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Faithful quantum entanglement purification and concentration using heralded high-fidelity parity-check detectors based on quantum-dot-microcavity systems

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Abstract

Entanglement purification and concentration are effective means to deal with the influence of noise on the coherence of entangled quantum systems, which enable us to carry out secure and efficient quantum communications. However, the reliability of parity check in parity-check-based entanglement purification and concentration schemes will inevitably affect the performance of the schemes. In this paper, we propose faithful entanglement purification and concentration schemes for polarization-entangled photon pairs, using heralded high-fidelity parity-check detectors (PCDs) constructed by double-sided quantum-dot-microcavity (QD-microcavity) systems and linear-optical elements. The PCD is based on the general interaction rule between the input photon and the QD-microcavity system, without the requirement of the system to strictly satisfy the specifically ideal conditions for giant circular birefringence, which makes it more realizable in practice. Moreover, the PCD can work in a failure-heralded and fidelity-robust fashion, so it can make a correct judgement on the parity mode of a two-photon system and has no destruction on the entangled state. Our schemes can therefore realize faithful entanglement purification and concentration by utilizing the PCD, without reducing the fidelity and entanglement degree of the obtained entangled-state ensemble. These features make our schemes more feasible and useful in quantum repeaters and quantum networks.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (NSFC) under Grant Nos. 61701035 and 61671085 and by Fund of State Key Laboratory of Information Photonics and Optical Communications (Beijing University of Posts and Telecommunications), P. R. China.

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Authors and Affiliations

  1. School of science, Beijing University of Posts and Telecommunications, Beijing, 100876, China

    Pan-Pan Yin

  2. School of Electronic Engineering, State Key Laboratory of Information Photonics and Optical Communications, Beijing Key Laboratory of Space-Ground Interconnection and Convergence, Beijing University of Posts and Telecommunications, Beijing, 100876, China

    Cong Cao & Ling Fan

  3. School of Science, School of Information and Communication Engineering, Beijing University of Posts and Telecommunications, Beijing, 100876, China

    Yu-Hong Han

  4. School of Science, State Key Laboratory of Information Photonics and Optical Communications, Beijing Key Laboratory of Space-Ground Interconnection and Convergence, Beijing University of Posts and Telecommunications, Beijing, 100876, China

    Ru Zhang

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  1. Pan-Pan Yin
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Yin, PP., Cao, C., Han, YH. et al. Faithful quantum entanglement purification and concentration using heralded high-fidelity parity-check detectors based on quantum-dot-microcavity systems. Quantum Inf Process 21, 17 (2022). https://doi.org/10.1007/s11128-021-03371-y

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