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We report the experimental demonstration of a transmission scheme of photonicqubits over unstabilized optical fibers, which has the plug-and-play feature aswell as the ability to transmit any state of a qubit, regardless of whether itis known, unknown, or entangled to other systems. A high fidelity to thenoiseless quantum channel was achieved by adding an ancilla photon after thesignal photon within the correlation time of the fiber noise and by performingquantum parity checking. Simplicity, maintenance-free feature and robustnessagainst path-length mismatches among the nodes make our scheme suitable formulti-user quantum communication networks.Comment: 8 pages, 4 figures; published in New J. Phys. and selected in IOP  Selec

Experimental ancilla-assisted qubit transmission against correlated noise using quantum parity checking