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In prepare\u2010and\u2010measure QKD protocols, the states must be indistinguishable to prevent information leakage to an eavesdropper performing a side\u2010channel attack. Here, we measure the indistinguishability of quantum states in a prepare\u2010and\u2010measure three\u2010state BB84 polarisation\u2010based decoy state protocol using resonant\u2010cavity light\u2010emitting diodes (RC\u2010LEDs) as the source in the transmitter. We make the spatial, spectral and temporal DOF of the generated quantum states nearly indistinguishable using a spatial filter single\u2010mode fibre, a narrow\u2010band spectral filter and adjustable timing of the electrical pulses driving the RC\u2010LEDs, respectively. The sources have fully indistinguishable transverse spatial modes. The measured fractional mutual information between an assumed eavesdropper and the legitimate receiver is  due to the spectral distinguishability and  for the temporal distinguishability. The source is integrated into a full QKD system operating in a laboratory environment, where we achieve a secure key rate of 41.5 kbits\/s with an average quantum bit error rate of 2.9%. The low system size, weight and power make it suitable for mobile platforms such as uncrewed aerial vehicles (drones) or automobiles.<\/jats:p>","DOI":"10.1049\/qtc2.70025","type":"journal-article","created":{"date-parts":[[2025,11,19]],"date-time":"2025-11-19T04:21:33Z","timestamp":1763526093000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["A Quantum Key Distribution System for Mobile Platforms With Highly Indistinguishable States"],"prefix":"10.1049","volume":"6","author":[{"given":"Daniel Sanchez","family":"Rosales","sequence":"first","affiliation":[{"name":"Department of Physics The Ohio State University  Columbus Ohio USA"}]},{"given":"Roderick D.","family":"Cochran","sequence":"additional","affiliation":[{"name":"Department of Physics The Ohio State University  Columbus Ohio USA"}]},{"given":"Samantha D.","family":"Isaac","sequence":"additional","affiliation":[{"name":"Department of Physics University of Illinois Urbana\u2010Champaign  Champaign Illinois USA"}]},{"given":"Paul G.","family":"Kwiat","sequence":"additional","affiliation":[{"name":"Department of Physics University of Illinois Urbana\u2010Champaign  Champaign Illinois USA"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4473-217X","authenticated-orcid":false,"given":"Daniel J.","family":"Gauthier","sequence":"additional","affiliation":[{"name":"Department of Physics The Ohio State University  Columbus Ohio USA"}]}],"member":"265","published-online":{"date-parts":[[2025,11,18]]},"reference":[{"key":"e_1_2_11_2_1","unstructured":"C.Gidney preprint arXiv:2505.15917 (2025)."},{"key":"e_1_2_11_3_1","doi-asserted-by":"publisher","DOI":"10.1038\/nphoton.2007.22"},{"key":"e_1_2_11_4_1","doi-asserted-by":"publisher","DOI":"10.1140\/epjqt\/s40507\u2010025\u201000350\u20105"},{"key":"e_1_2_11_5_1","doi-asserted-by":"publisher","DOI":"10.1109\/comst.2022.3144219"},{"key":"e_1_2_11_6_1","unstructured":"Toshiba \u201cQuantum Key Distribution \u201d (2024) accessed January 06 2024 https:\/\/www.toshiba.eu\/quantum\/products\/quantum\u2010key\u2010distribution."},{"key":"e_1_2_11_7_1","unstructured":"ID Quantique \u201cQuantum Key Distribution \u201d (2024) accessed January 06 2024 https:\/\/www.idquantique.com\/quantum\u2010safe\u2010security\/products\/#quantum_key_distribution."},{"key":"e_1_2_11_8_1","unstructured":"Quantum CTek \u201cQuantum Communication Network \u201d (2024) accessed January 06 2024 http:\/\/www.quantum\u2010info.com\/English\/product\/."},{"key":"e_1_2_11_9_1","doi-asserted-by":"publisher","DOI":"10.1038\/nature23655"},{"key":"e_1_2_11_10_1","doi-asserted-by":"publisher","DOI":"10.1103\/physrevlett.130.210801"},{"key":"e_1_2_11_11_1","doi-asserted-by":"publisher","DOI":"10.1103\/physrevlett.121.190502"},{"key":"e_1_2_11_12_1","doi-asserted-by":"publisher","DOI":"10.1088\/2058\u20109565\/aa701f"},{"key":"e_1_2_11_13_1","doi-asserted-by":"publisher","DOI":"10.1140\/epjqt\/s40507\u2010021\u201000101\u20102"},{"key":"e_1_2_11_14_1","doi-asserted-by":"publisher","DOI":"10.1364\/oe.25.006784"},{"key":"e_1_2_11_15_1","doi-asserted-by":"publisher","DOI":"10.1103\/physrevapplied.18.024067"},{"key":"e_1_2_11_16_1","doi-asserted-by":"publisher","DOI":"10.1364\/prj.7.001169"},{"key":"e_1_2_11_17_1","unstructured":"U.S. Army Unmanned Aircraft Systems Center of Excellence U.S. Army Unmanned Aircraft Systems Roadmap 2010\u20132035: Eyes of the Army(2010) https:\/\/books.google.com\/books?id=hb9NnQAACAAJ."},{"key":"e_1_2_11_18_1","doi-asserted-by":"publisher","DOI":"10.1093\/nsr\/nwz227"},{"key":"e_1_2_11_19_1","volume-title":"CLEO 2023, Technical Digest Series (Optica Publishing Group, 2023)","author":"Tian X.\u2010H.","year":"2023"},{"key":"e_1_2_11_20_1","unstructured":"A.Conrad R.Cochran D.Sanchez\u2010Rosales et\u00a0al. preprint arXiv:2505.17587 (2025)."},{"key":"e_1_2_11_21_1","doi-asserted-by":"crossref","unstructured":"D. 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