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§ Why Superconductors？
A main merit of micro-quantum systems such as atoms, spins, photons, etc is that they can be easily isolated from the environment. Accordingly, they can reduce decoherence.
Meanwhile, the demerit is that integration of many qubits into a more complex circuit is required to build a practical computer.
From the viewpoint, quantum systems offer much flexibility to design a quantum computer with standard integrated circuit technologies.
Already proposed macro-qubits are based on nano-structured electronic circuits, they may be composed of quantum dots or ‘superconducting Josephson junctions’ .
