How do you build a quantum computer?

 Particles can also be “entangled” with each other, as their quantum states become inextricably linked. Superposition and entanglement allow quantum computers to “solve some kinds of problems exponentially faster than classical computers,” Chiaverini says.

Chiaverini points to particular applications where quantum computers can shine. For example, they’re great at factoring large numbers, a vital tool in cryptography and digital security. They could also simulate complex molecular systems, which could aid drug discovery. In principle, quantum computers could turbocharge many areas of research and industry — if only we could build reliable ones.

Quantum systems are not easy to manage, thanks to two related challenges. The first is that a qubit’s superposition state is highly sensitive. Minor environmental disturbances or material defects can cause computer science vs computer engineering to err and lose their quantum information. This process, called decoherence, limits the useful lifetime of a qubit.


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