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arXiv 1802.07147quant-ph
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实用脉冲工程:无矩阵指数化的梯度上升

Practical Pulse Engineering: Gradient Ascent Without Matrix Exponentiation

Gaurav Bhole, Jonathan A. Jones

摘要:

自2005年以来,在诸如NMR量子信息处理器的系统中使用工程控制脉冲来执行期望的量子操作已经有了巨大的增长。这些方法建立在原始梯度上升脉冲工程(GRAPE)算法的基础上,由于需要计算控制脉冲中的每个时间步长的矩阵指数,因此仍然是计算密集型的。在这里,我们讨论如何传播的每个时间步可以近似使用Trotter-铃木公式,并通过避免不必要的操作实现进一步的速度。由此产生的程序可以得到一个相当大的速度增益与传播误差可以忽略不计的成本,提供了一个更实用的方法来脉冲工程。

英文摘要:

Since 2005 there has been a huge growth in the use of engineered control pulses to perform desired quantum operations in systems such as NMR quantum information processors. These approaches, which build on the original gradient ascent pulse engineering (GRAPE) algorithm, remain computationally intensive because of the need to calculate matrix exponentials for each time step in the control pulse. Here we discuss how the propagators for each time step can be approximated using the Trotter--Suzuki formula, and a further speed up achieved by avoiding unnecessary operations. The resulting procedure can give a substantial speed gain with negligible cost in propagator error, providing a more practical approach to pulse engineering.

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。

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