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Inherent spin angular momentum (SAM) and orbital angular momentum (OAM) whichmanifest as polarization and spatial degrees of freedom (DOF) of photons, holda promise of large capability for applications in classical and quantuminformation processing. To enable these photonic spin and orbital dynamicproperties strongly coupled with each other, Poincar\'{e} states have beenproposed and offer advantages in data multiplexing, information encryption,precision metrology, and quantum memory. However, since the transverse size ofLaguerre Gaussian beams strongly depends on their topological charge numbers$\left| l \right|$, it is difficult to store asymmetric Poincar\'{e} states dueto the significantly different light-matter interaction for distinct spatialmodes. Here, we experimentally realize the storage of perfect Poincar\'{e}states with arbitrary OAM quanta using the perfect optical vortex, in which 121arbitrarily-selected perfect Poincar\'{e} states have been stored with highfidelity. The reported work has great prospects in optical communication andquantum networks for dramatically increased encoding flexibility ofinformation.

Optical Memory for Arbitrary Perfect Poincar\'e States in an Atomic Ensemble