Month: November 2019

NA61/SHINE gives neutrino experiments a helping hand

Neutrinos are the lightest of all the known particles that have mass. Yet their behavior as they travel could help answer one of the greatest puzzles in physics: why the present-day universe is made mostly of matter when the Big Bang should have produced equal amounts of matter and antimatter. In two recent papers, the NA61/SHINE collaboration reports particle measurements that are crucial for accelerator-based experiments studying such neutrino behavior.

read more
New algorithms to determine eigenstates and thermal states on quantum computers

Determining the quantum mechanical behavior of many interacting particles is essential to solving important problems in a variety of scientific fields, including physics, chemistry and mathematics. For instance, in order to describe the electronic structure of materials and molecules, researchers first need to find the ground, excited and thermal states of the Born-Oppenheimer Hamiltonian approximation. In quantum chemistry, the Born-Oppenheimer approximation is the assumption that electronic and nuclear motions in molecules can be separated.

read more
Researchers find potential solution to overheating mobile phones

Modern computer memory encodes information by switching magnetic bits within devices. Now, a ground-breaking study conducted by researchers from NUS Electrical and Computer Engineering has found a new efficient way of using ‘spin waves’ to switch magnetization at room temperature for more energy-efficient spin memory and logic devices.

read more
Superconductivity theory under attack

Measurements on a superconducting material show an abrupt transition between a normal metal and a “strange” metal. The really strange thing, however, is that this abruptness disappears when the temperature falls. “We don’t have any theoretical machinery for this,” says theoretical physicist Jan Zaanen, coauthor of a Science article, “this is something that only a quantum computer can calculate.”

read more
Adiabatic shortcuts: Short and sweet in the quantum world

Completing a task slowly and carefully may provide us with a high-quality product. It can be summed up by the popular adage “easy does it.” But what if a high price has to be paid for slowness? Time is a scarce resource and, what is more, a good result is not guaranteed, since we may be easily disturbed or interrupted by various matters and events if we take too long. So it is clear that we are often interested in doing things well but also quickly. A contradictory adage illustrates this for us once again: “short and sweet.” This everyday notion can also be applied in physics laboratories and especially when handling systems, such as natural or artificial atoms that physicists and engineers use to try and create new quantum technologies designed make calculations that are currently impossible, and achieve secure, spy-proof communications, sensors with unprecedented sensitivities, and ultra-precise measurements of time and other dimensions.

read more
Thermo-chemical power generation integrated with forced convection cooling

Scientists at Tokyo Institute of Technology combine forced convection cooling with thermo-electrochemical energy conversion to create a self-sustaining liquid cooling system. A liquid electrolyte is circulated through a cell to cool a hot object, and the reversible chemical reaction in the cell generates a higher electric power than the hydrodynamic pump work required to drive the liquid through the cell. This technology resolves the longstanding unaddressed issue of the loss of free energy component of the thermal energy.

read more

Copyright © All right reserved.