Tractor Beams - No Longer SciFi

Rebel ships better watch out because, apparently, we’re closer to making tractor beams a reality than ever. Once relegated to the realm of fantasy in Star Wars and Star Trek, Phys.org is reporting that a team of aerospace engineers led by Professor Hanspeter Schaub is working on electron beams that use attractive or repulsive electrostatic force to remove space debris from orbit. Presumably, if the team finds success in creating these beams, we could prevent Kessler Syndrome from becoming a reality.

Kessler Syndrome is a phenomenon, laid out by NASA scientist Donald Kessler, where the space debris in Earth’s orbit becomes so significant that it hinders our ability to launch satellites, spacecraft, orbital stations, and anything else into orbit. It’s a major problem that could easily become the state of our orbit if measures aren’t taken to prevent it. Using so-called “space dump trucks” with tractor beams could be one way to lessen our debris problem.

The main problem with space debris is that it’s not so easy to clear out, as objects in space move rapidly and unpredictably, so you can’t just grab it like you would grab trash out of the ocean. Tractor beams would allow us to move debris and other objects out of the way without having to touch them directly. Another example of the usefulness of these beams would be moving old satellites out of the way to make room for new satellites.

Of course, there is still a lot of work today before these tractor beams can be applied in real-world scenarios. To test the technology, the team uses a vacuum chamber called the Electrostatic Charging Laboratory for Interactions between Plasma and Spacecraft. The vacuum chamber can simulate a space environment, and the team can place simulated debris made out of metal to experiment with the electrostatic tractors.  READ MORE...

Climate Tipping Point

With climate-enhanced droughts, heatwaves and fires ravaging three continents and the threat of a new surge in global warming, the world urgently needs to ramp-up solutions for slashing carbon pollution. But which solutions are most critical?

The organization Project Drawdown has detailed the potential, feasibility and cost of nearly a hundred climate solutions since it was set up in 2017.

Executive director Jonathan Foley, a leading climate scientist, spoke to AFP about how to assess and prioritize the actions needed to keep Earth liveable.

The following interview has been edited for length and flow:

Q: What are the three most important questions in assessing the usefulness and integrity of carbon-cutting solutions?

A: Is it available now and ready to deploy? Because we need to start bending the emissions curve immediately.

Is it cost-effective? Otherwise, it's not going to scale effectively.

Does it create co-benefits for people, especially in terms of health, jobs, equity, and justice? This will make it far more appealing.

Q: A lot of hope—and investment—is going into technological solutions such as filtering fossil fuel pollution or pulling CO2 out of the air. Comment?

A: While some very limited carbon removal will be needed by mid-century, the vast, vast majority of the work we need to do—more than 95 percent—is cutting emissions, and doing it now.

Of the five percent focused on carbon removal, I think it should be more than 90 percent nature-based removal, such as ecological restoration and regenerative agriculture. Machine-based removal is unlikely to work at any meaningful scale.

Q: We often hear that solutions are already available, all that's missing is political will. Is that it?  READ MORE...

Graphene-Based Quantum Circuits

Imagine having a building made of stacks of bricks connected by adaptable bridges. You pull a knob that modifies the bridges and the building changes functionality. Wouldn't it be great?

A team of researchers led by Prof. Aitor Mugarza, from the Catalan Institute of Nanoscience and Nanotechnology (ICN2) and ICREA, together with Prof. Diego Peña from the Center for Research in Biological Chemistry and Molecular Materials of the University of Santiago de Campostela (CiQUS-USC), Dr. Cesar Moreno, formerly a member of ICN2's team and currently a researcher at the University of Cantabria, and Dr. Aran Garcia-Lekue, from the Donostia International Physics Center (DIPC) and Ikerbasque Foundation, has done something analogous, but at the single-atom scale, with the aim of synthesizing new carbon-based materials with tunable properties.

