arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2204.02147quant-ph
收藏

利用多色脉冲串实现高保真量子控制

High-fidelity quantum control by polychromatic pulse trains

Svetoslav S. Ivanov, Boyan T. Torosov, Nikolay V. Vitanov

摘要:

我们介绍了一种使用多色脉冲序列(PPS)的量子控制技术,该多色脉冲序列由具有不同载波频率的脉冲组成,即相对于量子比特跃迁频率的不同失谐。我们得到许多PPS,产生宽带,窄带和通带激发配置文件不同的目标跃迁概率。这使得可以创建高保真激发分布,其(i)对实验参数的偏差是鲁棒的,这对于量子计算是有吸引力的,或者(ii)对这种变化更敏感,这对于串扰消除和量子传感是有吸引力的。实验证明,该方法使用IBM的超导量子处理器之一,在一个非常好的协议之间的理论和实验。这些结果证明了IBM量子比特的优异相干特性以及所提出的量子控制技术的准确性、鲁棒性和灵活性。他们还表明,失谐是作为有效的控制参数的脉冲相位,通常用于复合脉冲。因此,该方法为相位操纵困难或不准确的领域的量子控制开辟了各种前景。

英文摘要:

We introduce a quantum control technique using polychromatic pulse sequences (PPS), consisting of pulses with different carrier frequencies, i.e. different detunings with respect to the qubit transition frequency. We derive numerous PPS, which generate broadband, narrowband, and passband excitation profiles for different target transition probabilities. This makes it possible to create high-fidelity excitation profiles which are either (i) robust to deviations in the experimental parameters, which is attractive for quantum computing, or (ii) more sensitive to such variations, which is attractive for cross talk elimination and quantum sensing. The method is demonstrated experimentally using one of IBM's superconducting quantum processors, in a very good agreement between theory and experiment. These results demonstrate both the excellent coherence properties of the IBM qubits and the accuracy, robustness and flexibility of the proposed quantum control technique. They also show that the detuning is as efficient control parameter as the pulse phase that is commonly used in composite pulses. Hence the method opens a variety of perspectives for quantum control in areas where phase manipulation is difficult or inaccurate.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