Explainer: What is a quantum computer?

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This is the first in a series of explainers on quantum technology. How it works, why it’s so powerful, and where it’s likely to be most useful first. By Martin Giles.

A quantum computer harnesses some of the almost-mystical phenomena of quantum mechanics to deliver huge leaps forward in processing power. Quantum machines promise to outstrip even the most capable of today’s – and tomorrow’s – supercomputers.

The secret to a quantum computer’s power lies in its ability to generate and manipulate quantum bits, or qubits. The article explains:

  • What is a qubit?
  • What is superposition?
  • What is entanglement?
  • What is decoherence?
  • What is quantum supremacy?
  • Where is a quantum computer likely to be most useful first?

The machines are also great for optimization problems because they can crunch through vast numbers of potential solutions extremely fast. Great read!

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