7/31/2023 0 Comments Big quantum error after all![]() “Their demonstration is 99% noise and only 1% signal,” Kuperberg says.Įxperimenters have already made a start. But the pattern was barely distinguishable from the random flipping of qubits caused by noise. So by measuring it, the quantum computer did something that no ordinary computer could match. Given the complexity of the interactions, a supercomputer would need thousands of years to calculate the pattern of outputs, the researchers said. They implemented a set of randomly chosen interactions among the qubits that in repeated trials made some outputs more likely than others. Researchers began by setting the 53 qubits to encode all possible outputs, which ranged from zero to 253. ![]() Noise nearly drowned out the signal in Google’s quantum supremacy experiment. Jay Gambetta, who leads IBM’s quantum computing efforts, says, “In the next couple of years, you’ll see a series of results that will come out from us to deal with error correction.” “That’s very explicitly the next big milestone,” says Hartmut Neven, who leads Google’s Quantum Artificial Intelligence lab. The early leaders in quantum computing-Google, Rigetti, and IBM-have all trained their sights on that target. “You’re trying to build a ship that remains the same ship, even as every plank in it rots and has to be replaced,” explains Scott Aaronson, a computer scientist at the University of Texas, Austin. All experts agree that spreading the information ordinarily encoded in a single jittery qubit among many of them in a way that maintains the information even as noise rattles the underlying qubits is critical. “It is really the difference between a $100 million, 10,000-qubit quantum computer being a random noise generator or the most powerful computer in the world,” says Chad Rigetti, a physicist and co-founder of Rigetti Computing. ![]() (Science.mag) Experts stress the importance of quantum error correction and author Adrian Cho has written an extensive review of the issue and attempts to correct quantum error correction. ![]()
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