Multiphoton excitations and inverse population in a system of two flux qubits

被引：16

作者：

Il'ichev, E. ^{[1
]}

Shevchenko, S. N. ^{[2
]}

van der Ploeg, S. H. W. ^{[1
]}

Grajcar, M. ^{[1
,3
]}

Temchenko, E. A. ^{[2
,4
]}

Omelyanchouk, A. N. ^{[2
]}

Meyer, H. -G. ^{[1
]}

机构：

[1] Inst Photon Technol, D-07702 Jena, Germany

[2] B Verkin Inst Low Temp Phys & Engn, UA-61103 Kharkov, Ukraine

[3] Comenius Univ, Dept Expt Phys, SK-84248 Bratislava, Slovakia

[4] Kharkov Natl Univ, UA-61077 Kharkov, Ukraine

来源：

PHYSICAL REVIEW B | 2010年 / 81卷 / 01期

基金：

俄罗斯基础研究基金会;

关键词：

SUPERCONDUCTING QUBIT; ARTIFICIAL-ATOM; CHARGE QUBITS; QUANTUM BITS;

D O I：

10.1103/PhysRevB.81.012506

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We study the multiphoton spectroscopy of artificial solid-state four-level quantum system. This system is formed by two coupled superconducting flux qubits. When multiple driving frequency of the applied microwaves matches the energy difference between any two levels, the transition to the upper level is induced. We demonstrate two types of the multiphoton transitions: direct transitions between two levels and ladder-type transitions via an intermediate level. Our calculations show, that for the latter transitions, in particular, the inverse population of the excited state with respect to the ground one is realized. These processes can be useful for the control of the level population for the multilevel scalable quantum systems.

引用

页数：4

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