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Category: computing – Page 210

In a new study, scientists from the US and Taiwan have theoretically demonstrated the existence of a universal lower bound on topological entanglement entropy, which is always non-negative. The findings are published in the journal Physical Review Letters.

Quantum systems are bizarre and follow their own rules, with quantum states telling us everything we know about that system. Topological entanglement entropy (TEE) is a measure that provides insights into emergent non-local phenomena and entanglement in with topological properties.

Given the fundamental role of quantum entanglement in and various information applications, understanding TEE becomes essential for gaining insights into the behavior of quantum systems.

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A quantum computing platform that is capable of the simultaneous operation of multiple spin-based quantum bits (qubits) has been created by researchers in South Korea. Designed by Yujeong Bae, Soo-hyon Phark, Andreas Heinrich and colleagues at the Institute for Basic Science in Seoul, the system is assembled atom-by-atom using a scanning tunnelling microscope (STM).

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While quantum computers of the future should be able to outperform conventional computers at certain tasks, today’s nascent quantum processors are still too small and noisy to do practical calculations. Much more must be done to create viable qubit platforms that can retain information for long enough for quantum computers to be viable.

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Quantum computers of the future hold promise in solving all sorts of problems. For example, they could lead to more sustainable materials and new medicines, and even crack the hardest problems in fundamental physics. But compared to the classical computers in use today, rudimentary quantum computers are more prone to errors. Wouldn’t it be nice if researchers could just take out a special quantum eraser and get rid of the mistakes?

Reporting in the journal Nature, a group of researchers led by Caltech is among the first to demonstrate a type of quantum eraser. The physicists show that they can pinpoint and correct for mistakes in quantum computing systems known as “erasure” errors.

“It’s normally very hard to detect errors in quantum computers, because just the act of looking for errors causes more to occur,” says Adam Shaw, co-lead author of the new study and a graduate student in the laboratory of Manuel Endres, a professor of physics at Caltech. “But we show that with some careful control, we can precisely locate and erase certain errors without consequence, which is where the name erasure comes from.”

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The US has relied on computer simulations since 1992 for verifying the performance of its nuclear stockpile but will soon get more realistic estimates.

Three US national defense labs are engaged in the process of building a test site, one thousand feet under the ground in Albuquerque, New Mexico, that will send powerful X-rays and verify the reliability of the country’s nuclear stockpile, a press release said.

The US nuclear program heavily relied on actual testing of warheads to determine if its stockpile could serve as a deterrent when called upon. This, however, changed in 1992, after then-President George H.W. Bush signed a law calling for a moratorium on nuclear testing.

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It could improve limits on information transfer speed but is made of a super expensive ingredient that might make it financially infeasible.

Researchers at Columbia University in the US have developed the fastest and most efficient superconductor that works at room temperature, a press release said. The superconductor is made of superatomic material only known by its chemical formula, Re6Se8Cl2.

In a short span of time, silicon has become an integral part of most modern-day equipment ranging from cell phones to cars, computers to smart homes. However, scientists have found that silicon will soon reach its limits. This is because of the atomic structure of the semiconductor.

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“For those who have lost their ability to communicate due to a variety of neurological conditions, there’s a lot of hope to preserve or regain their ability to communicate with family and friends.”

The term “brain-computer interface” (BCI) refers to a technology that creates a direct line of communication between the human brain and an outside object or computer system, opening up a wide range of possibilities for things like device control and neurological study.

Oonal/iStock.

Cortical Communication (CortiCom)

Continue reading “ALS patients control home devices with their minds using BCI” | >

A new study published in Nature Communications delves into the manipulation of atomic-scale spin transitions using an external voltage, shedding light on the practical implementation of spin control at the nanoscale for quantum computing applications.

Spin transitions at the atomic scale involve changes in the orientation of an atom’s intrinsic angular momentum or spin. In the atomic context, spin transitions are typically associated with electron behavior.

In this study, the researchers focused on using electric fields to control the spin transitions. The foundation of their research was serendipitous and driven by curiosity.

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The trial has revealed that Google was concerned about losing its monopoly to Spotlight, an in-house search engine made by Apple.

Google and Apple compete on several fronts – operating systems, email, app stores, cloud computing, and photo apps. While Google leads in the market share of its phone operating system, Apple boasts of a line of very cool hardware tech. But they remain partners in one key area, which is also currently in the eye of the storm.

Google pays Apple for its search engine to be the default selection on iPhones. Its parent company, Alphabet, pays the iPhone maker upwards of $20 billion annually as part of the deal. In 2016, Apple reportedly was presented with a lucrative billion-dollar offer by Microsoft to replace Google with Bing in its phones. But Apple didn’t budge.

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Still, experts caution that Chinese firms remain years behind in producing the lithography systems needed to make real progress.

China’s top memory chip maker, Yangtze Memory Technologies Corp (YMTC), has achieved a “surprise” breakthrough in producing the “world’s most advanced” 3D NAND memory chip, which is used in consumer devices like laptops and smartphones, a report by TechInsights.

Breaking the US sanctions barrier

The report (via SCMP), published on Wednesday, said that YMTC’s memory chip was found in a solid-state drive (ZhiTai Ti600 1TB) launched in July without much fanfare. The chip shows that YMTC has not given up on developing cutting-edge technology despite facing US sanctions that have restricted its access to essential equipment and components.

Continue reading “How China’s YMTC defied US sanctions with a chip breakthrough” | >

Researchers have developed a new computer simulation of the early universe that closely aligns with observations made by the James Webb Space Telescope (JWST).

Initial JWST observations hinted that something may be amiss in our understanding of early galaxy formation. The first galaxies studied by JWST appeared to be brighter and more massive than theoretical expectations.

The findings, published in The Open Journal of Astrophysics, by researchers at Maynooth University, Ireland, with collaborators from US-based Georgia Institute of Technology, show that observations made by JWST do not contradict theoretical expectations. The so-called “Renaissance simulations” used by the team are a series of highly sophisticated computer simulations of galaxy formation in the early universe.

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