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There are two possibilities for constructing qubits.
Those differences depend on the principle to encode quantum informations.
The first approach is based on very small Josephson junctions, which are operated by maintaining coherence between individual states of electron Cooper pairs.
This type of qubits is called a charge qubit. The charge states of a small superconducting island ( so-called electron box ) are used as the basis states of this qubit.
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