Department of Physics, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan.
Phys Rev Lett. 2010 Jan 8;104(1):013602. doi: 10.1103/PhysRevLett.104.013602. Epub 2010 Jan 5.
We report successful manipulation of nonclassical atomic spin states. We apply an off-resonant noncircularly-polarized light pulse to a measurement-induced squeezed spin state of a cold atomic ensemble. By changing the pulse duration, we clearly observe a rotation of the anisotropic quantum-noise distribution in good contrast with the case of manipulation of a coherent spin state where the quantum-noise distribution is always isotropic. This is an important step for quantum state tomography, quantum swapping, and precision spectroscopic measurement.
我们成功地操控了非经典原子自旋态。我们将一个非共振的非圆偏振光脉冲应用于冷原子系综的测量诱导压缩自旋态。通过改变脉冲持续时间，我们清楚地观察到各向异性量子噪声分布的旋转，与操控相干自旋态的情况形成鲜明对比，在后者中，量子噪声分布始终是各向同性的。这是量子态层析成像、量子交换和精密光谱测量的重要步骤。
