Physics – Condensed Matter – Superconductivity
Scientific paper
2002-04-06
Quantum Information Processing 1, 155 (2002)
Physics
Condensed Matter
Superconductivity
Replaced with published version
Scientific paper
We introduce simple qubit-encodings and logic gates which eliminate the need for certain difficult single-qubit operations in superconducting phase-qubits, while preserving universality. The simplest encoding uses two physical qubits per logical qubit. Two architectures for its implementation are proposed: one employing N physical qubits out of which N/2 are ancillas fixed in the |1> state, the other employing N/2+1 physical qubits, one of which is a bus qubit connected to all others. Details of a minimal set of universal encoded logic operations are given, together with recoupling schemes, that require nanosecond pulses. A generalization to codes with higher ratio of number of logical qubits per physical qubits is presented. Compatible decoherence and noise suppression strategies are also discussed.
Blais Alexandre
Lidar Daniel A.
Wu Lian-Ao
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