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China To Connect Its High-Speed Rail To Europe
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Bethesda Unveils New Co-op Dungeon Crawler
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Pirate Bay Legal Action Dropped In Norway
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Microsoft shows off Windows Phone 7 Series dev tools at MIX10
The big theme at Microsoft's MIX10 developer conference today was developing for Windows Phone 7 Series, and key to this was the new Silverlight 4. For the first time, Microsoft showed off third-party applications for the forthcoming phone platform, and talked about how third-party applications integrate with the platform.
Silverlight is becoming increasingly widely available for the browser, with Microsoft claiming 60 percent of all Internet devices now support it (up from 45 percent in October last year). The new version, available as a Release Candidate today with a final version next month, boasts new features to make it more useful for developing both in-browser and standalone applications, including support for microphones and webcams, printing, and the clipboard.
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25 Years of the<nobr> <wbr></nobr>.com gTLD
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Attack of the Killer Electrons
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10 Kids and Teens on TV That We Don't Hate
Controlling multiple qubits with hyper-entanglement
Scientists are quickly putting the single-qubit system out of fashion with new setups that can simultaneously manipulate and read multiple qubits. An international collaboration recently completed an experiment involving the control of up to ten qubits at once, using hyper-entanglement and simple "cat states." While the system doesn't always read out perfectly, the approach could be further refined to produce better results.
Because qubit behavior is based in probability, it is difficult to exert a lot of control over a qubit. This problem gets a bit more significant as each additional qubit is added to the system, which has limited the number we can entangle at once. To hold down uncertainty and increase control as they add more qubits, scientists are now experimenting with hyper-entanglement, or entangling qubits on multiple levels at once. To put that another way, instead of entangling 10 different quantum objects, the authors entangled two separate properties of five items.
In this new experiment, scientists hyper-entangled sets of six, eight, and ten qubits in "cat states," or an equal superposition of two states (named after Schrodinger's cat, which occupied a superposition of the states "dead" or "alive"). The photons were entangled in two degrees of freedom: their polarization and their spatial modes. To get output from the photons once they were entangled, scientists used a special kind of interferometer that could gather information about one of the degrees of freedom without disturbing the other.
When the photons were measured, the photons produced the desired state around 60 percent of the time, with anything greater than 50% considered to be good enough to indicate that the system works at all. The eight-qubit system gave the best results, at 77.6 percent. The greatest limit of the system, according to the authors, was the photon detection efficiency, which will need to be significantly improved before implementation would be practical.
(Incidentally, the references to cat states start in the title—"Experimental demonstration of a hyper-entangled ten-qubit Schrödinger cat state"—and continue from there, with references to "ideal cat states" and "the hyper-entangled 2n-qubit cat state." "Cat" even appears as a term in some equations.
Nature Physics, 2010. DOI: 10.1038/NPHYS1603 (About DOIs).
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Nokia Claims Apple Does "Legal Alchemy" To Mask IP Theft
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