1/f flux noise in Josephson phase qubits

被引：173

作者：

Bialczak, Radoslaw C. ^{[1
]}

McDermott, R.

Ansmann, M.

Hofheinz, M.

Katz, N.

Lucero, Erik

Neeley, Matthew

O'Connell, A. D.

Wang, H.

Cleland, A. N.

Martinis, John M.

机构：

[1] Univ Calif Santa Barbara, Dept Phys, Santa Barbara, CA 93106 USA

[2] Univ Wisconsin, Dept Phys, Madison, WI 53706 USA

来源：

PHYSICAL REVIEW LETTERS | 2007年 / 99卷 / 18期

关键词：

D O I：

10.1103/PhysRevLett.99.187006

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We present a new method to measure 1/f noise in Josephson quantum bits (qubits) that yields low-frequency spectra below 1 Hz. A comparison of the noise taken at positive and negative bias of a phase qubit shows the dominant noise source to be flux noise and not junction critical-current noise, with a magnitude similar to that measured previously in other systems. Theoretical calculations show that the level of flux noise is not compatible with the standard model of noise from two-level state defects in the surface oxides of the films.

引用

页数：4

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