Fig. 4 | Nature Communications

Fig. 4

From: High-fidelity entanglement between a trapped ion and a telecom photon via quantum frequency conversion

Fig. 4

Quantum-state tomography of the ion–telecom-photon entangled states. Real and imaginary parts of the density matrices for: a the converted “bare” ion–photon entangled state still revealing the asymmetry in the diagonal elements (red bars) due to the asymmetric Clebsch–Gordan coefficients, b the converted ion–photon entangled state projected onto a Bell state by introducing polarization-dependent losses

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