Experimental setup of cold ⁸⁷Rb atoms prepared in a magneto-optical trap for generating and manipulating spin waves through ac Stark modulation. W (R) represents the write (read) laser, w (r) the writeout (readout) photon, and B the magnetic field.

From the article:

Quantum Optics of Spin Waves through ac Stark Modulation
Michał Parniak, Mateusz Mazelanik, Adam Leszczyński, Michał Lipka, Michał Dąbrowski, and Wojciech Wasilewski
Phys. Rev. Lett. 122, 063604 (2019)

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