Strong hole-photon coupling in planar Ge for probing charge degree and strongly correlated states

IF 14.7 1区综合性期刊 Q1 MULTIDISCIPLINARY SCIENCES Nature Communications Pub Date : 2024-11-23 DOI:10.1038/s41467-024-54520-7

Franco De Palma, Fabian Oppliger, Wonjin Jang, Stefano Bosco, Marián Janík, Stefano Calcaterra, Georgios Katsaros, Giovanni Isella, Daniel Loss, Pasquale Scarlino

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Abstract

Semiconductor quantum dots (QDs) in planar germanium (Ge) heterostructures have emerged as front-runners for future hole-based quantum processors. Here, we present strong coupling between a hole charge qubit, defined in a double quantum dot (DQD) in planar Ge, and microwave photons in a high-impedance (Z_r = 1.3 kΩ) resonator based on an array of superconducting quantum interference devices (SQUIDs). Our investigation reveals vacuum-Rabi splittings with coupling strengths up to g₀/2π = 260 MHz, and a cooperativity of C ~ 100, dependent on DQD tuning. Furthermore, utilizing the frequency tunability of our resonator, we explore the quenched energy splitting associated with strong Coulomb correlation effects in Ge QDs. The observed enhanced coherence of the strongly correlated excited state signals the presence of distinct symmetries within related spin functions, serving as a precursor to the strong coupling between photons and spin-charge hybrid qubits in planar Ge. This work paves the way towards coherent quantum connections between remote hole qubits in planar Ge, required to scale up hole-based quantum processors.

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平面 Ge 中的强空穴-光子耦合，用于探测电荷度和强相关态

平面锗（Ge）异质结构中的半导体量子点（QDs）已成为未来基于空穴的量子处理器的领跑者。在这里，我们展示了平面锗中双量子点（DQD）定义的空穴电荷量子比特与基于超导量子干涉器件（SQUID）阵列的高阻抗（Zr = 1.3 kΩ）谐振器中的微波光子之间的强耦合。我们的研究揭示了真空-拉比分裂，耦合强度高达 g0/2π = 260 MHz，合作度为 C ~ 100，取决于 DQD 的调谐。此外，我们还利用谐振器的频率可调性，探索了与 Ge QD 中强库仑相关效应相关的淬火能量分裂。观察到的强相关激发态相干性增强，表明相关自旋函数中存在不同的对称性，这是平面 Ge 中光子与自旋电荷混合量子比特之间强耦合的前兆。这项工作为实现平面 Ge 中远程空穴量子比特之间的相干量子连接铺平了道路，而这正是扩展基于空穴的量子处理器所必需的。

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来源期刊

Nature Communications Biological Science Disciplines-

CiteScore

24.90

自引率

2.40%

发文量

6928

审稿时长

3.7 months

期刊介绍： Nature Communications, an open-access journal, publishes high-quality research spanning all areas of the natural sciences. Papers featured in the journal showcase significant advances relevant to specialists in each respective field. With a 2-year impact factor of 16.6 (2022) and a median time of 8 days from submission to the first editorial decision, Nature Communications is committed to rapid dissemination of research findings. As a multidisciplinary journal, it welcomes contributions from biological, health, physical, chemical, Earth, social, mathematical, applied, and engineering sciences, aiming to highlight important breakthroughs within each domain.