Manipulation of Non-classical Atomic Spin States

Understand

We report successful manipulation of non-classical atomic spin states.

• We generate squeezed spin states by a spin quantum nondemolition measurement, and apply an off-resonant circularly-polarized light pulse to the atoms.
• By changing the pulse duration, we have clearly observed a rotation of 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.