Quantum noise in the josephson charge qubit.

@article{Astafiev2004QuantumNI,
  title={Quantum noise in the josephson charge qubit.},
  author={O. Astafiev and Yu. A. Pashkin and Yasunobu Nakamura and Takahiro Yamamoto and J. S. Tsai},
  journal={Physical review letters},
  year={2004},
  volume={93 26 Pt 1},
  pages={267007}
}
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. 
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