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Resonant effects in a SQUID qubit subjected to nonadiabatic changes

机译:受非绝热变化影响的SQUID量子位中的共振效应

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摘要

By quickly modifying the shape of the effective potential of a double SQUID flux qubit from a single-well to a double-well condition, we experimentally observe an anomalous behavior, namely, an alternation of resonance peaks, in the probability to find the qubit in a given flux state. The occurrence of Landau-Zener transitions as well as resonant tunneling between degenerate levels in the two wells may be invoked to partially justify the experimental results. A quantum simulation of the time evolution of the system indeed suggests that the observed anomalous behavior can be imputable to quantum coherence effects. The interplay among all these mechanisms has a practical implication for quantum computing purposes, giving a direct measurement of the limits on the sweeping rates possible for a correct manipulation of the qubit state by means of fast flux pulses, avoiding transitions to noncomputational states.
机译:通过快速修改双SQUID通量量子位从单井到双井条件的有效电位的形状,我们通过实验观察到异常行为,即共振峰的交替,从而找到了给定的通量状态。可以调用Landau-Zener跃迁的发生以及两个井的简并水位之间的共振隧穿,以部分证明实验结果的合理性。系统时间演化的量子模拟确实表明,观察到的异常行为可以归因于量子相干效应。所有这些机制之间的相互作用对量子计算具有实际意义,可以通过快速通量脉冲直接测量量子速率状态的限度,以正确控制量子位状态,从而避免过渡到非计算态。

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