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Quantum Entanglement Could Stretch Across Time

Quantum Entanglement Could Stretch Across Time
In the weird world of quantum physics, two linked particles can share a single fate, even when they’re miles apart. Now, two physicists have mathematically described how this spooky effect, called entanglement, could also bind particles across time. If their proposal can be tested, it could help process information in quantum computers and test physicists’ basic understanding of the universe. “You can send your quantum state into the future without traversing the middle time,” said quantum physicist S. Jay Olson of Australia’s University of Queensland, lead author of the new study. In ordinary entanglement, two particles (usually electrons or photons) are so intimately bound that they share one quantum state — spin, momentum and a host of other variables — between them. Physicists have figured out how to use entanglement to encrypt messages in uncrackable codes and build ultrafast computers. Olson explained them with a Star Trek analogy. “It stimulated our imaginations,” said Fuentes. Related:  Quantum Entanglement

A Step Towards Quantum Computing: Entangling 10 Billion Particles | 80beats In life, most people try to avoid entanglement, be it with unsavory characters or alarmingly large balls of twine. In the quantum world, entanglement is a necessary step for the super-fast quantum computers of the future. According to a study published by Nature today, physicists have successfully entangled 10 billion quantum bits, otherwise known qubits. But the most significant part of the research is where the entanglement happened–in silicon–because, given that most of modern-day computing is forged in the smithy of silicon technology, this means that researchers may have an easier time incorporating quantum computers into our current gadgets. Quantum entanglement occurs when the quantum state of one particle is linked to the quantum state of another particle, so that you can’t measure one particle without also influencing the other. Spinning particles are all well and nice, but what do they have to do with computing? Image: Stephanie Simmons

Multiple Asteroid Strikes May Have Killed Mars’s Magnetic Field | Wired Science Once upon a time, Mars had a magnetic field, just like Earth. Four billion years ago, it vanished, taking with it the planet’s chances of evolving life as we know it. Now scientists have proposed a new explanation for its disappearance. A model of asteroids striking the red planet suggests that, while no single impact would have short-circuited the dynamo that powered its magnetism, a quick succession of 20 asteroid strikes could have done the job. “Each one crippled a little bit,” said geophysicist Jafar Arkani-Hamed of the University of Toronto, author of the new study. “We believe those were enough to cripple, cripple, cripple, cripple until it killed all of the dynamo forever.” Rocky planets like Earth, Mars, Mercury and even the moon get their magnetic fields from the movement of molten iron inside their cores, a process called convection. But Arkani-Hamed’s new study in the Journal of Geophysical Research suggests that just one impact wouldn’t suffice. Image: NASA See Also:

10/23/13, 19:15-- This actually coincides with Quantum networks advance with entanglement of photons, solid-state qubits A team of Harvard physicists led by Mikhail D. Lukin has achieved the first-ever quantum entanglement of photons and solid-state materials. The work marks a key advance toward practical quantum networks, as the first experimental demonstration of a means by which solid-state quantum bits, or "qubits," can communicate with one another over long distances. Quantum networking applications such as long-distance communication and distributed computing would require the nodes that process and store quantum data in qubits to be connected to one another by entanglement, a state where two different atoms become indelibly linked such that one inherits the properties of the other. "In quantum computing and quantum communication, a big question has been whether or how it would be possible to actually connect qubits, separated by long distances, to one another," says Lukin, professor of physics at Harvard and co-author of a paper describing the work in the journal Nature.

Op-Ed: The Mass Extinction of Scientists Who Study Species | Wired Science We are currently in a biodiversity crisis. A quarter of all mammals face extinction, and 90 percent of the largest ocean fish are gone. Species are going extinct at rates equaled only five times in the history of life. Scientists who classify, describe and examine the relationships between organisms are themselves going extinct. Take for example the aplacophorans, a rare rare group of invertebrates closely related to octopuses, squids, snails and clams. Fewer than two dozen scientific papers have been published on the group since 2005, even though many new species await discovery and description. If 50 percent of the species of aplacophoran went extinct tomorrow, we would never know. Amelie’s story is tragically common. Both kinorhynchs and gnathostomulids are small, less than one-tenth of an inch in length, and dwell in between grains of sand and mud on the ocean floor. Aplacophorans This problem plagues well-known groups, too. Why the loss of taxonomists? Why?

