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Temperature Square Dependence of the Low Frequency 1=f Charge Noise in the Josephson Junction Qubits

Astafiev, Oleg V. and Pashkin, Yuri and Nakamura, Y. and Yamamoto, T. and Tsai, Jaw-Shen (2006) Temperature Square Dependence of the Low Frequency 1=f Charge Noise in the Josephson Junction Qubits. Physical Review Letters, 96 (13). ISSN 0031-9007

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Abstract

To verify the hypothesis about the common origin of the low-frequency 1 / f noise and the quantum f noise recently measured in the Josephson charge qubits, we study the temperature dependence of the 1 / f noise and decay of coherent oscillations. The T 2 dependence of the 1 / f noise is experimentally demonstrated, which supports the hypothesis. We also show that dephasing in the Josephson charge qubits off the electrostatic energy degeneracy point is consistently explained by the same low-frequency 1 / f noise that is observed in the transport measurements.

Item Type: Article
Journal or Publication Title: Physical Review Letters
Subjects:
Departments: Faculty of Science and Technology > Physics
ID Code: 84738
Deposited By: ep_importer_pure
Deposited On: 20 Feb 2017 11:20
Refereed?: Yes
Published?: Published
Last Modified: 21 Sep 2017 02:00
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/84738

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