Physicists have made the first step towards building quantum computers out of individual molecules trapped with laser devices called optical tweezers. Two teams report their results in Science on 7 December1,2, in both cases making pairs of calcium monofluoride molecules interact so that they became entangled — a crucial effect for quantum computing.

The two papers constitute a “landmark result”, says Adam Kaufman, a physicist at the University of Colorado Boulder. “This opens the door to leveraging entangled states to enhance the potential applications of molecular tweezer arrays.”

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