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Abstract: We present an economical setup for faithful entanglement sharing againstcollective noise. It is composed of polarizing beam splitters, half waveplates, polarization independent wavelength division multiplexers, andfrequency shifters. An arbitrary qubit error on the polarization state of eachphoton in a multi-photon system caused by the noisy channel can be rejected,without resorting to additional qubits, fast polarization modulators, andnondestructive quantum nondemolition detectors. Its success probability is inprinciple 100%, which is independent of the noise parameters, and it can beapplied directly in any one-way quantum communication protocol based onentanglement.



Autor: Hui-Chong Niu, Bao-Cang Ren, Tie-Jun Wang, Ming Hua, Fu-Guo Deng

Fuente: https://arxiv.org/







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