Quantum Noise in the Josephson Charge Qubit
O. Astafiev, Yu. A. Pashkin, Y. Nakamura, T. Yamamoto, J. S. Tsai
DOI 10.1103/PhysRevLett.93.267007 · Physical Review Letters
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Abstract
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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