![]() The new protocol is designed for quantum devices where the basic building blocks-qubits-influence each other even when they aren't right next to each other. ![]() Unsurprisingly, the theoretical speed limit for sending information in a quantum device (such as a quantum computer) depends on the device's underlying structure. And we were trying a lot to improve the bound-turns out that wasn't possible. "We actually weren't expecting this proposal to be this powerful. "This gap between maximum speeds and achievable speeds had been bugging us, because we didn't know whether it was the bound that was loose, or if we weren't smart enough to improve the protocol," says Minh Tran, a JQI and QuICS graduate student who was the lead author on the article. Gorshkov, who is also a Fellow of the Joint Center for Quantum Information and Computer Science (QuICS) and a physicist at the National Institute of Standards and Technology, and his colleagues presented their new protocol in a recent article published in the journal Physical Review X. Their result provides new insight into designing optimal quantum algorithms and proves that there hasn't been a lower, undiscovered limit thwarting attempts to make better designs. Now a team of researchers, led by JQI Fellow Alexey Gorshkov, have found a quantum protocol that reaches the theoretical speed limits for certain quantum tasks. In this way, information speed limits are more like the max score on an old school arcade game than traffic laws, and achieving the ultimate score is an alluring prize for scientists. The underlying rules define the best performance that is possible. For any quantum task, there is a limit to how quickly interactions can make their influence felt (and thus transfer information) a certain distance away. It's as though no car manufacturer could figure out how to make a model that reached the local highway limit.īut unlike speed limits on roadways, information speed limits can't be ignored when you're in a hurry-they are the inevitable results of the fundamental laws of physics. For certain tasks, there was a gap between the best speeds allowed by theory and the speeds possible with the best algorithms anyone had designed. These speed limits are called Lieb-Robinson bounds, and, for several years, some of the bounds have taunted researchers.
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