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arXiv 2302.05489cond-mat.mes-hall
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在半导体量子点中实现接近完全极化的核自旋态

Approaching a fully-polarized state of nuclear spins in a semiconductor quantum dot

Peter Millington-Hotze, Harry E. Dyte, Santanu Manna, Saimon F. Covre da Silva, Armando Rastelli, Evgeny A. Chekhovich

AI总结:

针对固态自旋量子比特的核自旋磁噪声问题,提出结合强光泵浦与快速电子隧穿的核自旋极化方案,在GaAs量子点中1分钟内实现超95%的核极化,可简化量子器件实现并支撑多体量子研究。

摘要:

原子核自旋的磁噪声是固态自旋量子比特面临的一大难题。高度极化的核自旋不仅能克服这一障碍,还可使核自旋成为一种有用的量子信息资源。然而,实现足够高的核极化度一直是难以达成的目标。本文中,我们实施了一种结合强光泵浦与快速电子隧穿的核自旋极化方案。在GaAs半导体量子点中,于1分钟的时间尺度内产生了远高于95%的极化度。该技术与标准量子点器件设计相兼容,其中高度极化的核自旋可简化量子比特与量子存储器的实现,还能为多体量子动力学与磁学研究提供测试平台。

英文摘要:

Magnetic noise of atomic nuclear spins is a major problem for solid state spin qubits. Highly-polarized nuclei would not only overcome this obstacle, but also make nuclear spins a useful quantum information resource. However, achieving sufficiently high nuclear polarizations has remained an evasive goal. Here we implement a nuclear spin polarization protocol which combines strong optical pumping and fast electron tunneling. Polarizations well above 95% are generated in GaAs semiconductor quantum dots on a timescale of 1 minute. The technique is compatible with standard quantum dot device designs, where highly-polarized nuclear spins can simplify implementations of quantum bits and memories, as well as offer a testbed for studies of many-body quantum dynamics and magnetism.

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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