Efficient quantum computation within a disordered Heisenberg spin-chain

Details Efficient quantum computation within a disordered Heisenberg spin-chain Efficient quantum computation within a disordered Heisenberg spin-chain

2004-04-29

arxiv.org/abs/quant-ph/0404163v3

Phys. Rev. A 70, 052322 (2004)

Physics

Quantum Physics

To appear in Phys. Rev. A

Scientific paper

10.1103/PhysRevA.70.052322

We 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.

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