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Quantum Codes for Simplifying Design and Suppressing Decoherence in Superconducting Phase-Qubits | | Daniel A. Lidar
; Lian-Ao Wu
; Alexandre Blais
; | | Date: |
6 Apr 2002 | | Journal: | Quantum Information Processing 1, 155 (2002) | | Subject: | Superconductivity | cond-mat.supr-con quant-ph | | Affiliation: | University of Toronto, University of Sherbrooke | | Abstract: | 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. | | Source: | arXiv, cond-mat/0204153 | | Services: | Forum | Review | PDF | Favorites | |
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