2020/05/31 by Vojtěch Trávníček, Karol Bartkiewicz, Antonín Černoch +1
Computer Science · Physics and Astronomy · #Amplitude damping channel #Imperfect #Key (lock) #Protocol (science) #Quantum #Quantum Computing Algorithms and Architecture #Quantum Information and Cryptography #Quantum Mechanics and Applications #Quantum entanglement #Quantum metrology #Quantum sensor #Transmission (telecommunications) #physics.optics #quant-ph
paper · pdf · doi:10.1103/physrevapplied.14.064071
published as Phys. Rev. Applied 14, 064071 (2020) · 6 pages, 4 figures
arxiv created 2020/08/18 · openalex created_date 2020/08/24 · openalex publication_date 2020/12/24 · arxiv updated 2021/01/04 · openalex updated_date 2026/08/05
This paper reports on the experimental diagnostics of an entanglement-swapping protocol by means of collective entanglement witness. Our approach is suitable to detect disturbances occurring in the preparation of quantum states, quantum-communication channels, and imperfect Bell-state projections. More specifically, we demonstrate that our method can distinguish disturbances such as depolarization, phase damping, amplitude damping, and imperfect Bell-state measurement by observing four probabilities and estimating collective entanglement witness. Since entanglement swapping is a key procedure for quantum repeaters, quantum relays, device-independent quantum communications, and entanglement-assisted error correction, this can aid in faster and practical resolutions of quality of transmission related problems as our approach requires fewer measurements than other means of diagnostics.