arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2004.04007cond-mat.mes-hallcond-mat.mtrl-sciquant-ph
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固态电子自旋中自旋寿命的极限

The limit of spin lifetime in solid-state electronic spins

Alessandro Lunghi, Stefano Sanvito

摘要:

为量子技术开发自旋量子比特需要保护它们免受有限温度退相干的主要来源:原子振动。在这里,我们消除了在这一领域的进展的主要障碍之一,通过提供一个完整的第一性原理的自旋弛豫,包括两个声子过程的图片。我们的方法是基于机器学习和电子结构理论,并在现实系统中可行的自旋寿命的预测。我们研究了一个典型的钒基分子量子比特,发现高温下的自旋寿命受到拉曼过程的限制,这是由于少量的太赫兹分子内振动。这些发现有效地改变了这类材料中自旋弛豫的传统理解,并为长寿命自旋系统的合理设计开辟了新的途径。

英文摘要:

The development of spin qubits for quantum technologies requires their protection from the main source of finite-temperature decoherence: atomic vibrations. Here we eliminate one of the main barriers to the progress in this field by providing a complete first-principles picture of spin relaxation that includes up to two-phonon processes. Our method is based on machine learning and electronic structure theory and makes the prediction of spin lifetime in realistic systems feasible. We study a prototypical vanadium-based molecular qubit and reveal that the spin lifetime at high temperature is limited by Raman processes due to a small number of THz intra-molecular vibrations. These findings effectively change the conventional understanding of spin relaxation in this class of materials and open new avenues for the rational design of long-living spin systems.

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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