{"ID":2844904,"CreatedAt":"2026-06-01T04:54:23.091178241Z","UpdatedAt":"2026-06-01T04:54:23.091178241Z","DeletedAt":null,"paper_url":"https://arxiv.org/abs/2511.05173","arxiv_id":"2511.05173","title":"Performance Analysis of One- and Two-way DV-QKD with MIMO FSO Communication Systems","abstract":"This paper considers a multiple-input multiple-output (MIMO) wireless system wherein two legitimate users attempt to exchange secret keys over free-space optical (FSO) channels. Novel frameworks for the use of the one- and two-way discrete-variable quantum key distribution (DV-QKD) protocols, employing weak coherent pulses and decoy states, are presented. Focusing on the case where a photon-number-splitting attack is adopted by the eavesdropper and the legitimate multi-antenna receiver using threshold detection for the key extraction, novel expressions for the secret key rate and quantum bit error rate for both one- and two-way protocols are derived. The performance gain with larger MIMO configurations and the tradeoff between the performances with the one- and the two-way protocols with respect to the transmission distance of the legitimate FSO link are numerically assessed.","short_abstract":"This paper considers a multiple-input multiple-output (MIMO) wireless system wherein two legitimate users attempt to exchange secret keys over free-space optical (FSO) channels. Novel frameworks for the use of the one- and two-way discrete-variable quantum key distribution (DV-QKD) protocols, employing weak coherent pu...","url_abs":"https://arxiv.org/abs/2511.05173","url_pdf":"https://arxiv.org/pdf/2511.05173v1","authors":"[\"Sushil Kumar\",\"Soumya P. Dash\",\"George C. Alexandropoulos\"]","published":"2025-11-07T11:42:25Z","proceeding":"quant-ph","tasks":"[\"quant-ph\",\"eess.SP\"]","methods":"[]","has_code":false}