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By collecting statistics during measurements spanning multiple days, we find the mean parameters $$\\overline {T_1}$$ T 1 ¯ = 49 μs and $$\\overline {T_2^ \\ast }$$ T 2 * ¯ = 95 μs; however, both of these quantities fluctuate, explaining the need for frequent re-calibration in qubit setups. Our main finding is that fluctuations in qubit relaxation are local to the qubit and are caused by instabilities of near-resonant two-level-systems (TLS). Through statistical analysis, we determine sub-millihertz switching rates of these TLS and observe the coherent coupling between an individual TLS and a transmon qubit. Finally, we find evidence that the qubit’s frequency stability produces a 0.8 ms limit on the pure dephasing which we also observe. 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Decoherence benchmarking of superconducting qubits 论文

Decoherence benchmarking of superconducting qubits · 相关技术