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Superconducting qubit in a waveguide cavity with a coherence time approaching 0.1 ms

机译:波导腔中的超导量子位,相干时间接近0.1 ms

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摘要

We report a superconducting artificial atom with a coherence time of 7_2~* = 92 μs and energy relaxation time T_1 = 70 μs. The system consists of a single Josephson junction transmon qubit on a sapphire substrate embedded in an otherwise empty copper waveguide cavity whose lowest eigenmode is dispersively coupled to the qubit transition. We attribute the factor of four increase in the coherence quality factor relative to previous reports to device modifications aimed at reducing qubit dephasing from residual cavity photons. This simple device holds promise as a robust and easily produced artificial quantum system whose intrinsic coherence properties are sufficient to allow tests of quantum error correction.
机译:我们报道了一个超导人工原子,其相干时间为7_2〜* = 92μs,能量弛豫时间T_1 = 70μs。该系统由蓝宝石衬底上的单个约瑟夫逊结跨位量子比特组成,该蓝宝石衬底嵌入否则为空的铜波导腔中,其最低本征模分散地耦合到量子比特跃迁。我们将相干品质因数相对于以前的报告增加了四倍,归因于旨在减少残留腔光子的量子比特相移的设备修改。这种简单的设备有望成为一种坚固且易于生产的人工量子系统,其固有相干特性足以进行量子误差校正测试。

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