Measurements of decoherence times in a Josephson charge qubit using fast pulses

We study decoherence of a Josephson charge qubit using fast pulses to perform qubit rotations. The gate charge dependence of the decoherence rate indicates that the low frequency fluctuations affecting the qubit are from charges distributed with a 1/f-type spectrum. Assuming the form Sq(w) = alpha/(...

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Bibliographic Details
Published inJournal of low temperature physics Vol. 136; no. 5-6; pp. 453 - 463
Main Authors DUTY, T, BLADH, K, GUNNARSSON, D, DELSING, P
Format Conference Proceeding Journal Article
LanguageEnglish
Published Heidelberg Springer 01.09.2004
Subjects
Applied sciences
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Electronics
Exact sciences and technology
Physics
Proximity effects, weak links, tunneling phenomena, and Josephson effects
Proximity effects, weak links, tunneling phenomena, and josephson effects, adreev effect, sn and sns junctions
Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices
Superconducting devices
Superconductivity
Fluctuations
1/f noise
Josephson junction
Quantum computer
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Summary:We study decoherence of a Josephson charge qubit using fast pulses to perform qubit rotations. The gate charge dependence of the decoherence rate indicates that the low frequency fluctuations affecting the qubit are from charges distributed with a 1/f-type spectrum. Assuming the form Sq(w) = alpha/(w)=alpha/|w|, we find root alpha = 4 x 10-3e, which is slightly higher than the value found from very low frequency noise measurements.
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ObjectType-Conference Paper-1
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ISSN:0022-2291
1573-7357
DOI:10.1023/B:JOLT.0000041277.03323.1d