论文标题
连贯时间超过0.3毫秒的超导量子盘的新材料平台
New material platform for superconducting transmon qubits with coherence times exceeding 0.3 milliseconds
论文作者
论文摘要
超导Transmon Qubit是量子计算和量子科学的领先平台。建立基于Transmon Qubits的大型量子系统将需要显着改善量子放松和相干时间，这比组成材料的批量特性所施加的限制短。这表明松弛可能起源于不受控制的表面，界面和污染物。以前的改善量子生命的努力主要集中在最大程度地减少表面贡献的设计上。然而，几年来，二维跨速度量子矩的寿命一直无法使用。在这里，我们通过在设备中用tantalum替换尼伯群来制造具有寿命和相干时间的二维跨速量量子，并具有超过0.3毫秒。我们已经观察到了十七个设备的寿命增加，表明这些物质改进是可靠的，为多Qubit处理器中更高的栅极保真度铺平了道路。
The superconducting transmon qubit is a leading platform for quantum computing and quantum science. Building large, useful quantum systems based on transmon qubits will require significant improvements in qubit relaxation and coherence times, which are orders of magnitude shorter than limits imposed by bulk properties of the constituent materials. This indicates that relaxation likely originates from uncontrolled surfaces, interfaces, and contaminants. Previous efforts to improve qubit lifetimes have focused primarily on designs that minimize contributions from surfaces. However, significant improvements in the lifetime of two-dimensional transmon qubits have remained elusive for several years. Here, we fabricate two-dimensional transmon qubits that have both lifetimes and coherence times with dynamical decoupling exceeding 0.3 milliseconds by replacing niobium with tantalum in the device. We have observed increased lifetimes for seventeen devices, indicating that these material improvements are robust, paving the way for higher gate fidelities in multi-qubit processors.
