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We have assembled a prototype for routing quantum states (qubits). This device allows single-photon polarization-encoded qubits to be routed coherently into two spatial output modes depending on the state of two identical control qubits. The polarization qubit state of the routed photon is maintained during the routing operation. The efficiency of the routing can be increased up to 25% making it the most efficient linear-optical quantum router developed to this date.
Description
Conceptual scheme of a quantum router. Signal qubit is coherently routed into a superposition of output spatial modes with amplitudes given by the state of the control qubit.