Quantum-gate implementation in permanently coupled AF spin rings without need of local fields

Details Quantum-gate implementation in permanently coupled AF spin rings without need of local fields Quantum-gate implementation in permanently coupled AF spin rings without need of local fields

2004-11-04

arxiv.org/abs/cond-mat/0411113v2

Phys. Rev. Lett. 94, 190501 (2005)

Physics

Condensed Matter

Other Condensed Matter

To appear in Physical Review Letters

Scientific paper

10.1103/PhysRevLett.94.190501

We propose a scheme for the implementation of quantum gates which is based on the qubit encoding in antiferromagnetic molecular rings. We show that a proper engineering of the intercluster link would result in an effective coupling that vanishes as far as the system is kept in the computational space, while it is turned on by a selective excitation of specific auxiliary states. These are also shown to allow the performing of single- and two-qubit gates without an individual addressing of the rings by means of local magnetic fields.

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