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arXiv 2202.07889quant-ph
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三能级系统中高保真布居转移的复合脉冲

Composite pulses for high fidelity population transfer in three-level systems

Zhi-Cheng Shi, Cheng Zhang, Du Ran, Yan Xia, Reuven Ianconescu, Aharon Friedman, X. X. Yi, Shi-Biao Zheng

摘要:

在这项工作中,我们提出了一个复合脉冲方案,通过调制相位,以实现高保真的三能级系统中的人口转移。为了克服转移概率中引入的系统误差不能充分消除的问题,提出了一种代价函数来寻找最优值。该代价函数在保证目标状态的精确布居或抑制泄漏状态的布居或两者中独立地构造。结果表明,即使在耦合系数存在偏差的情况下,粒子数转移仍能以高保真度实现。此外,我们的复合脉冲方案可以扩展到任意长的脉冲序列。作为一个例子,我们采用复合脉冲序列在原子-腔系统中实现了三原子单重态的量子保真度。最终的单态显示出对偏差的鲁棒性,并且不会受到波形失真的严重影响。此外,单重态在退相干环境下保持高保真度。

英文摘要:

In this work, we propose a composite pulses scheme by modulating phases to achieve high fidelity population transfer in three-level systems. To circumvent the obstacle that not enough variables are exploited to eliminate the systematic errors in the transition probability, we put forward a cost function to find the optimal value. The cost function is independently constructed either in ensuring an accurate population of the target state, or in suppressing the population of the leakage state, or both of them. The results demonstrate that population transfer is implemented with high fidelity even when existing the deviations in the coupling coefficients. Furthermore, our composite pulses scheme can be extensible to arbitrarily long pulse sequences. As an example, we employ the composite pulses sequence for achieving the three-atom singlet state in an atom-cavity system with ultrahigh fidelity. The final singlet state shows robustness against deviations and is not seriously affected by waveform distortions. Also, the singlet state maintains a high fidelity under the decoherence environment.

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