State permutations from manipulation of near level-crossings

Details State permutations from manipulation of near level-crossings State permutations from manipulation of near level-crossings

2002-04-23

arxiv.org/abs/quant-ph/0204136v2

Phys.Rev. A68 (2003) 032307

Physics

Quantum Physics

6 pages, 5 figures. Substantial revision and extension of the introduction and the atoms-in-a-cavity sections

Scientific paper

10.1103/PhysRevA.68.032307

We discuss some systematic methods for implementing state manipulations in systems formally similar to chains of a few spins with nearest-neighbor interactions, arranged such that there are strong and weak scales of coupling links. States are permuted by means of bias potentials applied to a few selected sites. This generic structure is then related to an atoms-in-a-cavity model that has been proposed in the literature as a way of achieving a decoherence free subspace. A new method using adiabatically varying laser detuning to implement a CNOT gate in this model is proposed.

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