As explained in a paper just published in the Journal of the American Chemical Society (JACS) and featured on the cover of the issue, this research is a significant breakthrough in the precise engineering of atomic-thin materials —called "2D materials" due to their reduced dimensionality. The proposed fabrication technique opens exciting new possibilities for materials science, and, in particular, for application in advanced electronics and future solutions for sustainable energy.

The authors of this study synthesized a new nanoporous graphene structure by connecting ultra-narrow graphene strips, known as "nanoribbons", by means of flexible "bridges" made of phenylene moieties (which are portions of larger molecules).

By modifying in a continuous way the architecture and angle of these bridges, the scientists can control the quantum connectivity between the nanoribbon channels and, ultimately, fine-tune the electronic properties of the graphene nanoarchitecture. The tunability could also be controlled by external stimuli, such as strain or electric fields, providing opportunities for different applications.

These ground-breaking findings, resulting from a collaboration between top-tier Spanish institutions (CiQUS, ICN2, University of Cantabria, DIPC) and the Technical University of Denmark (DTU), shows that the proposed molecular bridge strategy can have a great impact on the synthesis of new materials with tailored properties and is a powerful tool for the realization of quantum circuits.  READ MORE...

Quantum Memory Stores Information

Researchers at University of Oxford have recently created a quantum memory within a trapped-ion quantum network node. Their unique memory design, introduced in a paper in Physical Review Letters, has been found to be extremely robust, meaning that it could store information for long periods of time despite ongoing network activity.

"We are building a network of quantum computers, which use trapped ions to store and process quantum information," Peter Drmota, one of the researchers who carried out the study, told Phys.org. "To connect quantum processing devices, we use single photons emitted from a single atomic ion and utilize quantum entanglement between this ion and the photons."

Trapped ions, charged atomic particles that are confined in space using electromagnetic fields, are a commonly used platform for realizing quantum computations. Photons (i.e., the particles of light), on the other hand, are generally used to transmit quantum information between distant nodes. Drmota and his colleagues have been exploring the possibility of combining trapped ions with photons, to create more powerful quantum technologies.

"Until now, we have implemented a reliable way of interfacing strontium ions and photons, and used this to generate high-quality remote entanglement between two distant network nodes," Drmota said. "On the other hand, high-fidelity quantum logic and long-lasting memories have been developed for calcium ions. In this experiment, we combine these capabilities for the first time, and show that it is possible to create high-quality entanglement between a strontium ion and a photon and thereafter store this entanglement in a nearby calcium ion."

Integrating a quantum memory into a network node is a challenging task, as the criteria that need to be fulfilled for such a system to work are higher than those required for the creation of a standalone quantum processor. Most notably, the developed memory would need to be robust against concurrent network activity.   READ MORE...

Quantum Information Between Technologies

A niobium superconducting cavity. The holes lead to tunnels which intersect to trap light and atoms. Credit: Aishwarya Kumar

Researchers have discovered a way to "translate" quantum information between different kinds of quantum technologies, with significant implications for quantum computing, communication, and networking.

The research was published in the journal Nature on Wednesday. It represents a new way to convert quantum information from the format used by quantum computers to the format needed for quantum communication.

Photons—particles of light—are essential for quantum information technologies, but different technologies use them at different frequencies. For example, some of the most common quantum computing technology is based on superconducting qubits, such as those used by tech giants Google and IBM; these qubits store quantum information in photons that move at microwave frequencies.

But if you want to build a quantum network, or connect quantum computers, you can't send around microwave photons because their grip on their quantum information is too weak to survive the trip.

"A lot of the technologies that we use for classical communication—cell phones, Wi-Fi, GPS and things like that—all use microwave frequencies of light," said Aishwarya Kumar, a postdoc at the James Franck Institute at University of Chicago and lead author on the paper. "But you can't do that for quantum communication because the quantum information you need is in a single photon. And at microwave frequencies, that information will get buried in thermal noise."

