Comprehensive encoding and decoupling solution to problems of decoherence and design in solid-state quantum computing.
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, which pose a difficult design constraint. We further show how the dominant decoherence processes can be identified empirically, in order to optimize the decoupling pulses.
Byrd
Mark S
MS
Chemical Physics Theory Group, University of Toronto, 80 St. George Street, Toronto, Ontario, Canada M5S 3H6.
Lidar
Daniel A
DA