Finnish researchers demonstrate how noise impacts quantum computing

A team of researchers from three Finnish institutions (CSC, Aalto University, and Abo Akademi University) and their collaborators from Boston University in the USA have for the first time demonstrated how the noise impacts a calculation in a systematic way. By varying the time over which the quantum property of the qubits is changed (from microseconds to milliseconds) and studying different numbers of coupled qubits in a D-Wave device, they were able to confirm a general principle of defect creation (meaning errors in the calculation). "According to this principle, a longer computing time should give a better result, but the researchers found that the noise negatively affects the results more if the time is longer. They explained this behavior by a mathematical model, which will be a useful tool for diagnosing future quantum annealing devices and to find the best ways to operate them."

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