Spectroscopy of superconducting charge qubits coupled by a Josephson inductance

被引：28

作者：

Yamamoto, T. ^{[1
,2
]}

Watanabe, M. ^{[2
]}

You, J. Q. ^{[2
,3
,4
]}

Pashkin, Yu. A. ^{[1
,2
]}

Astafiev, O. ^{[1
,2
]}

Nakamura, Y. ^{[1
,2
]}

Nori, F. ^{[2
,5
]}

Tsai, J. S. ^{[1
,2
]}

机构：

[1] NEC Nano Elect Res Lab, Tsukuba, Ibaraki 3058501, Japan

[2] RIKEN, Inst Phys & Chem Res, Wako, Saitama 3510198, Japan

[3] Fudan Univ, Dept Phys, Shanghai 200433, Peoples R China

[4] Fudan Univ, Surface Phys Lab Natl Key Lab, Shanghai 200433, Peoples R China

[5] Univ Michigan, Dept Phys, Ctr Theoret Phys, Ctr Study Complex Syst, Ann Arbor, MI 48109 USA

来源：

PHYSICAL REVIEW B | 2008年 / 77卷 / 06期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1103/PhysRevB.77.064505

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We have designed and experimentally implemented a circuit of inductively coupled superconducting charge qubits, where a Josephson junction is used as an inductance, and the coupling between the qubits is controlled by an applied magnetic flux. Spectroscopic measurements on the circuit are in good agreement with theoretical calculations. We observed anticrossings which originate from the coupling between the qubit and the plasma mode of the Josephson junction. Moreover, the size of the anticrossing depends on the external magnetic flux, which demonstrates the controllability of the coupling.

引用

页数：8

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