Coherent Josephson Qubit Suitable for Scalable Quantum Integrated Circuits

被引：612

作者：

Barends, R. ^{[1
]}

Kelly, J. ^{[1
]}

Megrant, A. ^{[1
]}

Sank, D. ^{[1
]}

Jeffrey, E. ^{[1
]}

Chen, Y. ^{[1
]}

Yin, Y. ^{[1
]}

Chiaro, B. ^{[1
]}

Mutus, J. ^{[1
]}

Neill, C. ^{[1
]}

O'Malley, P. ^{[1
]}

Roushan, P. ^{[1
]}

Wenner, J. ^{[1
]}

White, T. C. ^{[1
]}

Cleland, A. N. ^{[1
]}

Martinis, John M. ^{[1
]}

机构：

[1] Univ Calif Santa Barbara, Dept Phys, Santa Barbara, CA 93106 USA

来源：

PHYSICAL REVIEW LETTERS | 2013年 / 111卷 / 08期

基金：

美国国家科学基金会;

关键词：

Timing circuits;

D O I：

10.1103/PhysRevLett.111.080502

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We demonstrate a planar, tunable superconducting qubit with energy relaxation times up to 44 mu s. This is achieved by using a geometry designed to both minimize radiative loss and reduce coupling to materials-related defects. At these levels of coherence, we find a fine structure in the qubit energy lifetime as a function of frequency, indicating the presence of a sparse population of incoherent, weakly coupled two-level defects. We elucidate this defect physics by experimentally varying the geometry and by a model analysis. Our "Xmon'' qubit combines facile fabrication, straightforward connectivity, fast control, and long coherence, opening a viable route to constructing a chip-based quantum computer.

引用

页数：5

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