Best of Last Week—New violations of local realism, a computer that runs on water droplets and nuts warding off diseases

June 15, 2015 by Bob Yirka, Phys.org report

By extending Gisin’s theorem from pure states to mixed states that obey a certain property, the results of the new paper could have applications for quantum certificate authorization protocols, like the one shown here. Credit: Chen, et al. ©2015 Nature Scientific Reports
(Phys.org)—It was an interesting week for physics as a combined team of researchers from China and Singapore demonstrated new violations of local realism—they have shown that all mixed entangled states that conform to a particular steering property will violate local realism. Also a team with the Federal University of Minas Gerais in Brazil showed that the Quantum Cheshire Cat effect may be explained by standard quantum mechanics, which questions the possibility of a particle being separated from its properties. And Joseph Fitzsimons and Carlos Pérez-Delgado published a paper describing a blind quantum computing method that surpasses the efficiency 'limit'—overcoming what has been considered to be a natural and universal limit on the efficiency of a particular quantum cryptography task.

Also, a team at MIT found that at near absolute zero temperatures, molecules may start to exhibit exotic states of matter—they chilled molecules in a gas of sodium potassium to a temperature of just 500 nanokelvins, which is over a million times colder than outer space, and found the molecules were more stable, lived longer and were more resistant to reactive collisions.

In other news, a team of engineers at Stanford developed a computer that operates on water droplets—it is a synchronous machine that operates using the unique physics involved with moving water droplets. And another team with the University of California demonstrated a way of counting people with WiFi—when those people are not even carrying WiFi enabled devices. Also, a team working at Case Western Reserve and UT Southwestern Medical Center announced a new drug that triggers tissue regeneration—called "SW033291," it promotes faster regrowth and healing of damaged tissues. And in an international effort, a team of researchers has shown that injectable electronics hold promise for basic neuroscience and treatment of neuro-degenerative diseases—they have developed a method for creating nano-sized scaffolds that can be injected using a simple syringe. And a team of researchers has banded together to develop a state-by-state plan for converting the US to 100 percent clean, renewable energy by 2050.

And finally, if you are one of those people that likes gobbling hard-walled, edible kernel fruit while watching football, good news: A team of researchers has found that nuts and peanuts may protect against major causes of death. Conducted by the Netherlands Cohort Study, the research revealed a lowered risk of not only cardiovascular disease but also neurodegenerative and respiratory diseases, diabetes and cancer.

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