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transmon
In quantum computing, a transmon is a type of superconducting charge qubit that was designed to have reduced sensitivity to charge noise. The transmon was developed by scientists at Yale University in 2007.〔J. Koch ''et al.'', "Charge-insensitive qubit design derived from the Cooper pair box," ''Phys. Rev. A'' 76, 04319 (2007), , (arXiv:0703002 )〕〔J.A. Schreier ''et al.'', "Suppressing charge noise decoherence in superconducting charge qubits," ''Phys. Rev. B'' 77, 180502 (2008), , (arXiv:0712.3581 )〕 Its name is an abbreviation of the term ''transmission line shunted plasma oscillation qubit''.
The transmon achieves its reduced sensitivity to charge noise by significantly increasing the ratio of the Josephson energy to the charging energy. This is accomplished through the use of a large shunting capacitor. The result is energy level spacings that are approximately independent of offset charge. Planar on-chip transmon qubits have T1 coherence times ~ 30 μs to 40 μs.〔R. Barends ''et al.'', "Coherent Josephson Qubit Suitable for Scalable Quantum Integrated Circuits," ''Phys. Re. Lett.'', 111, (2013), , (arXiv:1304:2322 )〕 By replacing the superconducting transmission line cavity with a three-dimensional superconducting cavity, recent work on transmon qubits has shown significantly improved T1 times, as long as 95 μs.〔H. Paik ''et al.'', "Observation of high coherence in Josephson junction qubits measured in a three-dimensional circuit QED architecture," ''Phys. Rev. Lett.'' 107, 240501 (2011), , (arXiv:1105.4652 )〕〔C. Rigetti ''et al.'', "Superconducting qubit in waveguide cavity with coherence time approaching 0.1 ms," ''Phys. Rev. B'' 86, 100506(R) (2012), , (arXiv:1202.5533 )〕 These results demonstrate that previous T1 times were not limited by Josephson junction losses. Understanding the fundamental limits on the coherence time in superconducting qubits such as the transmon is an active area of research.
== See also ==
*Circuit quantum electrodynamics (CQED)
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