# 6 Real-world quantum computing

Quantum computing presents enormous technical challenges, which is why there many research groups and companies working on quantum computers and many competing technologies. Each of these technologies has its advantages and disadvantages.

Even though large systems are built of atoms and molecules that are well-described by quantum mechanics, large complicated systems such as computers or people don’t exhibit the quintessential quantum behaviour such as superposition or entanglement.

OpenLearn - Introduction to quantum computing
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