Fast Accurate State Measurement with Superconducting Qubits

被引：297

作者：

Jeffrey, Evan ^{[1
]}

Sank, Daniel ^{[1
]}

Mutus, J. Y. ^{[1
]}

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

Kelly, J. ^{[1
]}

Barends, R. ^{[1
]}

Chen, Y. ^{[1
]}

Chen, Z. ^{[1
]}

Chiaro, B. ^{[1
]}

Dunsworth, A. ^{[1
]}

Megrant, A. ^{[1
]}

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

Neill, C. ^{[1
]}

Roushan, P. ^{[1
]}

Vainsencher, A. ^{[1
]}

Wenner, J. ^{[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 | 2014年 / 112卷 / 19期

关键词：

JOSEPHSON-JUNCTION; QUANTUM;

D O I：

10.1103/PhysRevLett.112.190504

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Faster and more accurate state measurement is required for progress in superconducting qubit experiments with greater numbers of qubits and advanced techniques such as feedback. We have designed a multiplexed measurement system with a bandpass filter that allows fast measurement without increasing environmental damping of the qubits. We use this to demonstrate simultaneous measurement of four qubits on a single superconducting integrated circuit, the fastest of which can be measured to 99.8% accuracy in 140 ns. This accuracy and speed is suitable for advanced multiqubit experiments including surface-code error correction.

引用

页数：5

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