DRESDEN, Germany--How cool would it be not just to read about the craziness of quantum mechanics, but to see it--even better, do it--for yourself? Several years ago I asked virtuoso experimental physicist Paul Kwiat whether he could develop a simple demonstration anyone could do at home, and he and his undergraduate student Rachel Killmer came up with a "quantum eraser" . This week I got to see another big step toward the era of quantum homebrewers
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