Quantum information processing in a spin-bus system of coupled chains

Details Quantum information processing in a spin-bus system of coupled chains Quantum information processing in a spin-bus system of coupled chains

2008-03-06

arxiv.org/abs/0803.0768v1

Physics

Quantum Physics

13 pages, 3 figures

Scientific paper

10.1103/PhysRevA.78.044302

The effective Heisenberg interaction of long distance is constructed in spin qubits connected to a bus of two strongly coupled chains. Universal quantum computation can be realized on the basis of the bus which always keeps frozen at the ground state. It is found that the effective interaction is primarily determined by the energy spectra of the bus. With the variation of the distance between two connecting nodes, the interaction alternately occurs between antiferromagnetic and ferromagnetic ones. The long range interaction can also be attained in coupled infinite chains. The quantum gate operations with the high precision are implemented in the condition of quantum fluctuations.

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