Magnetic field compatible circuit quantum electrodynamics with graphene Josephson junctions.
Magnetic field compatible circuit quantum electrodynamics with graphene Josephson junctions.
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DOI：
10.1038/s41467-018-07124-x
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发表时间：
2018-11-05
影响因子：
16.6
通讯作者：
Kouwenhoven LP
中科院分区：
文献类型：
--
作者：
Kroll JG;Uilhoorn W;van der Enden KL;de Jong D;Watanabe K;Taniguchi T;Goswami S;Cassidy MC;Kouwenhoven LP
电路量子电动力学已被证明是探测混合系统中介观效应的强大工具，并用于几个量子计算（QC）提案，这些提案需要能够在强磁场中运行的transmon量子位。为了解决这个问题，我们将单层石墨烯约瑟夫森结集成到微波频率超导电路中，以创建基于石墨烯的transmons。使用色散微波光谱，我们解决了石墨烯的特征频带色散，并观察相干电子干涉效应，确认我们的石墨烯约瑟夫森结的弹道性质。我们表明，石墨烯的单原子厚度使设备对施加的磁场不敏感，使我们能够在1 T的平行磁场中执行电路的能级光谱，比以前的研究高一个数量级。这些结果建立了基于石墨烯的超导电路作为一个有前途的平台，QC和强磁场中出现的介观量子效应的研究。对磁场不敏感的transmon量子比特是拓扑量子计算中的关键元素。在这里，Kroll等人通过将单层石墨烯约瑟夫森结集成到微波频率超导电路中来创建石墨烯transmons，使它们能够在1T的平行磁场中运行。
Circuit quantum electrodynamics has proven to be a powerful tool to probe mesoscopic effects in hybrid systems and is used in several quantum computing (QC) proposals that require a transmon qubit able to operate in strong magnetic fields. To address this we integrate monolayer graphene Josephson junctions into microwave frequency superconducting circuits to create graphene based transmons. Using dispersive microwave spectroscopy we resolve graphene’s characteristic band dispersion and observe coherent electronic interference effects confirming the ballistic nature of our graphene Josephson junctions. We show that the monoatomic thickness of graphene renders the device insensitive to an applied magnetic field, allowing us to perform energy level spectroscopy of the circuit in a parallel magnetic field of 1 T, an order of magnitude higher than previous studies. These results establish graphene based superconducting circuits as a promising platform for QC and the study of mesoscopic quantum effects that appear in strong magnetic fields. A transmon qubit insensitive to magnetic fields is a crucial element in topological quantum computing. Here, Kroll et al. create graphene transmons by integrating monolayer graphene Josephson junctions into microwave frequency superconducting circuits, allowing them to operate in a parallel magnetic field of 1 T.
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