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Under the limit Wj ≫ Wc , a qubit can also be realized with superconducting nano-circuits. The qubit is opposite to charge qubits.
As the magnetic flux qubits are larger than the charge qubits, the condition makes them easier to fabricate and test.
The flux qubit dynamics is governed by the superconducting phase difference across the junction rather than by the charge. The flux qubit consists of a SQUID as a macro-quantum coherent system.