The solution is to transfer the quantum information to a higher-frequency photon, called an optical photon, which is much more resilient against ambient noise. 

But the information can't be transferred directly from photon to photon; instead, we need intermediary matter. Some experiments design solid state devices for this purpose, but Kumar's experiment aimed for something more fundamental: atoms.  READ MORE...

Quantum Phononic Processor

Quantum computing systems have the potential to outperform classical computers on some tasks, helping to solve complex real-world problems in shorter times. Research teams worldwide have thus been trying to realize this quantum advantage over traditional computers, by creating and testing different quantum systems.

Researchers at Tsinghua University recently developed a new programmable quantum phononic processor with trapped ions. This processor, introduced in a paper in Nature Physics, could be easier to scale up in size than other previously proposed photonic quantum processors, which could ultimately enable better performances on complex problems.

"Originally, we were interested in the proposal of Scott Aaronson and others about Boson sampling, which might show the quantum advantages of simple linear optics and photons," Kihwan Kim, one of the researchers who carried out the study, told Phys.org. "We were wondering if it is possible to realize it with the phonons in a trapped ion system."

The use of phonons (i.e., sound waves or elementary vibrations) to create quantum computing systems was theoretically explored for some time. In recent years, however, physicists created trapped-ion systems created the technology necessary to use phonons as a quantum information processing resource, rather than mere mediators for entangling qubits.

"It has been shown that phonons at a harmonic potential can coherently transfer to the other harmonic potential and these phonons can interfere with each other," Kihwan Kim explained. "When we learned that a modified boson sampling (Gaussian boson sampling) can also be applied to a chemical problem (i.e., vibrational sampling) we demonstrated the sampling of SO2 molecules and developed a method to create a highly entangled phononic state; yet this was limited to a single ion. In this work, we finally implemented the phononic network in a scalable way, overcoming the limits of single ions."

The system created by Kihwan Kim and his colleagues is a programmable bosonic network, a network consisting of a set of bosonic modes, connected to each other via controllable beam splitters. They realized this network using phonons, excitations of collective vibrational modes that are also bosons.  READ MORE...

Prehistoric Hunting in Desert

Aerial photo of a typical kite from eastern Jordan. Credit: APAAME

Archaeologists at the University of Oxford's School of Archaeology have used satellite imagery to identify and map more than 350 monumental hunting structures known as "kites" across northern Saudi Arabia and southern Iraq—most of which had never been previously documented.

Led by Dr. Michael Fradley, a team of researchers in the Endangered Archaeology in the Middle East and North Africa (EAMENA) project used a range of open-source satellite imagery to carefully study the region around the eastern Nafud desert, an area little studied in the past. The surprising results, published in the journal The Holocene, have the potential to change our understanding of prehistoric connections and climate change across the Middle East.

Termed kites by early aircraft pilots, these structures consist of low stone walls making up a head enclosure and a number of guiding walls, sometimes kilometers long. They are believed to have been used to guide game such as gazelles into an area where they could be captured or killed. There is evidence that these structures may date back as far as 8,000 BCE in the Neolithic period.

Kites cannot be observed easily from the ground, however the advent of commercial satellite imagery and platforms such as Google Earth have enabled recent discoveries of new distributions. While these structures were already well-known from eastern Jordan and adjoining areas in southern Syria, these latest results take the known distribution over 400km further east across northern Saudi Arabia, with some also identified in southern Iraq for the first time.  READ MORE...

Two Biblical Heroines Uncovered

The Israelite commander Barak depicted in the Huqoq synagogue mosaic. Several BYU students 

were part of the team to help excavate at the ancient Jewish village site. Credit: Jim Haberman

As they brushed the last layer of dirt from a small section of mosaic on the synagogue floor, the archaeologists were momentarily baffled by the odd image beginning to emerge.

