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

Abstract

We report the experimental demonstration of a transmission scheme of photonic qubits over unstabilized optical fibers, which has the plug-and-play feature as well as the ability to transmit any state of a qubit, regardless of whether it is known, unknown, or entangled to other systems. A high fidelity to the noiseless quantum channel was achieved by adding an ancilla photon after the signal photon within the correlation time of the fiber noise and by performing quantum parity checking. Simplicity, maintenance-free feature and robustness against path-length mismatches among the nodes make our scheme suitable for multi-user quantum communication networks.

8 pages, 4 figures; published in New J. Phys. and selected in IOP Select

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• Efficient decoherence-free entanglement distribution over lossy quantum channels
• Efficient faithful qubit transmission with frequency degree of freedom
• Robustness of quantum communication based on a decoherence-free subspace using a counter-propagating weak coherent light pulse
• Link-space formalism for network analysis
• Self-error-rejecting quantum state transmission of entangled photons for faithful quantum communication without calibrate reference frames
• Extracting an entangled photon pair from collectively decohered pairs at a telecommunication wavelength
• Experimental demonstration of robust entanglement distribution over reciprocal noisy channels assisted by a counter-propagating classical reference light
• Memory effects in quantum information transmission across a Hamiltonian dephasing channel