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Spectroscopy of low...
Spectroscopy of low-frequency noise and its temperature dependence in a superconducting qubit
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- Yan, F. (författare)
- Massachusetts Institute of Technology (MIT)
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- Bylander, Jonas, 1978 (författare)
- Massachusetts Institute of Technology (MIT)
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- Gustavsson, S. (författare)
- Massachusetts Institute of Technology (MIT)
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- Yoshihara, F. (författare)
- RIKEN
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- Harrabi, K. (författare)
- RIKEN,King Fahd University of Petroleum and Minerals
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- Cory, D.G. (författare)
- University of Waterloo
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- Orlando, T.P. (författare)
- Massachusetts Institute of Technology (MIT)
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- Nakamura, Y. (författare)
- University of Tokyo, Japan,RIKEN
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- Tsai, J.S. (författare)
- RIKEN
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- Oliver, W.D. (författare)
- Massachusetts Institute of Technology (MIT)
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(creator_code:org_t)
- 2012
- 2012
- Engelska.
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Ingår i: Physical Review B - Condensed Matter and Materials Physics. - 2469-9950 .- 2469-9969. ; 85:17, s. 174521-
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https://doi.org/10.1...
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Abstract
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- 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.
Ämnesord
- TEKNIK OCH TEKNOLOGIER -- Nanoteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Nano-technology (hsv//eng)
- NATURVETENSKAP -- Fysik -- Den kondenserade materiens fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Condensed Matter Physics (hsv//eng)
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Yan, F.
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Bylander, Jonas, ...
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Gustavsson, S.
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Yoshihara, F.
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Harrabi, K.
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Cory, D.G.
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visa fler...
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Orlando, T.P.
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Nakamura, Y.
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Tsai, J.S.
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Oliver, W.D.
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visa färre...
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- TEKNIK OCH TEKNOLOGIER
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TEKNIK OCH TEKNO ...
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och Nanoteknik
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NATURVETENSKAP
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och Fysik
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