1/f Flux noise in Josephson phase qubits

Radoslaw C. Bialczak; R. McDermott; M. Ansmann; M. Hofheinz; N. Katz; Erik Lucero; Matthew Neeley; A. D. O'Connell; H. Wang; A. N. Cleland; John M. Martinis

doi:10.1103/PhysRevLett.99.187006

1/f Flux noise in Josephson phase qubits

Radoslaw C. Bialczak^*, R. McDermott, M. Ansmann, M. Hofheinz, N. Katz, Erik Lucero, Matthew Neeley, A. D. O'Connell, H. Wang, A. N. Cleland, John M. Martinis

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

173 Scopus citations

Abstract

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.

Original language	English
Article number	187006
Journal	Physical Review Letters
Volume	99
Issue number	18
DOIs	https://doi.org/10.1103/PhysRevLett.99.187006
State	Published - 2 Nov 2007
Externally published	Yes

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10.1103/PhysRevLett.99.187006

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title = "1/f Flux noise in Josephson phase qubits",

abstract = "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.",

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AU - McDermott, R.

AU - Ansmann, M.

AU - Hofheinz, M.

AU - Katz, N.

AU - Lucero, Erik

AU - Neeley, Matthew

AU - O'Connell, A. D.

AU - Wang, H.

AU - Cleland, A. N.

AU - Martinis, John M.

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AB - 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.

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1/f Flux noise in Josephson phase qubits

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