How Quantum Computers Are Different

[Mahiuddin Ahmed]

The building blocks of quantum computers are not bits and transistors. They are qubits and physical components so small they operate by the rules of quantum physics. Qubits sharing mixed states speeds up computation—this is how they perform multiple calculations at once—it is absolutely essential the qubit maintain coherence during the calculation. Otherwise, we are just using a simple, slow digital computer only performing one calculation at a time.
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