Quantum Optics of Spin Waves through ac Stark Modulation
Michal P. Parniak, Mateusz Mazelanik, Adam Leszczyński, Michał Lipka, Michał Dąbrowski, Wojciech Wasilewski · Physical Review Letters · 2019
We bring the set of linear quantum operations, important for many fundamental studies in photonic systems, to the material domain of collective excitations known as spin waves. Using the ac Stark effect we realize quantum operations on single excitations and demonstrate a spin-wave analog of the Hong-Ou-Mandel effect, realized via a beam splitter implemented in the spin-wave domain. Our scheme equips atomic-ensemble-based quantum repeaters with quantum information processing capability and can be readily brought to other physical systems, such as doped crystals or room-temperature atomic ensembles.