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### Quantum computer

A quantum computer performs calculations with qubits.

##### Explanation

A qubit (comes from: **quantum bit**) is the quantum mechanical version of a bit, and has two basic states, ket 0 and ket 1. That looks a lot like the numbers 0 and 1, which you can store in a bit. A bit has a value of 0 **or** 1 but not both values simultaneously.

A qubit is a unit of quantum information. Superposition enables multiple qubits to express different strings. So can e.g. four qubits have the value 1010 as well as the value 1101.

In a quantum byte (8 qubits) you can store 256 strings, which you then can read out again separately due to their entanglement.