Journal
QUANTUM INFORMATION PROCESSING
Volume 8, Issue 2-3, Pages 105-115Publisher
SPRINGER
DOI: 10.1007/s11128-009-0100-6
Keywords
Superconducting qubits; Transmon; Quantum computation
Funding
- University via a Quantum Information and Mesoscopic
- NSA [W911NF-05-1-0365]
- NSF [DMR-0653377, DMR-0603369]
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We review the main theoretical and experimental results for the transmon, a superconducting charge qubit derived from the Cooper pair box. The increased ratio of the Josephson to charging energy results in an exponential suppression of the transmon's sensitivity to 1/f charge noise. This has been observed experimentally and yields homogeneous broadening, negligible pure dephasing, and long coherence times of up to 3 mu s. Anharmonicity of the energy spectrum is required for qubit operation, and has been proven to be sufficient in transmon devices. Transmons have been implemented in a wide array of experiments, demonstrating consistent and reproducible results in very good agreement with theory.
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