**Quantum computers are machines that use the properties of quantum physics to store data and perform computations.**- Classical computers, which include smartphones and laptops, encode information in binary
**“bits”**that can either be 0s or 1s. In a quantum computer, the basic unit of memory is a**quantum bit or qubit.**Qubits are made using physical systems, such as the spin of an electron or the orientation of a photon. - These systems can be in many different arrangements all at once,
**a property known as quantum superposition.**Qubits can also be inextricably linked together using a phenomenon called**quantum entanglement**. The result is that a series of qubits can represent different things simultaneously.

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- In situations where there are a large number of possible combinations,
**quantum computers can consider them simultaneously.***Examples include trying to find the prime factors of a very large number or the best route between two places.* - However, there may also be
**plenty of situations where classical computers will still outperform quantum ones**. So the computers of the future may be a combination of both these types. - For now,
**quantum computers are highly sensitive: heat, electromagnetic fields, and collisions with air molecules can cause a qubit to lose its quantum properties.**This process, known as quantum decoherence, causes the system to crash, and it happens more quickly the more particles that are involved.

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