"Then we realized we were looking at the story of Jael pounding the stake through the head of Sisera the Canaanite," said BYU ancient scripture professor Matthew Grey. "We brought out a phone and pulled up Judges 4 to read the story while we uncovered the scene."

Almost every summer since 2011, BYU faculty and students have joined a consortium of universities led by the University of North Carolina at Chapel Hill to excavate the synagogue in the ancient Jewish village of Huqoq, on the northwest shore of the Sea of Galilee. This year's work on the building's beautiful mosaic floor, which dates from the late fourth—early fifth century C.E., yielded a unique discovery: fragments showing Jael and the prophetess Deborah.

"This is the first time we've seen a depiction of the biblical heroines Deborah and Jael in ancient Jewish art," said project director and UNC professor Jodi Magness.

Situated in the southwest corner of the building just to the left of the synagogue's entrance, the panels highlight how the women helped save Israel through their gifts and intrepidity. One patch shows Deborah sitting under her palm tree, giving instructions to the Israelite general Barak to guide her people in battle (Judges 4:4–10). 

Below that, another patch shows Jael driving a tent stake through Sisera's temple, taking out the Canaanite general to help Israel defeat their enemy (Judges 4:17–22).  READ MORE...

Understanding Color Perception

A new study corrects an important error in the 3D mathematical space developed by the Nobel Prize-winning physicist Erwin Schrödinger and others, and used by scientists and industry for more than 100 years to describe how your eye distinguishes one color from another. 

The research has the potential to boost scientific data visualizations, improve TVs and recalibrate the textile and paint industries.

"The assumed shape of color space requires a paradigm shift," said Roxana Bujack, a computer scientist with a background in mathematics who creates scientific visualizations at Los Alamos National Laboratory. 

Bujack is lead author of the paper by a Los Alamos team in the Proceedings of the National Academy of Sciences on the mathematics of color perception.

"Our research shows that the current mathematical model of how the eye perceives color differences is incorrect. That model was suggested by Bernhard Riemann and developed by Hermann von Helmholtz and Erwin Schrödinger—all giants in mathematics and physics—and proving one of them wrong is pretty much the dream of a scientist," said Bujack.

Modeling human color perception enables automation of image processing, computer graphics and visualization tasks.

"Our original idea was to develop algorithms to automatically improve color maps for data visualization, to make them easier to understand and interpret," Bujack said. 

So the team was surprised when they discovered they were the first to determine that the longstanding application of Riemannian geometry, which allows generalizing straight lines to curved surfaces, didn't work.  READ MORE...

Room Temperature Superconductivity

Less than two years after shocking the science world with the discovery of a material capable of room-temperature superconductivity, a team of UNLV physicists has upped the ante once again by reproducing the feat at the lowest pressure ever recorded.

In other words, science is closer than it's ever been to a usable, replicable material that could one day revolutionize how energy is transported. UNLV physicist Ashkan Salamat and colleague Ranga Dias, a physicist with the University of Rochester, made international headlines in 2020 by reporting room-temperature superconductivity for the first time. To achieve the feat, the scientists chemically synthesized a mix of carbon, sulfur, and hydrogen first into a metallic state, and then even further into a room-temperature superconducting state using extreme pressure—267 gigapascals—conditions you'd only find in nature near the center of the Earth. Fast forward less than two years, and the team is now able to complete the feat at just 91 GPa—roughly one-third the pressure initially reported. The new findings were published this month as an advance article in the journal Chemical Communications.

A super discovery
Through a detailed tuning of the composition of carbon, sulfur, and hydrogen used in the original breakthrough, scientists are able to produce a material at a lower pressure that retains its state of superconductivity.

"These are pressures at a level difficult to comprehend and evaluate outside of the lab, but our current trajectory shows that it's possible achieve relatively high superconducting temperatures at consistently lower pressures—which is our ultimate goal," said study lead author Gregory Alexander Smith, a graduate student researcher with UNLV's Nevada Extreme Conditions Laboratory (NEXCL). "At the end of the day, if we want to make devices beneficial to societal needs, then we have to reduce the pressure needed to create them."  READ MORE...

