Nature 393, 133-137 (14 May 1998) | doi:10.1038/30156; Received 10 November 1997; Accepted 24 February 1998

A silicon-based nuclear spin quantum computer

B. E. Kane1

  1. Semiconductor Nanofabrication Facility, School of Physics, University of New South Wales, Sydney 2052, Australia

Correspondence to: B. E. Kane1 Correspondence should be addressed to the author (e-mail: Email:


Quantum computers promise to exceed the computational efficiency of ordinary classical machines because quantum algorithms allow the execution of certain tasks in fewer steps. But practical implementation of these machines poses a formidable challenge. Here I present a scheme for implementing a quantum-mechanical computer. Information is encoded onto the nuclear spins of donor atoms in doped silicon electronic devices. Logical operations on individual spins are performed using externally applied electric fields, and spin measurements are made using currents of spin-polarized electrons. The realization of such a computer is dependent on future refinements of conventional silicon electronics.