Probing interacting two-level systems with rare-earth ions

被引：5

作者：

Ding, Dapeng ^{[1
]}

van Driel, David ^{[1
]}

Pereira, Lino M. C. ^{[2
]}

Bauters, Jared F. ^{[3
]}

Heck, Martijn J. R. ^{[3
]}

Welker, Gesa ^{[1
]}

de Dood, Michiel J. A. ^{[1
]}

Vantomme, Andre ^{[2
]}

Bowers, John E. ^{[3
]}

Loffler, Wolfgang ^{[1
]}

Bouwmeester, Dirk ^{[1
,4
]}

机构：

[1] Leiden Univ, Huygens Kamerlingh Onnes Lab, NL-2333 CA Leiden, Netherlands

[2] Katholieke Univ Leuven, Inst Kern Stralingsfys, B-3001 Leuven, Belgium

[3] Univ Calif Santa Barbara, Dept Elect & Comp Engn, Santa Barbara, CA 93106 USA

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

来源：

PHYSICAL REVIEW B | 2020年 / 101卷 / 01期

基金：

荷兰研究理事会;

关键词：

1.5; MU-M; THERMAL-CONDUCTIVITY; PHOTON-ECHOES; LASER; GLASSES; SILICON; STATES; HEAT;

D O I：

10.1103/PhysRevB.101.014209

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Two-level systems (TLS) in amorphous materials limit coherence times of a number of solid-state quantum devices. Interactions between TLS become prominent below 100 mK, but the coupling mechanism and statistical properties are still unclear. Here we determine the homogeneous linewidth of ytterbium ions (Yb3+) in silica glass at 10-80 mK by using photon echo techniques as a probe of TLS. First, the homogeneous linewidth can be reduced by applying a magnetic field of 0.3 T. This effect is due to reduced magnetic interactions between adjacent Yb3+. Secondly, we observe saturation of the linewidth below 50 mK to a level of approximately 30 kHz, which is much larger than the lifetime-limited value of 0.2 kHz. This saturation behavior is in conflict with the coupling to independent TLS. We show that this effect can be explained by coherently coupled TLS.

引用

页数：8

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