Global Optical Control of a Quantum Spin Chain

Details Global Optical Control of a Quantum Spin Chain Global Optical Control of a Quantum Spin Chain

2005-08-26

arxiv.org/abs/quant-ph/0508192v2

New Journal of Physics 8 69 (2006)

Physics

Quantum Physics

5 pages, 3 figures

Scientific paper

10.1088/1367-2630/8/5/069

Quantum processors which combine the long decoherence times of spin qubits together with fast optical manipulation of excitons have recently been the subject of several proposals. I show here that arbitrary single- and entangling two-qubit gates can be performed in a chain of perpetually coupled spin qubits solely by using laser pulses to excite higher lying states. It is also demonstrated that universal quantum computing is possible even if these pulses are applied {\it globally} to a chain; by employing a repeating pattern of four distinct qubit units the need for individual qubit addressing is removed. Some current experimental qubit systems would lend themselves to implementing this idea.

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