Subscribe to Science 26 September 2013 3:05 pm , Vol. 341 , #6153 Sequester Takes Uneven Bite From Agency Budgets For nearly a year, research leaders have been warning that the 5% budget cut known as the sequester would have dire... U.S. Carbon Plan Relies on Uncertain Capture Technology A new proposal from the U.S. Environmental Protection Agency would place tighter limits on carbon dioxide emissions... Government's Start Leaves Scientists Uneasy Scientific leaders in Australia are quietly pleading their case to their new government, hoping to dissuade it from... DNA Sleuths Track C. difficile Infection Routes Patients hit with C. difficile often have violent diarrhea, which spreads the bug easily in unsanitary conditions... Zombie Endocrine Disruptors May Threaten Aquatic Life Many U.S. ranchers implant cattle with the synthetic androgen trenbolone acetate to beef them up, but concerns have... Special News Package: Taming a Mercurial Element Mercury has beguiled people for centuries, but the heavy metal also poses serious health and environmental dangers... With Pact's Completion, the Real Work Begins More than 140 nations will meet next month in Japan to formally adopt the Minamata Convention on Mercury. It calls for... In Minamata, Mercury Still Divides The new global agreement to reduce mercury emissions is named after Minamata, a small seaside town in southern Japan... More From this Issue
ScienceNowScienceInsiderScienceLiveAboutCurrently, all quantum computers involve only a few qubits "and thus can be easily verified by a classical computer, or on a piece of large numbers of qubits or two entangled quantum computers. But these still lie particular quantum computer and the computation it carries out. Still, the more traps users build into the tasks, the better they can ensure the quantum computer they test is computing accurately. "The test is designed in such a way that the quantum computer cannot distinguish the trap from its normal tasks," Walther says.
The researchers used a 4-qubit quantum computer as the verifier, but any size will do, and the more qubits the better, Walther notes. The technique is scalable, so it could be used even on computers with hundreds of qubits, he says, and it can be applied to any of the many existing quantum computing platforms.
"Like almost all current quantum computing experiments, this currently has the status of a fun demonstration proof of concept, rather than anything that's directly useful yet," says theoretical computer scientist Scott Aaronson at the Massachusetts Institute of Technology in Cambridge. But that doesn’t detract from the importance of these demonstrations, he adds. "I'm very happy that they're done, as they're necessary first steps if we're ever going to have useful quantum computers."
Posted In: Physics Related Stories
Government's Start Leaves Scientists Uneasy Australia's new government eliminated the science minister post and has begun dismantling climate change programs—and more tremors could follow.
Zombie Endocrine Disruptors May Threaten Aquatic Life Suggesting a new ecological threat, hormonal metabolites thought to degrade in sunlight can revert at night, zombielike, back into the endocrine-disrupting substances.
Special News Package: Taming a Mercurial Element Can a landmark global agreement to curb mercury pollution make a difference?
DNA Sleuths Track C. difficile Infection Routes C. difficile, a nasty hospital-acquired infection, is on the rise. Genetic sleuths are looking for where it is coming from and what can be done.
Sequester Takes Uneven Bite From Agency Budgets As the 2013 fiscal year comes to a close in the United States, the impact on science of the 5% federal budget cut known as the sequester is becoming clearer—sort of.
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