The Fuel of Evolution

Darwinian evolution is the process by which natural selection promotes genetic changes in traits that favor survival and reproduction of individuals. How fast evolution happens depends crucially on the abundance of its "fuel": how much genetic difference there is in the ability to survive and reproduce. 

New research by an international research team with participation of the Leibniz Institute for Zoo and Wildlife Research (Leibniz-IZW) has now discovered that the raw material for evolution is much more abundant in wild animals than previously believed. The findings were published in Science.

Darwin thought of the process of evolution as something slow, visible only over geological ages. However, researchers have since discovered many examples of evolution occurring in just a few years. 

One such example is that of British populations of the peppered moth, where the abundance of two color morphs changed dramatically in only a few decades, as the result of evolution by natural selection favoring different morphs depending on the level of air pollution. It was unclear however how fast animals with longer lifespans such as birds and mammals can evolve and adapt to environmental change.

Led by Dr. Timothée Bonnet from the Australian National University, a team of 40 researchers from 27 institutions addressed this question and measured how much of the "fuel of evolution" exists overall in wild populations of birds and mammals. 

The answer: many populations of birds and mammals can evolve surprisingly fast—their amount of genetic difference in the ability to survive and reproduce being two to four times higher than previously thought.  READ MORE...

Quantum Physics Phenomenon of Materials

Credit: Pixabay/CC0 Public Domain

Researchers at Northeastern have discovered a new quantum phenomenon in a specific class of materials, called antiferromagnetic insulators, that could yield new ways of powering "spintronic" and other technological devices of the future.


The discovery illuminates "how heat flows in a magnetic insulator, [and] how [researchers] can detect that heat flow," says Gregory Fiete, a physics professor at Northeastern and co-author of the research. The novel effects, published in Nature Physics this week and demonstrated experimentally, were observed by combining lanthanum ferrite (LaFeO3) with a layer of platinum or tungsten.

"That layered coupling is what is responsible for the phenomenon," says Arun Bansil, university distinguished professor in the Department of Physics at Northeastern, who also took part in the study.

The discovery may have numerous potential applications, such as improving heat sensors, waste-heat recycling, and other thermoelectric technologies, Bansil says. This phenomenon could even lead to development of a new power source for these—and other—budding technologies. Northeastern graduate student Matt Matzelle and Bernardo Barbiellini, a computational and theoretical physicist at the Lappeenranta University of Technology, who is currently visiting Northeastern, participated in the research.

Illustrating the teams' findings requires considerable magnification (literally) to observe the world of atomic-scale particles—specifically, at the nano-lives of electrons. It also requires an understanding of several properties of electrons—that they possess something called "spin," have a charge, and can, when moving through a material, generate heat flow.

Electron spin, or angular momentum, describes a fundamental property of electrons defined in one of two potential states: Up or down. There are many different ways these "up or down" spins of the electrons (also thought of as north-south poles) orient themselves in space, which in turn gives rise to different types of magnetisms. It all depends, Bansil says, on the ways atoms are patterned in a given material.  READ MORE...

Nubian Stone and Quantum Computers

Cuprous oxide – the mined crystal from Namibia used for making Rydberg polaritons. Credit: University of St Andrews

A special form of light made using an ancient Namibian gemstone could be the key to new light-based quantum computers, which could solve long-held scientific mysteries, according to new research led by the University of St Andrews.

The research, conducted in collaboration with scientists at Harvard University in the US, Macquarie University in Australia and Aarhus University in Denmark and published in Nature Materials, used a naturally mined cuprous oxide (Cu2O) gemstone from Namibia to produce Rydberg polaritons, the largest hybrid particles of light and matter ever created.

Rydberg polaritons switch continually from light to matter and back again. In Rydberg polaritons, light and matter are like two sides of a coin, and the matter side is what makes polaritons interact with each other.

