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arXiv 2103.01917physics.opticscond-mat.mes-hallphysics.app-phquant-ph
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金刚石中锡空位中心的电调谐

Electrical tuning of tin-vacancy centers in diamond

Shahriar Aghaeimeibodi, Daniel Riedel, Alison E. Rugar, Constantin Dory, Jelena Vuckovic

发表信息：
Phys. Rev. Applied 15, 064010 (2021)
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摘要：

金刚石中的IV族色心由于其优异的光学和自旋特性而作为固态自旋量子比特引起了人们的广泛关注。在这些色心中，锡空位（SnV $^{\,\textrm{-}}$）中心是特别感兴趣的，因为其大的基态分裂使得在高于1 $\,$ K的温度下能够实现长的自旋相干时间。然而，色心通常遭受不均匀的加宽，这可能会因纳米制造引起的应变而加剧，从而阻碍了发射不可区分光子的量子节点的实现。虽然应变和拉曼调谐已被研究作为有前途的技术，以克服不同的IV族色心之间的光谱失配，其他方法需要探索，以找到方法，可以提供更多的本地化控制，而不牺牲发射强度。在这里，我们研究电调谐SnV $^{\,\textrm{-}}$中心的金刚石通过直流斯塔克效应。我们证明了超过1.7 $\,$ GHz的调谐范围。我们观察到二次和线性依赖于所施加的电场。我们还确认，我们观察到的调谐效果是由于所施加的电场，是不同于热调谐由于焦耳加热。斯塔克调谐是克服发射器之间失谐并实现多个相同量子节点的有希望的途径。

英文摘要：

Group-IV color centers in diamond have attracted significant attention as solid-state spin qubits because of their excellent optical and spin properties. Among these color centers, the tin-vacancy (SnV$^{\,\textrm{-}}$) center is of particular interest because its large ground-state splitting enables long spin coherence times at temperatures above 1$\,$K. However, color centers typically suffer from inhomogeneous broadening, which can be exacerbated by nanofabrication-induced strain, hindering the implementation of quantum nodes emitting indistinguishable photons. Although strain and Raman tuning have been investigated as promising techniques to overcome the spectral mismatch between distinct group-IV color centers, other approaches need to be explored to find methods that can offer more localized control without sacrificing emission intensity. Here, we study electrical tuning of SnV$^{\,\textrm{-}}$ centers in diamond via the direct-current Stark effect. We demonstrate a tuning range beyond 1.7$\,$GHz. We observe both quadratic and linear dependence on the applied electric field. We also confirm that the tuning effect we observe is a result of the applied electric field and is distinct from thermal tuning due to Joule heating. Stark tuning is a promising avenue toward overcoming detunings between emitters and enabling the realization of multiple identical quantum nodes.

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