Universal quantum computation with spin-1/2 pairs and Heisenberg exchange

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  • 15 January 2001
Abstract
An efficient and intuitive scheme for universal quantum computation is presented that employs pairs of spin-1/2 particles with different magnetic coupling constants as quantum bits. At the expense of a factor of two increase in spin devices comes the ability to perform universal quantum computation using only the Heisenberg exchange interaction and a static uniform magnetic field. In contrast to quantum bits employing three spins, no increase in the number of gate operations is required to produce controlled-NOT and other universal gate operations. The simplicity and adaptability of this approach should make it attractive for spin-based quantum computing architectures.

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