Somewhere between 1980 and 1996, physics and computer science got together and had a baby called quantum computing. The point? That if you built a computer out of bits that obey quantum physics (“qubits”), it would change the ground rules of computing — i.e., logic. Quantum logic is different from classical logic, and — as it turns out — both powerful and useful. A quantum computer would be blazingly fast for certain problems. However… some big obstacles stand in the way. The biggest, baddest, bogeyman of quantum computing is NOISE — also called errors, faults, or decoherence. Amazingly, we are winning the war on noise. Prospects for achieving useful quantum computing look good. I will take you on a whirlwind tour of (1) how you describe noise in quantum hardware, (2) how you fight it, and (3) how you probe (debug) it.
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