This interaction is crucial because this is what allows the creation of quantum simulators, a special type of quantum computer, where information is stored in quantum bits. These quantum bits, unlike the binary bits in classical computers that can only be 0 or 1, can take any value between 0 and 1. They can therefore store much more information and perform several processes simultaneously.  READ MORE...

Medieval Manuscripts

'Le Régime du corps' described a variety of ways to maintain health by keeping the body in balance. The Bute Painter, circa 1285, MS Arsenal 2510. Credit: Bibliothèque nationale de France

What type of images come to mind when you think of medieval art? Knights and ladies? Biblical scenes? Cathedrals? It's probably not some unfortunate man in the throes of vomiting.

It might surprise you to learn this scene is found in a luxurious book from the Middle Ages made with the highest-quality materials, including abundant gold leaf. Known as an illustrated manuscript, it was made entirely by hand, as virtually all books were before the adoption of the printing press.

Why would such an opulent art form depict such a mundane topic?

Scholars believe that around 1256, a French countess commissioned the creation of a health manual to share with her four daughters just as they were forming their own households. Known as the "Régime du corps," or "regimen of the body," the book was widely copied and became extremely popular across Europe in the late Middle Ages, specifically between the 13th and 15th centuries. Over 70 unique manuscripts survive today. They offer a window into many aspects of everyday medieval life—from sleeping, bathing and preparing food to bloodletting, leeching and purging.

I'm an art historian who recently published a book called "Visualizing Household Health: Medieval Women, Art, and Knowledge in the Régime du corps" about these magnificent illustrated copies. What's fascinating to me about the "Régime du corps" is how it depicts the responsibilities of women in wealthy medieval households—and how domestic management advice was passed down among them.

In a chapter on caring for one's complexion, two women exchange a remedy. 'Le Régime du corps,' circa 1265-70. British Library, MS Sloane 2435. Credit: The British Library Board

Glimpsing relationships

The illustrations, which are usually located at the start of each chapter, convey information not often found in other historical records. Even if the images are idealized, they reveal an extraordinary amount about the clothes, objects and furnishings of the period. They also show interactions among people that reflect the culture and society in which these books were made.  READ MORE...

AVARS With Ancient DNA

Reconstruction of an Avar-period armoured horseman based on Grave 1341/1503 of the Derecske-Bikás-dűlő site (Déri Museum, Debrecen). Credit: © Ilona C. Kiss

Less known than Attila's Huns, the Avars were their more successful successors. They ruled much of Central and Eastern Europe for almost 250 years. We know that they came from Central Asia in the sixth century CE, but ancient authors as well as modern historians have long debated their provenance.


Now, a multidisciplinary research team of geneticists, archeologists and historians, including researchers from the Max Planck Institute for Evolutionary Anthropology in Leipzig, Germany, obtained and studied the first ancient genomes from the most important Avar elite sites discovered in contemporary Hungary. This study traces the genetic origin of the Avar elite to a faraway region of East Central Asia. It provides direct genetic evidence for one of the largest and most rapid long-distance migrations in ancient human history.

ila

In the 560s, the Avars established an empire that lasted more than 200 years, centered in the Carpathian Basin. Despite much scholarly debate their initial homeland and origin has remained unclear. They are primarily known from historical sources of their enemies, the Byzantines, who wondered about the origin of the fearsome Avar warriors after their sudden appearance in Europe. Had they come from the Rouran empire in the Mongolian steppe (which had just been destroyed by the Turks), or should one believe the Turks who strongly disputed such a legacy?

Historians have wondered whether that was a well-organized migrant group or a mixed band of fugitives. Archeological research has pointed to many parallels between the Carpathian Basin and Eurasian nomadic artifacts (weapons, vessels, horse harnesses), for instance a lunula-shaped pectoral of gold used as a symbol of power. We also know that the Avars introduced the stirrup in Europe. Yet we have so far not been able to trace their origin in the wide Eurasian steppes.  READ MORE...

