Science, Space and Technology News 2024
Researchers at Caltech have developed a novel method for measuring the error rates of quantum computers using classical computers, without the need for full simulations. This breakthrough helps overcome the challenges posed by the inherent errors in quantum systems and could accelerate the development of more accurate quantum computing technologies. Credit: SciTechDaily.
One key feature of the simulator, and of all quantum computers, is entanglement—a phenomenon in which certain atoms become connected to each other without actually touching. When quantum computers work on a problem, entanglement is naturally built up in the system, invisibly connecting the atoms.
But once the machines reach a certain number of connected atoms, or qubits, they can no longer be simulated using classical computers. “When you get past 30 qubits, things get crazy,” Shaw says. “The more qubits and entanglement you have, the more complex the calculations are.” “Instead, we have many classical computers paint the same thing with progressively finer and finer brushes, and then we squint our eyes and estimate what it would have looked like if they were perfect. Then we use that to compare against the quantum computer and estimate its errors. With many cross-checks, we were able to show this ‘squinting’ is mathematically sound and gives the answer quite accurately.
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