.
Trapped Rydberg ions can be the next step towards scaling up quantum computers to sizes where they can be practically usable, a new study in Nature shows.
Different physical systems can be used to make a quantum computer. Trapped ions that form a crystal have led the research field for years, but when the system is scaled up to large ion crystals this method gets very slow. Complex arithmetic operations cannot be performed fast enough before the stored quantum information decays.
A Stockholm University research group may have solved this problem by using giant Rydberg ions, 100 million times larger than normal atoms or ions. These huge ions are highly interactive and, therefore, can exchange quantum information in less than a microsecond.
With a new nanoparticle that converts light to heat, a team of researchers has found a promising technology for clearing water of pollutants.
Trace amounts of contaminants such as pesticides, pharmaceuticals and perfluorooctanoic acid in drinking water sources have posed significant health risks to humans in recent years. These micropollutants have eluded conventional treatment processes, but certain chemical processes that typically involve ozone, hydrogen peroxide or UV light have proven effective. These processes, however, can be expensive and energy-intensive.
A new nanoparticle created by Yale University engineers as part of an effort for the Rice-based Nanosystems Engineering Research Center for Nanotechnology-Enabled Water Treatment (NEWT) could lead to technologies that get around those limitations. The particle is described in a study published this week in the Proceedings of the National Academy of Sciences.
Fifty is a critical number for quantum computers capable of solving problems that classic supercomputers cannot solve. Proving quantum supremacy requires at least 50 qubits. For quantum computers working with light, it is equally necessary to have at least 50 photons. And what’s more, these photons have to be perfect, or else they will worsen their own quantum capabilities. It is this perfection that makes it hard to realize. Not impossible, however, which scientists of the University of Twente have demonstrated by proposing modifications of the crystal structure inside existing light sources. Their findings are published in Physical Review A.
Photons are promising in the world of quantum computing, with its demands of entanglement, superposition and interference. These are properties of qubits, as well. They enable building a computer that operates in a way that is entirely different from making calculations with standard bits that represent ones and zeroes. For many years now, researchers have predicted quantum computers able to solve very complex problems, like instantly calculating all vibrations in a complex molecule.
The first proof of quantum supremacy is already there, accomplished with superconducting qubits and on very complicated theoretical problems. About 50 quantum building blocks are needed as a minimum, whether they are in the form of photons or qubits. Using photons may have advantages over qubits: They can operate at room temperatures and they are more stable. There is one important condition: the photons have to be perfect in order to get to the critical number of 50. In their new paper, UT scientists have now demonstrated that this is feasible.
Massive object cannot be explained without changing our understanding of what we know about astrophysics, researchers say.
A Russian submarine passed through Turkey on Tuesday, in an apparent breach of the longstanding Montreux Convention, which prohibits submarines from moving between the Black Sea and the Mediterranean. If the move goes unchecked it could change the balance of power in the region, making Russia more powerful in the Mediterranean.
The submarine was photographed by Yörük Işık, a highly respected ship spotter who lives in Istanbul. There is no mistaking that this is a Kilo Class submarine. Only Russia operates this type of submarine in the Black Sea. Romania also has a sole example on its lists but that hasn’t been active in decades so it cannot be that.
More specifically, the submarine is likely to be the Project 636.3 boat Rostov-on-Don, heading to take up duty in Syria. Russian state media reported on April 27 that the sub would be dispatched on a “deployment in distant waters” to the Mediterranean. Analysis of open-source intelligence suggests that she put to sea briefly after the announcement but then returned to her base on April 29. This was likely to start a pre-deployment COVID-19 isolation. She then participated in the Victory Day parade in Sevastopol, Crimea. She did not actually head south toward the Mediterranean until now.
Without a DNA sequencer, two Los Angeles entomologists relied on two of biology’s oldest tools: microscopes and lots of free time.
