“Want to come to a quantum computing party?” I wasn’t expecting the question. My brain was hurting: I’d just finished an hour-long interview with Jarrod McClean, a Google quantum computing scientist, and I was mentally planning to write up my notes. His talk had caught my attention the day before: McClean spoke animatedly, bobbing a magnificent head of shoulder-length ringlets, as he pointed at equations and diagrams on a PowerPoint presentation.

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