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Quantum noise in the Josephson charge qubit
classification
❄️ cond-mat.mes-hall
cond-mat.supr-con
keywords
chargeenergynoisequbitjosephsonquantumrelaxationcoupled
read the original 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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