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Coherent oscillations in a superconducting multilevel quantum system

被引：93
作者：
Claudon, J
Balestro, F
Hekking, FWJ
Buisson, O
机构：
[1] Univ Grenoble 1, Ctr Rech Tres Basses Temp, CNRS, Lab Associe, F-38042 Grenoble 9, France
[2] Delft Univ Technol, Dept Nanosci, NL-2628 CJ Delft, Netherlands
[3] Univ Grenoble 1, CNRS, Lab Phys & Modelisat Milieux Condenses, F-38042 Grenoble 9, France
来源：
PHYSICAL REVIEW LETTERS | 2004年 / 93卷 / 18期
关键词：
D O I：
10.1103/PhysRevLett.93.187003
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We have observed coherent oscillations in a multilevel quantum system, formed by a current-biased dc SQUID. These oscillations have been induced by applying resonant microwave pulses of flux. Quantum measurement is performed by a nanosecond flux pulse that projects the final state onto one of two different voltage states of the dc SQUID, which can be read out. The number of quantum states involved in the coherent oscillations increases with increasing microwave power. The dependence of the oscillation frequency on microwave power deviates strongly from the linear regime expected for a two-level system and can be very well explained by a theoretical model taking into account the anharmonicity of the multilevel system.
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页码：187003 / 1
页数：4
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