PARTICLE MAN

摘要

QHow are quantum computers different from ordinary ones? Quantum computers operate at the smallest, most fundamental levels allowed by physics. On a regular computer, a single bit of information is represented by a whole bunch of electrons. In a quantum computer, you store bits of information on the most elementary particles. So a "qubit" might be represented by a single electron. Why is a smaller bit better? At the quantum-mechanical level, an electron can be here and there at the same time. And if you're here and there, you can do this and that simultaneously.