Lifeboat Foundation

Get ready to get excited about excitons.

Excitons are quirky quasiparticles that exist only in semiconducting and insulating materials. Recently, a team of researchers in Lausanne, Switzerland discovered a way to control how excitons flow. Not only that, they also discovered new properties of the particles which they claim could lead to a new generation of electronic devices with transistors that lose less energy as heat. The results of their study were published this week in the journal Nature Photonics.

Rice University physicists have created the world’s first laser-cooled neutral plasma, completing a 20-year quest that sets the stage for simulators that re-create exotic states of matter found inside Jupiter and white dwarf stars.

The findings are detailed this week in the journal Science and involve new techniques for laser cooling clouds of rapidly expanding plasma to temperatures about 50 times colder than deep space.

Continue reading “Next up: Ultracold simulators of super-dense stars” »

What shape is an electron? The answer, believe it or not, has implications for our understanding of the entire universe, and could reveal whether there are mysterious particles still to be discovered.

The Cray-1 supercomputer, the world’s fastest back in the 1970s, does not look like a supercomputer. It looks like a mod version of that carnival ride The Round Up, the one where you stand, strapped in, as it dizzies you up. It’s surrounded by a padded bench that conceals its power supplies, like a cake donut, if the hole was capable of providing insights about nuclear weapons.

After Seymour Cray first built this computer, he gave Los Alamos National Laboratory a six-month free trial. But during that half-year, a funny thing happened: The computer experienced 152 unattributable memory errors. Later, researchers would learn that cosmic-ray neutrons can slam into processor parts, corrupting their data. The higher you are, and the bigger your computers, the more significant a problem this is. And Los Alamos—7,300 feet up and home to some of the world’s swankiest processors—is a prime target.

The world has changed a lot since then, and so have computers. But space has not. And so Los Alamos has had to adapt—having its engineers account for space particles in its hard- and software. “This is not really a problem we’re having,” explains Nathan DeBardeleben of the High Performance Computing Design group. “It’s a problem we’re keeping at bay.”

Continue reading “Cosmic Ray Showers Crash Supercomputers. Here’s What to Do About It” »

On his 125th birth anniversary, ThePrint celebrates one of India’s greatest physicists.

New Delhi: Bose-Einstein statistics, Bose-Einstein Condensate, Bosons — these are terms that even casual observers of physics have heard regardless of whether they actually know about them or not. These nomenclatures, based upon Satyendra Nath Bose’s surname (along with Einstein’s in the first two cases), both commemorate and signify his immense contribution to physics.

Bose’s novel derivation of Planck’s formula without relying upon classical electrodynamics resolved a conceptual inconsistency which had troubled all famous scientists of the day.

Continue reading “Birthday tribute to Satyendra Nath Bose, the physicist after whom Higgs boson particle is named” »

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Researchers from MIT and elsewhere have recorded, for the first time, the “temporal coherence” of a graphene qubit—meaning how long it can maintain a special state that allows it to represent two logical states simultaneously. The demonstration, which used a new kind of graphene-based qubit, represents a critical step forward for practical quantum computing, the researchers say.

Superconducting quantum bits (simply, qubits) are artificial atoms that use various methods to produce bits of quantum information, the fundamental component of quantum computers. Similar to traditional binary circuits in computers, qubits can maintain one of two states corresponding to the classic binary bits, a 0 or 1. But these qubits can also be a superposition of both states simultaneously, which could allow quantum computers to solve complex problems that are practically impossible for traditional computers.

The amount of time that these qubits stay in this superposition state is referred to as their “coherence time.” The longer the coherence time, the greater the ability for the qubit to compute complex problems.

In a recent publication in Science, researchers at the University of Paderborn and the Fritz Haber Institute Berlin demonstrated their ability to observe electrons’ movements during a chemical reaction. Researchers have long studied the atomic-scale processes that govern chemical reactions, but were never before able to observe electron motions as they happened.

New kinds of messengers from the distant universe are joining the photons collected by telescopes—and revealing what light can’t show. So-called multimessenger astrophysics got started with high-speed particles called cosmic rays and gravitational waves, the ripples in space-time first detected in 2015 that Science named Breakthrough of the Year in 2016. This year, another messenger has joined the party: neutrinos, tiny, almost massless particles that are extraordinarily hard to detect.

Snaring one of these extra-galactic will-o’-the-wisps took a cubic kilometer of ice deep below the South Pole, festooned with light detectors to record the faint flash triggered—very rarely—by a neutrino. Known as IceCube, the massive detector has logged many neutrinos before, some from outside the Milky Way, but none had been pinned to a particular cosmic source. Then, on 22 September 2017, a neutrino collided with a nucleus in the ice, and the light sensors got a good fix on the direction it had come from.

An alert sent out to other telescopes produced, after a few days, a match. As the researchers reported in July, NASA’s Fermi Gamma-ray Space Telescope found an intensely bright source known as a blazar right where the neutrino appeared to come from. A blazar is the heart of a galaxy centered on a supermassive black hole, whose gravity heats up gas swirling around it, causing the material to glow brightly and fire jets of particles out of the maelstrom.