10/23/13, 19:19-- This essentially would be Quantum Entanglement Whatever happened to one particle would thus immediately affect the other particle, wherever in the universe it may be. Einstein called this "Spooky action at a distance." Amir D. Aczel, Entanglement, The Greatest Mystery In Physics. The Theory When a photon (usually polarized laser light) passes through matter, it will be absorbed by an electron. When the original photon splits into two photons, the resulting photon pair is considered entangled. The process of using certain crystals to split incoming photons into pairs of photons is called parametric down-conversion. Normally the photons exit the crystal such that one is aligned in a horizontally polarized light cone, the other aligned vertically. To illustrate, if an entangled photon meets a vertical polarizing filter (analagous to the fence in Figure 4.4), the photon may or may not pass through. The Practice Experiments have shown that Einstein may have been wrong: entangled photons seem to communicate instantaneously. Figure 5.1.

New Doubts Raised About Potential Bee-Killing Pesticide | Wired Science A federal entomologist has become the latest researcher to voice doubts about neonicotinoids, a controversial new type of pesticide that may be linked to the collapse of honeybee populations in the United States. The Independent reports that in a documentary screened in Europe but not yet broadcast stateside, USDA bee specialist Jeffrey Pettis describes exposing two groups of bees, one dosed with a neonicotinoid called imidacloprid, to Nosema, a common honeybee disease. Pesticide-dosed bees proved especially vulnerable to infection. Imidacloprid is manufactured by German agrochemical Bayer, who also manufacture clothianidin, another neonicotinoid. Since its approval, clothianidin has become widespread. Correlation isn’t cause, but there are already grounds for concern about clothianidin. “Clothianidin’s major risk concern is to non-target insects (that is, honey bees),” wrote those researchers. Image: Flickr, Jack Wolf See Also:

10/23/13, 16:19-- This may solve Einstein's Quantum Mechanics: Uncertainty Principle Used To Detect Entanglement Of Photon Shared Among Four Locations Scientists at the California Institute of Technology (Caltech) have developed an efficient method to detect entanglement shared among multiple parts of an optical system. They show how entanglement, in the form of beams of light simultaneously propagating along four distinct paths, can be detected with a surprisingly small number of measurements. Entanglement is an essential resource in quantum information science, which is the study of advanced computation and communication based on the laws of quantum mechanics. In the May 8 issue of the journal Science, H. Jeff Kimble, the William L. Valentine Professor and professor of physics at Caltech, and his colleagues demonstrate for the first time that quantum uncertainty relations can be used to identify entangled states of light that are only available in the realm of quantum mechanics. To enable future applications of multipartite W states, the entanglement contained in them must be detected and characterized.

Sleeping Protects Memories From Corruption | Wired Science “You must remember this,” Sam the piano player crooned to Humphrey Bogart and Ingrid Bergman in Casablanca. The couple might have recalled even more about their days in Paris if they’d been napping when Sam played the tune again. Replaying memories while people are awake leaves their memories subject to tinkering. But reactivating memories during sleep protects them from interference, researchers in Germany and Switzerland report online January 23 in Nature Neuroscience. The finding shows that the brain handles memories differently during sleep than while awake, says Sara Mednick, a cognitive neuroscientist at the University of California, San Diego who was not involved in the research. In the new study, volunteers played a Concentration-type game in which they had to remember the locations of pairs of cards. Both sleeping and awake volunteers who didn’t have their memories jogged by the odor remembered about 60 percent of the pairs. Image: Flickr/mollyollyoxenfree See Also: