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Error Control Begins to Shape Quantum Architectures

By Chris Edwards
Communications of the ACM, January 2023, Vol. 66 No. 1, Pages 13-15
10.1145/3570518
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sound waves on both sides of a quantum computer, illustration

Quantum computing has a crucial weakness that may severely delay, if not kill outright, its chances of becoming a way of running algorithms that classical computers cannot handle: its susceptibility to noise.

Conventional electronic circuits face their own problems of how to deal with random changes to values in memory or circuits caused by cosmic rays and other interference. Codes that exploit just a few redundant data bits allow those random errors to be corrected on the fly.

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