Vikings Left Greenland in the 15th Century

One of the great mysteries of late medieval history is why did the Norse, who had established successful settlements in southern Greenland in 985, abandon them in the early 15th century? The consensus view has long been that colder temperatures, associated with the Little Ice Age, helped make the colonies unsustainable. 

However, new research, led by the University of Massachusetts Amherst and published recently in Science Advances, upends that old theory. It wasn't dropping temperatures that helped drive the Norse from Greenland, but drought.

When the Norse settled in Greenland on what they called the Eastern Settlement in 985, they thrived by clearing the land of shrubs and planting grass as pasture for their livestock. The population of the Eastern Settlement peaked at around 2,000 inhabitants, but collapsed fairly quickly about 400 years later. 

For decades, anthropologists, historians and scientists have thought the Eastern Settlement's demise was due to the onset of the Little Ice Age, a period of exceptionally cold weather, particularly in the North Atlantic, that made agricultural life in Greenland untenable.

However, as Raymond Bradley, University Distinguished Professor of geosciences at UMass Amherst and one of the paper's co- author, points out, "before this study, there was no data from the actual site of the Viking settlements. And that's a problem." 

Instead, the ice core data that previous studies had used to reconstruct historical temperatures in Greenland was taken from a location that was over 1,000 kilometers to the north and over 2,000 meters higher in elevation. "We wanted to study how climate had varied close to the Norse farms themselves," says Bradley. And when they did, the results were surprising.  READ MORE...

Interior of Protons Entangled

If a photon carries too little energy, it does not fit inside a proton (left). A photon with sufficiently high energy is so small that it flies into the interior of a proton, where it 'sees' part of the proton (right). Maximum entanglement then becomes visible between the 'seen' and 'unseen' areas. Credit: IFJ PAN



Fragments of the interior of a proton have been shown by scientists from Mexico and Poland to exhibit maximum quantum entanglement. The discovery, already confronted with experimental data, allows us to suppose that in some respects the physics of the inside of a proton may have much in common not only with well-known thermodynamic phenomena, but even with the physics of... black holes.

Various fragments of the inside of a proton must be maximally entangled with each other, otherwise theoretical predictions would not agree with the data collected in experiments, it was shown in European Physical Journal C. 

The theoretical model (which extends the original proposal by physicists Dimitri Kharzeev and Eugene Levin) makes it possible to suppose that, contrary to current belief, the physics operating inside protons may be related to such concepts as entropy or temperature, which in turn may relate it to such exotic objects as black holes. 

The authors of the discovery are Dr. Martin Hentschinski from the Universidad de las Americas Puebla in Mexico and Dr. Krzysztof Kutak from the Institute of Nuclear Physics of the Polish Academy of Sciences (IFJ PAN) in Cracow, Poland.

The Mexican-Polish theorists analyzed the situation in which electrons are fired at protons. When an incoming electron carrying a negative electric charge approaches a positively charged proton, it interacts with it electromagnetically and deflects its path. 

Electromagnetic interaction means that a photon has been exchanged between the electron and the proton. The stronger the interaction, the greater the change in momentum of the photon and therefore the shorter the associated electromagnetic wave.  READ MORE...

Hybrid Atomic Quantum Computers

Left: A hybrid array of cesium atoms (yellow) and rubidium atoms (blue). Right: The customizability of the researchers' technique enables them to place the atoms anywhere, allowing them to create this image of Chicago landmarks Willis Tower and the Cloud Gate. The scale bar in both images is 10 micrometers. Credit: Hannes Bernien

Qubits, the building blocks of quantum computers, can be made from many different technologies. One way to make a qubit is to trap a single neutral atom in place using a focused laser, a technique that won the Nobel Prize in 2018.


