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arXiv 1602.04551quant-phcond-mat.mes-hallphysics.ins-det
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主时钟稳定性在可扩展量子信息处理中的作用

The role of master clock stability in scalable quantum information processing

H. Ball, W. D. Oliver, M. J. Biercuk

摘要:

寻求提高量子比特相干寿命的实验学家通常专注于通过例如改进量子比特设计和材料以及系统与环境扰动的隔离来减轻退相干机制。然而,在量子叠加中的相位自由度的情况下,必须保持的相干性不仅仅是量子比特内部的相干性,而是必须包括量子比特相对于管理其控制系统的“主时钟”(例如本地振荡器)的相干性。在这篇手稿中,我们阐明了主时钟中的不稳定性对量子比特相位相干性的影响,并提供了计算这些过程对量子比特误差的贡献的工具。我们首先将标准振荡器相位噪声度量与其相应的量子位退相谱密度相连接。然后,我们使用有代表性的实验室级和性能级振荡器规格来计算操作保真度边界上的捕获离子和超导量子比特相对较慢和较快的操作时间。我们讨论了这些界限在当代实验和未来的大规模量子信息系统的量子纠错的相关性,并讨论了潜在的手段,以提高主时钟的稳定性。

英文摘要:

Experimentalists seeking to improve the coherent lifetimes of quantum bits have generally focused on mitigating decoherence mechanisms through, for example, improvements to qubit designs and materials, and system isolation from environmental perturbations. In the case of the phase degree of freedom in a quantum superposition, however, the coherence that must be preserved is not solely internal to the qubit, but rather necessarily includes that of the qubit relative to the "master clock" (e.g. a local oscillator) that governs its control system. In this manuscript we articulate the impact of instabilities in the master clock on qubit phase coherence, and provide tools to calculate the contributions to qubit error arising from these processes. We first connect standard oscillator phase-noise metrics to their corresponding qubit dephasing spectral densities. We then use representative lab-grade and performance-grade oscillator specifications to calculate operational fidelity bounds on trapped-ion and superconducting qubits with relatively slow and fast operation times. We discuss the relevance of these bounds for quantum error correction in contemporary experiments and future large-scale quantum information systems, and discuss potential means to improve master clock stability.

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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