Overview of the Experiment for 4 Entangled Quantum Memories (IMAGE)
Caption
Writing laser pulses are switched on by the intensity modulator (IM_write) and generate correlated light scattering from four collections of atoms (atomic ensembles which serve as quantum memories). Detection of a single photon at Dh for the light scattered from the atoms creates the entangled state rho^(A)_w with one spin excitation shared collectively among the ensembles (as illustrated at the top of the figure). At later times, the intensity modulator (IM_read) switches on read laser pulses that read out the quantum information stored in the atoms, thereby creating four entangled beams of light in the state rho^(gamma)_w illustrated in the lower right corner of the figure. The inset is a fluorescence image of the laser-cooled atomic ensembles a, b, c and d that become entangled.
Credit
Akihisa Goban/Nature
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