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Quantum Noise in the Josephson Charge Qubit

Research output: Contribution to journalJournal articlepeer-review

  • Oleg V. Astafiev
  • Yuri Pashkin
  • Y. Nakamura
  • T. Yamamoto
  • Jaw-Shen Tsai
Article number267007
<mark>Journal publication date</mark>31/12/2004
<mark>Journal</mark>Physical review letters
Issue number26
Number of pages4
Publication StatusPublished
Early online date22/12/04
<mark>Original language</mark>English


We study decoherence of the Josephson charge qubit by measuring energy relaxation and dephasing with help of the single-shot readout. We found that the dominant energy relaxation process is a spontaneous emission induced by quantum noise coupled to the charge degree of freedom. Spectral density of the noise at high frequencies is roughly proportional to the qubit excitation energy