Combined encoding and decoupling solution to problems of decoherence and design in solid-state quantum computing

Details Combined encoding and decoupling solution to problems of decoherence and design in solid-state quantum computing Combined encoding and decoupling solution to problems of decoherence and design in solid-state quantum computing

2001-12-10

arxiv.org/abs/quant-ph/0112054v2

Phys. Rev. Lett. 89, 047901 (2002)

Physics

Quantum Physics

5 pages, Revtex4, updated, shortened version to appear in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.89.047901

Proposals for scalable quantum computing devices suffer not only from decoherence due to the interaction with their environment, but also from severe engineering constraints. Here we introduce a practical solution to these major concerns, addressing solid state proposals in particular. Decoherence is first reduced by encoding a logical qubit into two qubits, then completely eliminated by an efficient set of decoupling pulse sequences. The same encoding removes the need for single-qubit operations, that pose a difficult design constraint. We further show how the dominant decoherence processes can be identified empirically, in order to optimize the decoupling pulses.

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