arXiv 1707.069522017-07-21quant-phcond-mat.other

介质镜前运动粒子的几何相位修正

Geometric phase corrections on a moving particle in front of a dielectric mirror

Fernando C. Lombardo, Paula I. Villar

备注：: Accepted for publication in EPL (Europhysics Letters)
DOI：: 10.1209/0295-5075/118/50003

摘要：

我们考虑一个原子（由一个两能级系统表示）在前面的介质板，并研究如何痕迹的耗散和退相干（两种效应引起的真空场波动）可以发现在修正的酉几何相位积累的原子。我们认为粒子遵循一个经典的，宏观固定的轨迹和整合的真空场和微观自由度的板和粒子，以计算摩擦效应。我们用解析和数值方法计算了在量子真空场和介质镜存在下运动量子比特的非幺正几何相位。我们发现，由于量子摩擦效应的修正幺正几何相位的速度依赖。我们还表明，在这种情况下，退相干效应可以，在原则上，进行控制，以执行测量的几何相位使用标准程序的拉姆齐样干涉。

英文摘要：

We consider an atom (represented by a two-level system) moving in front of a dielectric plate, and study how traces of dissipation and decoherence (both effects induced by vacuum field fluctuations) can be found in the corrections to the unitary geometric phase accumulated by the atom. We consider the particle to follow a classical, macroscopically-fixed trajectory and integrate over the vacuum field and the microscopic degrees of freedom of both the plate and the particle in order to calculate friction effects. We compute analytically and numerically the non-unitary geometric phase for the moving qubit under the presence of the quantum vacuum field and the dielectric mirror. We find a velocity dependence in the correction to the unitary geometric phase due to quantum frictional effects. We also show in which cases decoherence effects could, in principle, be controlled in order to perform a measurement of the geometric phase using standard procedures as Ramsey-like interferometry.

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英文摘要：

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