Quantum computing with spin cluster qubits

Details Quantum computing with spin cluster qubits Quantum computing with spin cluster qubits

2002-06-17

arxiv.org/abs/cond-mat/0206310v2

Phys. Rev. Lett. 90, 047901 (2003)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 3 figures; extended discussion

Scientific paper

10.1103/PhysRevLett.90.047901

We study the low energy states of finite spin chains with isotropic (Heisenberg) and anisotropic (XY and Ising-like) exchange interaction with uniform and non-uniform coupling constants. We show that for an odd number of sites a spin cluster qubit can be defined in terms of the ground state doublet. This qubit is remarkably insensitive to the placement and coupling anisotropy of spins within the cluster. One- and two-qubit quantum gates can be generated by magnetic fields and inter-cluster exchange, and leakage during quantum gate operation is small. Spin cluster qubits inherit the long decoherence times and short gate operation times of single spins. Control of single spins is hence not necessary for the realization of universal quantum gates.

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