Electromagnetically induced transparency quantum memory for non-classical states of light

Figures & data

Figure 1. The vee-type ($\mathrm{V}$), ladder and lambda ($\mathrm{\Lambda }$) structures in three-level system.

Figure 2. The general EIT system.

Figure 3. Propagation of a dark-state polariton. (a) The mixing angle is rotated from 0 to $\pi /2$. (b) The coherent amplitude of the polariton, light and matter components are plotted. (c) (d) the quantum state is transferred between light and matter, respectively. Reprinted with permission [32].

Figure 4. The iteration signal mode by a certain control mode and the efficiency with different pulse shape. Reprinted with permission [35].

Figure 5. The experiment setup for QM in cold atoms. The energy level shows in the bottom left. Reprinted with permission [88].

Figure 6. The signal mode energy and the retrieved images varies with memory time. Reprinted with permission [94].

Figure 7. Experimental setup and energy level scheme of the single-photon QM. (a) Schematic of the experimental optical setup. (b) The memory operation timing shows the MOT sequence and the optimized control laser intensity time-varying profile in each experimental cycle. (c) The atomic energy level scheme of the QM based on EIT. Reprinted with permission [39].

Figure 8. Experimental setup. the inset shows the atomic level configuration. Reprinted with permission [57].

Figure 9. (a) Reversible mapping. Illustration of the mapping of an entangled state of light into and out of a QM. (b) Entangled a pair of photons. (c) Quantum interface for reversible mapping. (d)Entanglement verification system. Reprinted with permission [59]

Figure 10. Schematic diagram. Experimental setup. It includes three parts, Part I is the generation system of tripartite optical entanglement; Part II is the transportation of tripartite entanglement to three distant atomic ensembles; Part III is the entanglement verification system. Reprinted with permission [63].

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