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The initial decoherence of the mesoscopic Josephson junction flux qubit |
| Su Jie(苏杰), Wang Ji-Suo(王继锁)†, Zhang Xiao-Yan(张晓燕), and Liang Bao-Long(梁宝龙) |
| School of Physics Science and Information Engineering, Liaocheng University, Liaocheng 252059, China |
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Abstract For a mesoscopic radio frequency superconducting quantum interference device (rfSQUID), at a degeneracy point, the system reduces to a quantum two-state system which can be used as a flux qubit. When the noise environment is equivalent to a harmonic oscillators bath, by virtue of an operator-norm measure for the short time decoherence, this paper investigates the initial decoherence of the flux qubit operating in the ohmic noise environment and illustrates its property by means of the numerical evaluation.
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Received: 07 April 2009
Revised: 10 August 2009
Accepted manuscript online:
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PACS:
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85.25.Dq
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(Superconducting quantum interference devices (SQUIDs))
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03.67.Lx
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(Quantum computation architectures and implementations)
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85.25.Cp
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(Josephson devices)
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| Fund: Project supported by the National
Natural Science Foundation of China (Grant No.~10574060) and the
Natural Science Foundation of Shandong Province of China (Grant
No.~Y2008R23). |
Cite this article:
Su Jie(苏杰), Wang Ji-Suo(王继锁), Zhang Xiao-Yan(张晓燕), and Liang Bao-Long(梁宝龙) The initial decoherence of the mesoscopic Josephson junction flux qubit 2010 Chin. Phys. B 19 057301
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