Perhaps Ada Lovelace, publishing the first computer algorithms in 1843. She wrote them for Babbage's Analytical Engine, which was never built. But I have no id

Perhaps Ada Lovelace, publishing the first computer algorithms in 1843. She wrote them for Babbage's Analytical Engine, which was never built. But I have no idea whether her work was used on the first functioning computers, rather than being just an example of what was possible. Maybe the QC situation is unique.