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Abstract: We have studied decoherence in a system where two Josephson-junction fluxqubits share a part of their superconducting loops and are inductively coupled.By tuning the flux bias condition, we control the sensitivities of the energylevels to flux noises in each qubit. The dephasing rate of the first excitedstate is enhanced or suppressed depending on the amplitudes and the signs ofthe sensitivities. We have quantified the $1-f$ flux noises and theircorrelations and found that the dominant contribution is by local fluctuations.



Author: Fumiki Yoshihara, Yasunobu Nakamura, Jaw-Shen Tsai

Source: https://arxiv.org/







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