Chapter 17. Silicon-Based Quantum Computation

  1. Prof. Dr. Samuel L. Braunstein2,
  2. Dr. Hoi-Kwong Lo3 and
  3. Pieter Kok Assistant Editor2
  1. B. E. Kane

Published Online: 28 JAN 2005

DOI: 10.1002/3527603182.ch17

Scalable Quantum Computers: Paving the Way to Realization

Scalable Quantum Computers: Paving the Way to Realization

How to Cite

Kane, B. E. (2000) Silicon-Based Quantum Computation, in Scalable Quantum Computers: Paving the Way to Realization (eds S. L. Braunstein, H.-K. Lo and P. Kok), Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim, FRG. doi: 10.1002/3527603182.ch17

Editor Information

  1. 2

    University of Wales, Bangor, UK

  2. 3

    MagiQ Technologies, Inc., New York, USA

Author Information

  1. Laboratory for Physical Sciences, University of Maryland, College Park, MD 20740, USA

Publication History

  1. Published Online: 28 JAN 2005
  2. Published Print: 20 DEC 2000

ISBN Information

Print ISBN: 9783527403219

Online ISBN: 9783527603183



  • silicon-based quantum computation


An architecture for a quantum computer is presented in which spins associated with donors in silicon function as qubits. Quantum operations on the spins are performed using a combination of voltages applied to gates adjacent to the spins and radio frequency magnetic fields applied resonant with spin transitions. Initialization and measurement of electron spins is made by electrostatic probing of a two electron system, whose orbital configuration must depend on the spin states of the electrons because of the Pauli Principle. Specific devices will be discussed which perform all the necessary operations for quantum computing, with an emphasis placed on a qualitative presentation of the principles underlying their operation.

The likely impediments to achieving large-scale quantum computation using this architecture will be addressed: the computer must operate at extremely low temperature, must be fabricated from devices built with near atomic precision, and will require extremely accurate gating operations in order to perform quantum logic. Refinements to the computer architecture will be presented which could remedy each of these deficiencies. I will conclude by discussing a possible specific realization of the computer using Si/SixGe1-x heterostructures into which donors are deposited using a low energy focused ion beam.