1. Nielsen, M. A. & Chuang, I. L. Quantum Computation and Quantum Information (Cambridge Univ. Press, 2000).
2. Leggett, A. J. Prog. Theor. Phys. 69 (suppl.), 80 (1980).
3. Devoret, M. H., Martinis, J. M. & Clarke, J. Phys. Rev. Lett. 55, 1908–1911 (1985).
4. Clarke, J., Cleland, A. N., Devoret, M. H., Esteve, D. & Martinis, J. M. Science 239, 992–997 (1988).
5. Devoret, M. H. et al. in Quantum Tunnelling in Condensed Media (eds Kagan, Y. & Leggett, A. J.) (Elsevier, Amsterdam, 1992)