Quantum noise in the Josephson charge qubit

Details Quantum noise in the Josephson charge qubit Quantum noise in the Josephson charge qubit

2004-11-09

arxiv.org/abs/cond-mat/0411216v1

Phys. Rev. Lett. 93, 267007 (2004)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Submitted to Phys. Rev. Letters

Scientific paper

10.1103/PhysRevLett.93.267007

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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