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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
materials science
Spectroscopy of low-frequency noise and its temperature dependence in a superconducting qubit
Physical Review B - Condensed Matter and Materials Physics, Volume 85, No. 17, Article 174521, Year 2012
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Description
We report a direct measurement of the low-frequency noise spectrum in a superconducting flux qubit. Our method uses the noise sensitivity of a free-induction Ramsey interference experiment, comprising free evolution in the presence of noise for a fixed period of time followed by single-shot qubit-state measurement. Repeating this procedure enables Fourier-transform noise spectroscopy with access to frequencies up to the achievable repetition rate, a regime relevant to dephasing in ensemble-averaged time-domain measurements such as Ramsey interferometry. Rotating the qubit's quantization axis allows us to measure two types of noise: effective flux noise and effective critical-current or charge noise. For both noise sources, we observe that the very same 1/f-type power laws measured at considerably higher frequencies (0.2-20 MHz) are consistent with the noise in the 0.01-100-Hz range measured here. We find no evidence of temperature dependence of the noises over 65-200 mK, and also no evidence of time-domain correlations between the two noises. These methods and results are pertinent to the dephasing of all superconducting qubits. © 2012 American Physical Society.
Authors & Co-Authors
Yan, F.
United States, Cambridge
Massachusetts Institute of Technology
Bylander, J.
United States, Cambridge
Massachusetts Institute of Technology
Gustavsson, S.
United States, Cambridge
Massachusetts Institute of Technology
Yoshihara, F.
Japan, Wako
Riken the Institute of Physical and Chemical Research
Harrabi, Khallil
Japan, Wako
Riken the Institute of Physical and Chemical Research
Saudi Arabia, Dhahran
King Fahd University of Petroleum and Minerals
Cory, David G.
Canada, Waterloo
University of Waterloo
Canada, Waterloo
Perimeter Institute for Theoretical Physics
Orlando, T. P.
United States, Cambridge
Massachusetts Institute of Technology
Nakamura, Y.
Japan, Wako
Riken the Institute of Physical and Chemical Research
Japan, Tokyo
Nec Corporation
Japan, Tokyo
University of Tokyo, Research Center for Advanced Science and Technology
Tsai, Jaw Shen
Japan, Wako
Riken the Institute of Physical and Chemical Research
Japan, Tokyo
Nec Corporation
Oliver, W. D.
United States, Cambridge
Massachusetts Institute of Technology
United States, Lexington
Lincoln Laboratory
Statistics
Citations: 56
Authors: 10
Affiliations: 8
Identifiers
Doi:
10.1103/PhysRevB.85.174521
ISSN:
10980121
e-ISSN:
1550235X
Research Areas
Health System And Policy
Study Approach
Quantitative