No one likes noise when they’re working through a difficult problem. Quantum computers are no different, and now researchers have devised a new way to estimate how noise can throw their calculations off, a big step towards making the technology practical. The quantum states at the heart of today’s quantum computers are fragile things. They are highly susceptible to disturbances from everything from stray magnetic fields to the minuscule imperfections in the control electronics or materials used to build the device.
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