This talk, which aimes for general audiences in physics,
will be consisting of:
1) Introduction to quantum computing including quantitative
comparison of the performance between classical and quantum computers,
2) The current status of the worldwide quantum computer developments,
3) Description of our original idea of constructing quantum computers
using silicon [1, 2], and
4) The current status of solid-state experimental research leading to
our silicon quantum computers. [3-7]

[1] T. D. Ladd, J. R. Goldman, F. Yamaguchi, Y. Yamamoto, E.Abe,
and K. M. Itoh, \"An All Silicon Quantum Computer,\"
Phys. Rev. Lett. 89, 017901 (2002).
[2] News in Nature web site:
http://www.nature.com/news/2002/020617/full/020617-3.html
[3] E. Abe, K. M. Itoh, J. Isoya, and S. Yamasaki, \"Electron Spin Phase
Relaxation of Phosphorus Donors in Nuclear Spin Enriched Silicon,\"
Phys. Rev. B, 70, 033204 (2004).
[4] T.D. Ladd, D. Maryenko, Y. Yamamoto, E.Abe, and K. M. Itoh,
\"Coherence Time of a Solid-State Nuclear Qubit,\"quant-ph/0309164 v1,
Sept. 23, 2003, Phys. Rev. B, submitted.
[5] T. Kojima, K. M. Itoh, and Y. Shiraki, \"Growth and Characterization
of 28Si_n/30Si_n Isotope Superlattices,\" Appl. Phys. Lett. 83, 2318-2320 (2003).
[6] K. M. Itoh, J. Kato, F. Uemura, A.K. Kaliteyevskii, O.N.Godisov, G. G. Devyatych,
A.D. Bulanov, A. V. Gusev, I.D. Kovalev, P. G. Sennikov, H -J. Pohl, N.V. Abrosimov,
and H. Riemann \"High Purity Isotopically Enriched 29Si and 30Si Single Crystals:
Isotope Separation, Purification, and Growth,\" Jpn. J. Appl. Phys.
Pt. 1, 42, 6248-6251 (2003).
[7] A. S. Verhulst, D. Maryenko, Y. Yamamoto, and K. M. Itoh, \"Double and Single Peaks
in Nuclear Magnetic Resonance Spectra of Natural and 29Si Enriched Single Crystal Silicon,\"
Phys. Rev. B, 68, 054105 (2003).