Menu

Blog

Archive for the ‘quantum physics’ category: Page 595

Sep 5, 2019

IBM releases quantum computing textbook and video tutorials

Posted by in categories: computing, quantum physics

Programming a quantum computer is a rather different discipline than programming on traditional computers.

Sep 5, 2019

Future of LEDs gets boost from verification of localization states in InGaN quantum wells

Posted by in categories: computing, quantum physics

Light-emitting diodes made of indium gallium nitride provide better luminescence efficiency than many of the other materials used to create blue and green LEDs. But a big challenge of working with InGaN is its known dislocation density defects that make it difficult to understand its emission properties.

In the Journal of Applied Physics, researchers in China report an InGaN LED structure with high luminescence efficiency and what is believed to be the first direct observation of transition carriers between different localization states within InGaN. The localization states were confirmed by temperature-dependent photoluminescence and excitation power-dependent photoluminescence.

Localization states theory is commonly used to explain the high luminescence efficiency gained via the large number of dislocations within InGaN materials. Localization states are the energy minima states believed to exist within the InGaN quantum well region (discrete energy values), but a direct observation of localization states was elusive until now.

Sep 5, 2019

Scientists find new, long-hypothesized material state with signature of quantum disordered liquid-like magnetic moments

Posted by in categories: chemistry, quantum physics

The future of technology relies, to a great extent, on new materials, but the work of developing those materials begins years before any specific application for them is known. Stephen Wilson, a professor of materials in UC Santa Barbara’s College of Engineering, works in that “long before” realm, seeking to create new materials that exhibit desirable new states.

In the paper “Field-tunable quantum disordered in the triangular-lattice antiferromagnet NaYbO2,” published in the journal Nature Physics, Wilson and colleagues Leon Balents, of the campus’s Kavli Institute for Theoretical Physics, and Mark Sherwin, a professor in the Department of Physics, describe their discovery of a long-sought “” in the material NaYbO2 (sodium ytterbium oxide). The study was led by materials student Mitchell Bordelon and also involved physics students Chunxiao Liu, Marzieh Kavand and Yuanqi Lyu, and undergraduate chemistry student Lorenzo Posthuma, as well as collaborators at Boston College and at the U.S. National Institute of Standards and Technology.

At the atomic level, electrons in one material’s lattice structure behave differently, both individually and collectively, from those in another material. Specifically, the “spin,” or the electron’s intrinsic magnetic moment (akin to an innate bar magnet) and its tendency to communicate and coordinate with the magnetic moments of nearby electrons differs by material. Various types of spin systems and collective patterns of ordering of these moments are known to occur, and materials scientists are ever seeking new ones, including those that have been hypothesized but not yet shown to exist.

Sep 4, 2019

NASA tests ‘impossible’ no-fuel quantum space engine — and it actually works

Posted by in categories: quantum physics, space travel

NASA didn’t set out to confirm the feasibility of a seemingly impossible fuel-less thruster design, but it seems they did exactly that.

Sep 4, 2019

Egyptian Teenager Creates Next-Generation Quantum Space Propulsion System

Posted by in categories: quantum physics, space travel

An Egyptain teenager has patented a next-generation propulsion system that could send spacecraft to other solar systems—without using a single drop of fuel. While it is not quite warp-drive technology, young physicist Aisha Mustafa’s system is based on quantum physics and could see mankind boldly go where no man has gone before.

Sep 4, 2019

[PDF] The Gravitational Aether, Part II: Gravitational Aetherometry

Posted by in categories: energy, quantum physics

The present essay is the third of a group of four communications originally intended for publication in Infinite Energy at Dr. Eugene Mallove’s invitation, and dedicated to the scientific, technological and political problems presented by exotic flight and lift systems in particular those relating to possible control of gravity. We examine the main lines of research into the nature of gravity over the past 6 decades, with a focus on Einstein’s General Relativity and General Theory of Gravitation, quantum-mechanical models of the graviton, Geometrodynamics and the ZPE theories, Van Flandern’s model of gravity, which are contrasted to Aspden’s theory of a dynamic Aetherometric Theory of Synchronicity, Vol. II AS3-II.9.

Sep 4, 2019

Harnessing Zero-Point Energy

Posted by in categories: computing, mathematics, particle physics, quantum physics

From the fictional universe of Stargate Atlantis and Marvel Comic’s Realm of Kings to NASA’s Eagleworks Propulsion laboratory, zero-point energy, also known as vacuum energy, is touted as a potentially limitless and ubiquitous source of energy, if one can only find the means to harness it. [1] Zero-point energy can be formulated in a few different ways, but in its most basic form, it is the minimal yet non-zero energy of a quantum mechanical system. In quantum field theory, zero-point energy can be considered by computing the expected energy of the zero photon mode. [2] In a system with no physical boundaries, the expected energy of the zero photon mode diverges! Yet, if this energy uniformly permeates all of space-time, it is not directly observable.

Conceptual Framework

For pedagogical reasons, we will consider the popular formulation of zero-point energy. The most interesting and relevant framework for zero-point energy can be understood from the quantum field theory for photons and electrons: quantum electrodynamics. Glossing over an exceptional amount of mathematical and conceptual background, the energy of a state in quantum field theory is computed as an expectation of a Hamiltonian„ which describes the energy of the state in terms of operators acting on wavefunctions. The final computation usually requires an integral over the allowed momenta of particles in the state.

Sep 4, 2019

WTF is Zero Point Energy and How Could it Change the World?

Posted by in categories: energy, quantum physics

A strange concept of quantum physics could be an extraordinary boon to a ton of different near-undefined.

Sep 3, 2019

How quantum computing might go mainstream

Posted by in categories: computing, quantum physics

Dr. Chris Bernhardt, professor of mathematics at Fairfield University, tells Tonya Hall that quantum computing could eventually be useful for everyone through different problem solving processes.

Sep 2, 2019

A method to simulate strongly correlated phases of quantum gauge theories

Posted by in categories: mathematics, particle physics, quantum physics

Quantum gauge theories are mathematical constructs that are typically used by physicists to describe subatomic particles, their associated wave fields and the interactions between them. The dynamics outlined by these theories are difficult to compute, yet effectively emulating them in the lab could lead to valuable new insight and discoveries.

In a recent study, a team of researchers at ETH Zurich’s Institute for Quantum Electronics successfully implemented a fundamental ingredient for the simulation of quantum gauge theories in a laboratory experiment. Their hope is that by simulating in a highly controlled environment, they will gather interesting observations and broaden their understanding of many-body systems (i.e., systems with many particles that interact with each other).

“Usually, our work is inspired by phenomena in solid state physics such as strongly correlated phases of electrons in complex materials,” Tilman Esslinger, one of the researchers who carried out the study, told Phys.org. “In our current work, however, we wanted to extend the scope of our experimental platform (i.e., in optical lattices) in order to investigate a new set of phenomena occurring in high-energy and condensed matter physics. The objective was to demonstrate that it is possible to engineer gauge fields in our setup that are dynamical quantum degrees of freedom due to their coupling to a matter field.”