But to make a quantum computer out of neutral atom qubits, many individual atoms must be trapped in place by many laser beams. So far, these arrays have only been constructed from atoms of a single element, out of concern that making an array out of two elements would be prohibitively complex.

But for the first time, University of Chicago researchers have created a hybrid array of neutral atoms from two different elements, significantly broadening the system's potential applications in quantum technology. The results were funded in part by the NSF Quantum Leap Challenge Institute Hybrid Quantum Architectures and Networks (HQAN), and published in Physical Review X.

"There have been many examples of quantum technology that have taken a hybrid approach," said Hannes Bernien, lead researcher of the project and assistant professor in University of Chicago's Pritzker School of Molecular Engineering. "But they have not been developed yet for these neutral atom platforms. We are very excited to see that our results have triggered a very positive response from the community, and that new protocols using our hybrid techniques are being developed."

Double the potential
While manmade qubits such as superconducting circuits require quality control to stay perfectly consistent, neutral atoms made from a single element all have exactly the same properties, making them ideal, consistent candidates for qubits.

But since every atom in the array has the same properties, it's extremely difficult to measure a single atom without disturbing its neighbors—they're all on the same frequency, so to speak.  READ MORE...

JORO Spiders

A female Joro spider crawls across a branch. Credit: Davis et al, Physiological evaluation of newly invasive jorō spiders (Trichonephila clavata) in the southeastern USA compared to their naturalized cousin, Trichonephila clavipes, Physiological Entomology (2022).

If you live in Georgia, it's hard not to notice the state's latest resident.

The bright yellow, blue-black and red spiders' golden webs will be all over power lines, in trees around town and even on your front porch come summer.

The Joro spider first arrived stateside around 2013 and has since spread across the state and Southeast. But new research from the University of Georgia suggests the invasive arachnids could spread through most of the Eastern Seaboard of the U.S.

There's really nothing we can do to stop them. But that's not necessarily bad news.

Joros don't appear to have much of an effect on local food webs or ecosystems, said Andy Davis, corresponding author of the study and a research scientist in the Odum School of Ecology. They may even serve as an additional food source for native predators like birds.

"People should try to learn to live with them," he said. "If they're literally in your way, I can see taking a web down and moving them to the side, but they're just going to be back next year."

"The way I see it, there's no point in excess cruelty where it's not needed," added Benjamin Frick, co-author of the study and an undergraduate researcher in the School of Ecology. "You have people with saltwater guns shooting them out of the trees and things like that, and that's really just unnecessary."  READ MORE...

Innovative New Magnet

PPPL physicist Yuhu Zhai in front of a series of images related to his magnet research. 

Scientists at the U.S. Department of Energy's (DOE) Princeton Plasma Physics Laboratory (PPPL) have designed a new type of magnet that could aid devices ranging from doughnut-shaped fusion facilities known as tokamaks to medical machines that create detailed pictures of the human body.

Tokamaks rely on a central electromagnet known as a solenoid to create electrical currents and magnetic fields that confine the plasma—the hot, charged state of matter composed of free electrons and atomic nuclei—so fusion reactions can occur. But after being exposed over time to energetic subatomic particles known as neutrons emanating from the plasma, insulation surrounding the electromagnet's wires can degrade. If they do, the magnet could fail and reduce a tokamak's ability to harness fusion power.

In this new type of magnet, metal acts as insulation and therefore would not be damaged by particles. In addition, it would operate at higher temperatures than current superconducting electromagnets do, making it easier to maintain.

Fusion, the power that drives the sun and stars, combines light elements in the form of plasma to generates massive amounts of energy. Scientists are seeking to replicate fusion on Earth for a virtually inexhaustible supply of power to generate electricity.

"Our innovation both simplifies the fabrication process and makes the magnet more tolerant of the radiation produced by the fusion reactions," said Yuhu Zhai, a principal engineer at PPPL and lead author of a paper reporting the results in Superconductor Science and Technology.  READ MORE...