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Figure 7 | EPJ Quantum Technology

Figure 7

From: Polarization compensation method based on the wave plate group in phase mismatch for free-space quantum key distribution

Figure 7

Experimental results of our compensation method for a degradation simulation system based on the BB84 protocol. The polarization angle of H (ex H) and the deviation angle of V, +, - from H after the compensation experiment and the polarization angle of H by the theoretical calculation (ex H), when the (a-1) phase is considered as matched at 850 nm (850 mt), (a-2) phase mismatch at 850 nm (850 mis), and (a-3) phase mismatch at 1550 nm (1550 mis); 850 mt experiment (b-1) PER, (b-2) distribution of H, V, +, and − states on the Poincaré sphere without basis vector correction, and (b-3) distribution of H, V, +, and − states on the Poincaré sphere with basis vector correction; 850 mis experiment (c-1) PER, (c-2) distribution of H, V, +, and − states on the Poincaré sphere without basis vector correction, and (c-3) distribution of H, V, +, and − states on the Poincaré sphere with basis vector correction; 150 mis experiment (c-1) PER, (c-2) distribution of H, V, +, and − states on the Poincaré sphere without basis vector correction, and (c-3) distribution of H, V, +, and − states on the Poincaré sphere with basis vector correction

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