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04 July 2020
 
  » arxiv » quant-ph/0404163

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Efficient quantum computation within a disordered Heisenberg spin-chain
Chiu Fan Lee ; Neil F. Johnson ;
Date 29 Apr 2004
Journal Phys. Rev. A 70, 052322 (2004) DOI: 10.1103/PhysRevA.70.052322
Subject Quantum Physics; Materials Science | quant-ph cond-mat.mtrl-sci
AbstractWe show that efficient quantum computation is possible using a disordered Heisenberg spin-chain with `always-on’ couplings. Such disorder occurs naturally in nanofabricated systems. Considering a simple chain setup, we show that an arbitrary two-qubit gate can be implemented using just three relaxations of a controlled qubit, which amounts to switching the on-site energy terms at most twenty-one times.
Source arXiv, quant-ph/0404163
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