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arXiv 2102.12469quant-phcond-mat.mtrl-sci
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低维范德华材料中自旋量子比特的衬底控制动力学

Substrate-controlled dynamics of spin qubits in low dimensional van-der-Waals materials

Mykyta Onizhuk, Giulia Galli

摘要:

我们报告的自旋量子比特的相干动力学在二维材料(2DM)和范德华异质结的理论研究,作为主机的厚度和周围环境的组成的函数。我们重点研究了MoS $_2$和WS $_2$这两个具有量子技术应用前景的系统,并考虑了自旋量子比特与核自旋相互作用所引起的退相干.我们表明,哈恩回声相干时间由量子位宿主中的退相干源和环境中的退相干源之间的复杂相互作用决定,这反过来又决定了噪声演化是处于经典还是量子力学状态。我们建议,封装量子位主机的范德华异质结构的组成和厚度可以被设计为最大化相干时间。最后,我们讨论了量子传感器如何能够探测2DM中核浴的动态。

英文摘要:

We report a theoretical study of the coherence dynamics of spin qubits in two-dimensional materials (2DMs) and van-der-Waals heterostructures, as a function of the host thickness and the composition of the surrounding environment. We focus on MoS$_2$ and WS$_2$, two promising systems for quantum technology applications, and we consider the decoherence arising from the interaction of the spin qubit with nuclear spins. We show that the Hahn-echo coherence time is determined by a complex interplay between the source of decoherence in the qubit host and in the environment, which in turn determines whether the noise evolution is in a classical or quantum mechanical regime. We suggest that the composition and thickness of van-der-Waals heterostructures encapsulating a qubit host can be engineered to maximize coherence times. Finally, we discuss how quantum sensors may be able to probe the dynamics of the nuclear bath in 2DMs.

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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