Laboratoire Pierre Aigrain, Ecole Normale Supérieure-PSL Research University, CNRS, Université Pierre et Marie Curie-Sorbonne Universités, Université Paris Diderot-Sorbonne Paris Cité, 24 Rue Lhomond, 75231 Paris Cedex 05, France.
Science. 2015 May 15;348(6236):776-9. doi: 10.1126/science.1259345.
Electromagnetic modes are instrumental in building quantum machines. In this experiment, we introduce a method to manipulate these modes by effectively controlling their phase space. Preventing access to a single energy level, corresponding to a number of photons N, confined the dynamics of the field to levels 0 to N - 1. Under a resonant drive, the level occupation was found to oscillate in time, similarly to an N-level system. Performing a direct Wigner tomography of the field revealed its nonclassical features, including a Schrödinger cat-like state at half period in the evolution. This fine control of the field in its phase space may enable applications in quantum information and metrology.
电磁模式在构建量子机器方面发挥了重要作用。在这个实验中，我们引入了一种通过有效控制其相空间来操纵这些模式的方法。通过阻止对单个能级（对应于一定数量的光子 N）的访问，将场的动力学限制在 0 到 N-1 级。在共振驱动下，发现能级占据随时间呈振荡变化，类似于 N 能级系统。对场进行直接威格纳断层扫描揭示了其非经典特征，包括在演化的半周期内呈现出薛定谔猫态。这种对场相空间的精细控制可能会在量子信息和计量学等领域得到应用。
