Active suppression of dephasing in Josephson-junction qubits

Details Active suppression of dephasing in Josephson-junction qubits Active suppression of dephasing in Josephson-junction qubits

2002-12-05

arxiv.org/abs/cond-mat/0212127v1

Physics

Condensed Matter

4 pages, 1 figure

Scientific paper

10.1134/1.1644314

Simple majority code correcting $k$ dephasing errors by encoding a qubit of information into $2k+1$ physical qubits is studied quantitatively. We derive an equation for quasicontinuous evolution of the density matrix of encoded quantum information under the error correction procedure in the presence of dephasing noise that in general can be correlated at different qubits. Specific design of the Josephson-junction circuit implementing this scheme is suggested.

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