Measurement-Induced State Transitions in a Superconducting Qubit: Beyond the Rotating Wave Approximation

被引：131

作者：

Sank, Daniel ^{[1
]}

Chen, Zijun ^{[2
]}

Khezri, Mostafa ^{[3
,4
]}

Kelly, J. ^{[1
]}

Barends, R. ^{[1
]}

Campbell, B. ^{[2
]}

Chen, Y. ^{[1
]}

Chiaro, B. ^{[2
]}

Dunsworth, A. ^{[2
]}

Fowler, A. ^{[1
]}

Jeffrey, E. ^{[1
]}

Lucero, E. ^{[1
]}

Megrant, A. ^{[1
]}

Mutus, J. ^{[1
]}

Neeley, M. ^{[1
]}

Neill, C. ^{[2
]}

O'Malley, P. J. J. ^{[2
]}

Quintana, C. ^{[2
]}

Roushan, P. ^{[1
]}

Vainsencher, A. ^{[1
]}

White, T. ^{[1
]}

Wenner, J. ^{[2
]}

Korotkov, Alexander N. ^{[3
]}

Martinis, John M. ^{[1
,2
]}

机构：

[1] Google Inc, Santa Barbara, CA 93117 USA

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

[3] Univ Calif Riverside, Dept Elect & Comp Engn, Riverside, CA 92521 USA

[4] Univ Calif Riverside, Dept Phys, Riverside, CA 92521 USA

来源：

PHYSICAL REVIEW LETTERS | 2016年 / 117卷 / 19期

基金：

美国国家科学基金会;

关键词：

ERROR-DETECTION; QUANTUM; CIRCUIT; BIT;

D O I：

10.1103/PhysRevLett.117.190503

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Many superconducting qubit systems use the dispersive interaction between the qubit and a coupled harmonic resonator to perform quantum state measurement. Previous works have found that such measurements can induce state transitions in the qubit if the number of photons in the resonator is too high. We investigate these transitions and find that they can push the qubit out of the two-level subspace, and that they show resonant behavior as a function of photon number. We develop a theory for these observations based on level crossings within the Jaynes-Cummings ladder, with transitions mediated by terms in the Hamiltonian that are typically ignored by the rotating wave approximation. We find that the most important of these terms comes from an unexpected broken symmetry in the qubit potential. We confirm the theory by measuring the photon occupation of the resonator when transitions occur while varying the detuning between the qubit and resonator.

引用

页数：6

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