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Strong photon coupling to the quadrupole moment of an electron in a solid-state qubit
Nature Physics ( IF 19.6 ) Pub Date : 2020-05-11 , DOI: 10.1038/s41567-020-0862-4
J. V. Koski , A. J. Landig , M. Russ , J. C. Abadillo-Uriel , P. Scarlino , B. Kratochwil , C. Reichl , W. Wegscheider , Guido Burkard , Mark Friesen , S. N. Coppersmith , A. Wallraff , K. Ensslin , T. Ihn

The fundamental concept of light–matter interaction is routinely realized by coupling the quantized electric field in a cavity to the dipole moment of a real or an artificial atom. A recent proposal1,2, motivated by the prospect of overcoming the decohering effects of distant charge fluctuations, suggests that introduction of and coupling to an electric quadrupole moment of a single electron can be achieved by confining it in a triple quantum dot. Here, we show an experimental realization of this concept by connecting a superconducting microwave resonator to the middle of the three dots, such that the dipole coupling becomes negligible. We demonstrate strong coupling to the electron quadrupole moment and determine that the coherence of our system is limited by short-range charge noise. Our experiment enables the construction and detection of a complex electronic state of a single electron in a solid-state environment that does not exist as such for a free electron.



中文翻译:

强光子耦合到固态量子位中电子的四极矩

光-质相互作用的基本概念通常是通过将空腔中的量子化电场耦合到真实或人工原子的偶极矩来实现的。最近的提案1,2受克服远距离电荷波动的退相干影响的前景启发,表明将单个电子限制在三量子点中可以实现引入和耦合单个电子的四极矩。在这里,我们通过将超导微波谐振器连接到三个点的中间来显示该概念的实验实现,这样偶极耦合就可以忽略不计。我们证明了与电子四极矩的强耦合,并确定我们系统的相干性受到短程电荷噪声的限制。我们的实验能够在固态环境中构造和检测单个电子的复杂电子态,而对于自由电子而言,固态环境并不存在。

更新日期:2020-05-11
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