Polarization of a charge qubit strongly coupled to a voltage-driven quantum point contact

被引：18

作者：

Snyman, I.

Nazarov, Y. V.

机构：

[1] Leiden Univ, Inst Lorentz, NL-2300 RA Leiden, Netherlands

[2] Delft Univ Technol, Kavli Inst Nanosci, NL-2628 CJ Delft, Netherlands

来源：

PHYSICAL REVIEW LETTERS | 2007年 / 99卷 / 09期

关键词：

D O I：

10.1103/PhysRevLett.99.096802

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We study a charge qubit with level splitting epsilon, coupled to a quantum point contact driven by voltage V. In the limit of weak coupling, the qubit polarization shows cusps at epsilon=+/- eV. We show that, for stronger couplings, prominent peculiarities occur at fractions epsilon=+/- eV/2. Further increase of the coupling leads to a polarization corresponding to a pseudo Boltzmann distribution with an effective temperature similar to eV.

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页数：4

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