A new study opens the door to cutting-edge solutions that could contribute to the realization of a system capable of processing quantum information in a simple yet powerful way.
Physicists at RIKEN have demonstrated how ultrafast, low-power-consumption memory devices could be realized by replacing conventional magnetic materials with novel ones.
A research team has successfully achieved an atomically controlled insulator-to-metal transition in iridate/manganate heterostructures. Their findings were recently published in Nature Communications.
A team of computer engineers from the National Institute of Information and Communications Technology, NTT Corporation and Nagoya University have developed what they claim is the world’s first superconducting flux qubit that can operate without the need for a surrounding magnetic field.
First coherent picture of an atomic nucleus made of quarks and gluons.
For the first time, quarks and gluons were used to describe properties of atomic nuclei, which until now had been explained by the existence of protons and neutrons. The temporary pair of correlated nucleons is highlighted in purple. (Source: IFJ PAN)
The atomic nucleus is made up of protons and neutrons, particles that exist through the interaction of quarks bonded by gluons. It would seem, therefore, that it should not be difficult to reproduce all the properties of atomic nuclei hitherto observed in nuclear experiments using only quarks and gluons. However, it is only now that physicists, including those from the Institute of Nuclear Physics of the Polish Academy of Sciences in Cracow, have succeeded in doing this.
The fabric of spacetime is four-dimensional, with three for space and only one for time. But wow, time sure is different from space!
ORNL’s breakthrough boosts 3D-printed turbine blades, reducing carbon emissions.
Researchers have made significant efforts to enable additively manufactured turbine blades to better handle extreme temperatures. They have developed and 3D printed the lightest crack-free alloy capable of operating without melting at temperatures above 2,400 degrees Fahrenheit.
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Our very own Milky Way could host a huge bridge in space-time. At least, that’s what the authors of a recent study have suggested. According to the group, teamwork between Indian, Italian, North American scientists and scientists from other countries at the International School for Advanced Studies (SISSA) in Italy.
The central disk of Milky Way may host the necessary dark matter to support the formation and nourishment of a “stable and controllable” tunnel to a distant section of space-time –known as a wormhole. The group’s study was issued in the November 2014 issue of Annals of Physics. A pre-print of this research paper is also available at arxiv.org.
Wormholes (also known as Einstein-Rosen Bridge) were first theorized by Albert Einstein and Nathan Rosen in 1935. Albert Einstein and Nathan Rosen suggested their idea as a way to get around the notion of black hole singularities.
Twesh Upadhyaya, William F. Braasch, Jr., Gabriel T. Landi, and Nicole Yunger Halpern PRX Quantum 5, 030355 – Published 23 September 2024 https://journals.aps.org/prxquantum/abstract/10.1103/PRXQuantum.5.
As an ice cube melts in water, the heat exchange d by the two produces disorder. Imagine measuring the heat flow while the ice melts in each of many trials. From the measurement results, one can compute the disorder generated in each trial—the stochastic entropy production (SEP). The SEP is well understood in the case of two classical systems interacting; there is one widely accepted SEP definition that can be expressed equivalently via three formulas. But the situation is far murkier for quantum analogues, such as two atoms exchanging components of spin.
Generalizing the three SEP formulas to accommodate quantum systems, we prove that quantum effects render the three SEP formulas inequivalent. Each formula reasonably quantifies entropy production and highlights a different aspect of the underlying physics. The inequivalence of the formulas stems from the inability to simultaneously measure the exchange d quantities of the quantum systems, i.e., the uncertainty principle. This quantumness leads to negative and even nonreal entropy production. Though unusual, these entropy values herald notable physical phenomena. A negative entropy production signals superposition in the thermal initial states of the quantum systems. An imaginary entropy production witnesses contextuality, a precise notion of nonclassicality.
