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tiny transistor

SMALL WONDER  A new transistor, made with carbon nanotubes, is tinier than standard silicon versions. Four itty-bitty transistors sit between barriers (blue). Current flows through electrodes (red). Gates (yellow) turn current on and off

qubit representation

INDECISIVE INFO  A qubit can exist as both a 0 and 1. When the qubit is represented on a sphere, the angles formed by the radius determine the odds of measuring a 0 or 1.

IBM quantum computer

SEEKING QUANTUM SUPREMACY  Google, IBM and others are developing quantum computers. IBM has made its five-qubit computer accessible online for free, and the company is planning a 50-qubit computer for commercial use. The large tank shown here holds the cooling system that keeps a 17-qubit processor cold.

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