Ozeri R, Langer C, Jost J D, DeMarco B, Ben-Kish A, Blakestad B R, Britton J, Chiaverini J, Itano W M, Hume D B, Leibfried D, Rosenband T, Schmidt P O, Wineland D J
NIST Boulder, Time and Frequency Division, Boulder, CO 80305, USA.
Phys Rev Lett. 2005 Jul 15;95(3):030403. doi: 10.1103/PhysRevLett.95.030403. Epub 2005 Jul 14.
The coherence of a hyperfine-state superposition of a trapped 9Be+ ion in the presence of off-resonant light is studied experimentally. It is shown that Rayleigh elastic scattering of photons that does not change state populations also does not affect coherence. We observe coherence times that exceed the average scattering time of 19 photons which is determined from measured Stark shifts. This result implies that, with sufficient control over its parameters, laser light can be used to manipulate hyperfine-state superpositions with very little decoherence.
对存在非共振光时捕获的(^{9}Be^{+})离子超精细态叠加的相干性进行了实验研究。结果表明，不改变态布居数的光子瑞利弹性散射也不会影响相干性。我们观察到的相干时间超过了由测量的斯塔克位移确定的19个光子的平均散射时间。这一结果意味着，通过对其参数进行充分控制，激光可用于操纵超精细态叠加，且退相干极小。
