Improved Superconducting Qubit Readout by Qubit-Induced Nonlinearities

被引：107

作者：

Boissonneault, Maxime ^{[1
]}

Gambetta, J. M. ^{[2
,3
]}

Blais, Alexandre ^{[1
]}

机构：

[1] Univ Sherbrooke, Dept Phys, Sherbrooke, PQ J1K 2R1, Canada

[2] Univ Waterloo, Inst Quantum Comp, Waterloo, ON N2L 3G1, Canada

[3] Univ Waterloo, Dept Phys & Astron, Waterloo, ON N2L 3G1, Canada

来源：

PHYSICAL REVIEW LETTERS | 2010年 / 105卷 / 10期

基金：

加拿大自然科学与工程研究理事会;

关键词：

Compendex;

D O I：

10.1103/PhysRevLett.105.100504

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

In dispersive readout schemes, qubit-induced nonlinearity typically limits the measurement fidelity by reducing the signal-to-noise ratio (SNR) when the measurement power is increased. Contrary to seeing the nonlinearity as a problem, here we propose to use it to our advantage in a regime where it can increase the SNR. We show analytically that such a regime exists if the qubit has a many-level structure. We also show how this physics can account for the high-fidelity avalanchelike measurement recently reported by Reed et al.

引用

页数：4

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