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arXiv 1203.3733quant-ph
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多量子比特门的随机基准测试

Randomized Benchmarking of Multi-Qubit Gates

J. P. Gaebler, A. M. Meier, T. R. Tan, R. Bowler, Y. Lin, D. Hanneke, J. D. Jost, J. P. Home, E. Knill, D. Leibfried, D. J. Wineland

摘要:

随着量子信息处理的实验平台不断成熟,表征可以应用于其量子比特(qubit)的酉门的质量变得至关重要。最终,质量必须足够高,以支持任意长的量子计算。随机基准测试已经提供了一种独立于平台的方法来评估单量子比特旋转的质量。在这里,我们描述了这种方法的扩展到多量子位门。我们提供了一个独立于平台的协议,用于评估实验Clifford幺正的性能,形成了容错量子计算的基础。我们用捕获离子双量子位相位门和单量子位门实现了基准测试协议,并发现$0.162 \pm 0.008$的每个随机双量子位Clifford幺正的错误,从而为这种幺正设置了第一个基准。通过在每一步使用额外的两个量子比特相位门来实现第二组序列,我们提取了$0.069 \pm 0.017$的每个相位门的误差。我们进行了这些实验与可移动的,同情冷却离子在多区保罗陷阱-一个系统,原则上可以缩放到更大数量的离子。

英文摘要:

As experimental platforms for quantum information processing continue to mature, characterization of the quality of unitary gates that can be applied to their quantum bits (qubits) becomes essential. Eventually, the quality must be sufficiently high to support arbitrarily long quantum computations. Randomized benchmarking already provides a platform-independent method for assessing the quality of one-qubit rotations. Here we describe an extension of this method to multi-qubit gates. We provide a platform-independent protocol for evaluating the performance of experimental Clifford unitaries, which form the basis of fault-tolerant quantum computing. We implemented the benchmarking protocol with trapped-ion two-qubit phase gates and one-qubit gates and found an error per random two-qubit Clifford unitary of $0.162 \pm 0.008$, thus setting the first benchmark for such unitaries. By implementing a second set of sequences with an extra two-qubit phase gate at each step, we extracted an error per phase gate of $0.069 \pm 0.017$. We conducted these experiments with movable, sympathetically cooled ions in a multi-zone Paul trap - a system that can in principle be scaled to larger numbers of ions.

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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