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Photon-assisted tunneling and charge dephasing in a carbon nanotube double quantum dot

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  • A Mavalankar
  • T Pei
  • E M Gauger
  • J H Warner
  • G A D Briggs
  • E A Laird
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Article number235428
<mark>Journal publication date</mark>15/06/2016
<mark>Journal</mark>Physical review B
Issue number23
Volume93
Number of pages6
Publication StatusPublished
<mark>Original language</mark>English

Abstract

We report microwave-driven photon-assisted tunneling in a suspended carbon nanotube double quantum dot. From the resonant linewidth at a temperature of 13 mK, the charge-dephasing time is determined to be 280 ± 30 ps. The linewidth is independent of driving frequency, but increases with increasing temperature. The moderate temperature dependence is inconsistent with expectations from electron-phonon coupling alone, but consistent with charge noise arising in the device. The extracted level of charge noise is comparable with that expected from previous measurements of a valley-spin qubit, where it was hypothesized to be the main cause of qubit decoherence. Our results suggest a possible route towards improved valley-spin qubits.

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©2016 American Physical Society