1. See, for example, Quantum Information Science and Technology Roadmap, available from http://qist.lanl.gov
2. M.A. Nielsen, I.L. Chuang, Quantum Computation and Quantum Information (Cambridge University Press, Cambridge, 2000)
3. D.P. DiVincenzo, Fortschr. Phys. 85, 25 (2000)
4. L.M.K. Vandersypen, M. Steffen, G. Breyta, C.S. Yannoni, R. Cleve, I. Chuang, Phys. Rev. Lett. 85, 25 (2000)
5. H. Häffner, W. Hänsel, C.F. Roos, J. Benhelm, D. Chek-al-kar, M. Chwalla, T. Körber, U.D. Rapol, M. Riebe, P.O. Schmidt, C. Becher, O. Gühne, W. Dür, R. Blatt, Nature 438, 643 (2005)