Phys. Rev. A 68, 032307 (2003) [6 pages]State permutations from manipulation of near-level-crossingsReceived 14 February 2003; revised 23 June 2003; published 15 September 2003 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 method using adiabatically varying laser detuning to implement a controlled NOT gate in this model is proposed. © 2003 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevA.68.032307
DOI:
10.1103/PhysRevA.68.032307
PACS:
03.67.-a, 03.65.Xp, 05.50.+q, 42.50.-p
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