arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1507.08993quant-phcond-mat.mes-hallphysics.atom-phphysics.optics
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固态自旋量子比特中Berry相位的光学操纵

Optical manipulation of Berry phase in a solid-state spin qubit

Christopher G. Yale, F. Joseph Heremans, Brian B. Zhou, Adrian Auer, Guido Burkard, David D. Awschalom

摘要:

量子态之间的相位关系是量子信息存储和处理的重要资源。虽然量子相位通常通过调整能量相互作用来动态控制,但利用在循环演化期间累积的几何相位可以提供对噪声的优异鲁棒性。迄今为止,固态系统中的几何相位控制的演示依赖于具有有限空间分辨率的微波场。在这里,我们展示了一个全光学方法的基础上受激拉曼绝热通过积累的几何相位,贝瑞相,在一个单独的氮空位(NV)中心的金刚石。使用衍射限制的激光,我们引导NV中心的自旋沿着布洛赫球上的环路,以封闭任意Berry相位,并通过时间分辨的状态层析来表征这些轨迹。我们调查这种控制的限制,由于损失的绝热性和消相干,以及它的鲁棒性噪声故意引入到实验控制参数,发现它的弹性是独立的贝里相封闭的量。这些技术为未来实现由光链接和控制的固态量子比特光子网络的光学几何操作奠定了基础。

英文摘要:

The phase relation between quantum states represents an essential resource for the storage and processing of quantum information. While quantum phases are commonly controlled dynamically by tuning energetic interactions, utilizing geometric phases that accumulate during cyclic evolution may offer superior robustness to noise. To date, demonstrations of geometric phase control in solid-state systems rely on microwave fields that have limited spatial resolution. Here, we demonstrate an all-optical method based on stimulated Raman adiabatic passage to accumulate a geometric phase, the Berry phase, in an individual nitrogen-vacancy (NV) center in diamond. Using diffraction-limited laser light, we guide the NV center's spin along loops on the Bloch sphere to enclose arbitrary Berry phase and characterize these trajectories through time-resolved state tomography. We investigate the limits of this control due to loss of adiabiaticity and decoherence, as well as its robustness to noise intentionally introduced into the experimental control parameters, finding its resilience to be independent of the amount of Berry phase enclosed. These techniques set the foundation for optical geometric manipulation in future implementations of photonic networks of solid state qubits linked and controlled by light.

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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