Harmonic Fine Tuning and Triaxial Spatial Anisotropy of Dressed Atomic Spins
Authors: Bevilacqua G., Biancalana V., Vigilante A., Zanon-Willette T., Arimondo E.
Autors Affiliation: Univ Siena, Dept Informat Engn & Math DIISM, Via Roma 56, I-53100 Siena, Italy; UCL, Dept Phys & Astron, Gower St, London WC1E 6BT, England; Univ PSL, Sorbonne Univ, Observ Paris, CNRS,LERMA, F-75005 Paris, France; Univ Pisa, Dept Fis E. Fermi, Largo B Pontecorvo 3, I-56127 Pisa, Italy; INO CNR, Via G Moruzzi 1, I-56124 Pisa, Italy
Abstract: The addition of a weak oscillating field modifying strongly dressed spins enhances and enriches the system quantum dynamics. Through low-order harmonic mixing, the bichromatic driving generates additional rectified static field acting on the spin system. The secondary field allows for a fine tuning of the atomic response and produces effects not accessible with a single dressing field, such as a spatial triaxial anisotropy of the spin coupling constants and acceleration of the spin dynamics. This tuning-dressed configuration introduces an extra handle for the system full engineering in quantum control applications. Tuning amplitude, harmonic content, spatial orientation, and phase relation are control parameters. A theoretical analysis, based on perturbative approach, is experimentally tested by applying a bichromatic radiofrequency field to an optically pumped Cs atomic vapour. The theoretical predictions are precisely confirmed by measurements performed with tuning frequencies up to the third harmonic.
Journal/Review: PHYSICAL REVIEW LETTERS
Volume: 125 (9) Pages from: 093203-1 to: 093203-6