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The second, alternative approach relies on the macro-quantum coherence between magnetic flux states in relatively large Josephson junction circuits.
The latter qubits is known as the magnetic flux ( phase ) qubit.
In fact, the flux qubit is based on a special realization of a SQUID ( Superconducting QUantum Interference Device ).
Please refer to an up-to-date review devoted to such a field by means of superconducting nano-circuits published by Makhlim, Schon and Shnirman ( 2001 ).
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