New material platform for superconducting transmon qubits with coherence times exceeding 0.3 milliseconds.
New material platform for superconducting transmon qubits with coherence times exceeding 0.3 milliseconds.
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DOI：
10.1038/s41467-021-22030-5
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发表时间：
2021-03-19
影响因子：
16.6
通讯作者：
Houck AA
中科院分区：
文献类型：
--
作者：
Place APM;Rodgers LVH;Mundada P;Smitham BM;Fitzpatrick M;Leng Z;Premkumar A;Bryon J;Vrajitoarea A;Sussman S;Cheng G;Madhavan T;Babla HK;Le XH;Gang Y;Jäck B;Gyenis A;Yao N;Cava RJ;de Leon NP;Houck AA
超导传输量子比特是量子计算和量子科学的领先平台。基于transmon量子位构建大型、有用的量子系统将需要显著改进量子位弛豫和相干时间，这比组成材料的体积特性所施加的限制要短几个数量级。这表明松弛可能源于不受控制的表面、界面和污染物。以前提高量子比特寿命的努力主要集中在最小化表面影响的设计上。然而，多年来，二维transmon量子位寿命的重大改进仍然难以捉摸。在这里，我们通过在器件中用钽代替铌，制造了具有超过0.3毫秒的动态去耦寿命和相干时间的二维transmon量子位。我们已经观察到17个器件的寿命增加，表明这些材料的改进是稳健的，为多量子位处理器中更高的门保真度铺平了道路。基于超导传输量子比特的量子计算机受到单个量子比特寿命和相干时间的限制，这比块状材料特性所施加的限制短了几个数量级。在这里，作者通过用钽代替铌，制造了寿命和相干时间都超过0.3毫秒的二维transmon量子位。
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. Quantum computers based on superconducting transmon qubits are limited by single qubit lifetimes and coherence times, which are orders of magnitude shorter than limits imposed by bulk material properties. Here, the authors fabricate two-dimensional transmon qubits with both lifetimes and coherence times longer than 0.3 milliseconds by replacing niobium with tantalum in the device.
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影响因子：
2.6
作者：
BRAGINSKY, VB;ILCHENKO, VS;BAGDASSAROV, KS
通讯作者：
BAGDASSAROV, KS
影响因子：
5
作者：
Hite, D. A.;Colombe, Y.;Pappas, D. P.
通讯作者：
Pappas, D. P.
影响因子：
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作者：
Barends, R.;Kelly, J.;Martinis, John M.
通讯作者：
Martinis, John M.
影响因子：
64.8
作者：
Arute, Frank;Arya, Kunal;Martinis, John M.
通讯作者：
Martinis, John M.
影响因子：
3.9
作者：
Dwikusuma, F;Saulys, D;Kuech, TF
通讯作者：
Kuech, TF