Figure 3: Quantum entanglement between the memory cells and the signal photon. | Nature Communications

Figure 3: Quantum entanglement between the memory cells and the signal photon.

From: Experimental realization of a multiplexed quantum memory with 225 individually accessible memory cells

Figure 3

(a) The measured entanglement fidelity between the chosen pairs of memory cells and the signal photon. The fidelity is calculated from the experimental density matrix reconstructed through quantum state tomography33. The error bars correspond to one s.d. We determine the error bars by assuming a Poissonian distribution for the photon counting statistics and propagate the error from the measured quantity to the target property (fidelity here) through numerical Monte Carlo simulation. The delay between the read and the write pulses is 500 ns. The positions of the chosen pairs of cells in the 2D memory array is shown in the lower part of the figure. (b) The reconstructed density matrix elements for the pair 3 of the atomic cells with the signal photon. The hollow caps denote the corresponding matrix elements for the ideal maximally entangled state.

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