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Entanglement concentration of W state using linear optics with a higher success probability

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Abstract

Entanglement concentration protocol (ECP), as a practical technique, can be use to preclude degraded fidelity and improve security in long-haul quantum communication. We propose an efficient ECP for less-entangled unknown W states with simple linear-optics elements and effective single-photon detectors, resorting to time-delay degree of freedom. Moreover, in contrast to previous ECPs proposed for W states, the scheme has the advantages over requiring less quantum resource without auxiliary photons, comparatively simplified circuits, involving neither post-selection techniques nor photon-number-resolving detectors to distinguish the parity outcome, and being provided with a higher success probability by reusing the less-entangled states.

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  1. Science and Technology on Electronic Test and Measurement Laboratory, North University of China, Taiyuan, 030051, China

    Fang-Fang Du, Ming Ma, Xue-Mei Ren & Gang Fan

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  1. Fang-Fang Du
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Du, FF., Ma, M., Ren, XM. et al. Entanglement concentration of W state using linear optics with a higher success probability. Quantum Inf Process 23, 134 (2024). https://doi.org/10.1007/s11128-024-04334-9

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