Fig. 5 | npj Quantum Information

Fig. 5

From: Nondestructive detector for exchange symmetry of photonic qubits

Fig. 5

Experimental scheme of controlled exchange interaction device. Red line denotes photons path. HWP - half-wave plate (the ring variant is used in cnot and swap blocks), QWP - quarter-wave plate, BD - calcite beam displacer, PPBS - partially polarizing beam splitter, PBS - polarizing beam splitter, APD - collimator and single-mode optical fiber connected to avalanche photodiode. Inset shows the symbolic circuit diagram

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