{"id":"https://openalex.org/W6964959211","doi":"https://doi.org/10.26083/tuprints-00026505","title":"A Quantum Hub for Star-Shaped Quantum Key Distribution Networks","display_name":"A Quantum Hub for Star-Shaped Quantum Key Distribution Networks","publication_year":2024,"publication_date":"2024-01-01","ids":{"openalex":"https://openalex.org/W6964959211","doi":"https://doi.org/10.26083/tuprints-00026505"},"language":"en","primary_location":{"id":"pmh:oai:tubiblio.ulb.tu-darmstadt.de:142781","is_oa":false,"landing_page_url":null,"pdf_url":null,"source":{"id":"https://openalex.org/S4377196390","display_name":"TUbilio (Technical University of Darmstadt)","issn_l":null,"issn":null,"is_oa":false,"is_in_doaj":false,"is_core":false,"host_organization":"https://openalex.org/I31512782","host_organization_name":"Technische Universit\u00e4t Darmstadt","host_organization_lineage":["https://openalex.org/I31512782"],"host_organization_lineage_names":[],"type":"repository"},"license":null,"license_id":null,"version":"acceptedVersion","is_accepted":true,"is_published":false,"raw_source_name":"","raw_type":"Dissertation"},"type":"dissertation","indexed_in":["datacite"],"open_access":{"is_oa":true,"oa_status":"green","oa_url":"https://tuprints.ulb.tu-darmstadt.de/26505/1/Fitzke_2024_PhD_Thesis_Quantum_Hub.pdf","any_repository_has_fulltext":true},"authorships":[{"author_position":"first","author":{"id":null,"display_name":"Fitzke, Erik","orcid":"https://orcid.org/0000-0002-1046-6176"},"institutions":[],"countries":[],"is_corresponding":true,"raw_author_name":"Fitzke, Erik","raw_affiliation_strings":[],"raw_orcid":"https://orcid.org/0000-0002-1046-6176","affiliations":[]}],"institutions":[],"countries_distinct_count":0,"institutions_distinct_count":1,"corresponding_author_ids":[],"corresponding_institution_ids":[],"apc_list":null,"apc_paid":null,"fwci":null,"has_fulltext":false,"cited_by_count":0,"citation_normalized_percentile":null,"cited_by_percentile_year":null,"biblio":{"volume":null,"issue":null,"first_page":null,"last_page":null},"is_retracted":false,"is_paratext":false,"is_xpac":true,"primary_topic":{"id":"https://openalex.org/T12713","display_name":"Forest Ecology and Biodiversity Studies","score":0.18770000338554382,"subfield":{"id":"https://openalex.org/subfields/1109","display_name":"Insect Science"},"field":{"id":"https://openalex.org/fields/11","display_name":"Agricultural and Biological Sciences"},"domain":{"id":"https://openalex.org/domains/1","display_name":"Life Sciences"}},"topics":[{"id":"https://openalex.org/T12713","display_name":"Forest Ecology and Biodiversity Studies","score":0.18770000338554382,"subfield":{"id":"https://openalex.org/subfields/1109","display_name":"Insect Science"},"field":{"id":"https://openalex.org/fields/11","display_name":"Agricultural and Biological Sciences"},"domain":{"id":"https://openalex.org/domains/1","display_name":"Life Sciences"}},{"id":"https://openalex.org/T11753","display_name":"Forest Management and Policy","score":0.1395999938249588,"subfield":{"id":"https://openalex.org/subfields/2306","display_name":"Global and Planetary Change"},"field":{"id":"https://openalex.org/fields/23","display_name":"Environmental Science"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},{"id":"https://openalex.org/T11164","display_name":"Remote Sensing and LiDAR Applications","score":0.10660000145435333,"subfield":{"id":"https://openalex.org/subfields/2305","display_name":"Environmental Engineering"},"field":{"id":"https://openalex.org/fields/23","display_name":"Environmental Science"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}}],"keywords":[{"id":"https://openalex.org/keywords/quantum-key-distribution","display_name":"Quantum key distribution","score":0.9359999895095825},{"id":"https://openalex.org/keywords/quantum-cryptography","display_name":"Quantum cryptography","score":0.6274999976158142},{"id":"https://openalex.org/keywords/quantum-network","display_name":"Quantum network","score":0.5688999891281128},{"id":"https://openalex.org/keywords/key","display_name":"Key (lock)","score":0.5052000284194946},{"id":"https://openalex.org/keywords/flexibility","display_name":"Flexibility (engineering)","score":0.49320000410079956},{"id":"https://openalex.org/keywords/cryptography","display_name":"Cryptography","score":0.4778999984264374},{"id":"https://openalex.org/keywords/reliability","display_name":"Reliability (semiconductor)","score":0.46950000524520874},{"id":"https://openalex.org/keywords/encryption","display_name":"Encryption","score":0.45410001277923584},{"id":"https://openalex.org/keywords/quantum-computer","display_name":"Quantum computer","score":0.44940000772476196}],"concepts":[{"id":"https://openalex.org/C95466800","wikidata":"https://www.wikidata.org/wiki/Q1027298","display_name":"Quantum key distribution","level":3,"score":0.9359999895095825},{"id":"https://openalex.org/C41008148","wikidata":"https://www.wikidata.org/wiki/Q21198","display_name":"Computer science","level":0,"score":0.667900025844574},{"id":"https://openalex.org/C144901912","wikidata":"https://www.wikidata.org/wiki/Q471906","display_name":"Quantum cryptography","level":4,"score":0.6274999976158142},{"id":"https://openalex.org/C186468114","wikidata":"https://www.wikidata.org/wiki/Q836478","display_name":"Quantum network","level":4,"score":0.5688999891281128},{"id":"https://openalex.org/C26517878","wikidata":"https://www.wikidata.org/wiki/Q228039","display_name":"Key (lock)","level":2,"score":0.5052000284194946},{"id":"https://openalex.org/C2780598303","wikidata":"https://www.wikidata.org/wiki/Q65921492","display_name":"Flexibility (engineering)","level":2,"score":0.49320000410079956},{"id":"https://openalex.org/C178489894","wikidata":"https://www.wikidata.org/wiki/Q8789","display_name":"Cryptography","level":2,"score":0.4778999984264374},{"id":"https://openalex.org/C43214815","wikidata":"https://www.wikidata.org/wiki/Q7310987","display_name":"Reliability (semiconductor)","level":3,"score":0.46950000524520874},{"id":"https://openalex.org/C148730421","wikidata":"https://www.wikidata.org/wiki/Q141090","display_name":"Encryption","level":2,"score":0.45410001277923584},{"id":"https://openalex.org/C58053490","wikidata":"https://www.wikidata.org/wiki/Q176555","display_name":"Quantum computer","level":3,"score":0.44940000772476196},{"id":"https://openalex.org/C99674996","wikidata":"https://www.wikidata.org/wiki/Q1414155","display_name":"Key exchange","level":4,"score":0.41990000009536743},{"id":"https://openalex.org/C9652623","wikidata":"https://www.wikidata.org/wiki/Q190109","display_name":"Field (mathematics)","level":2,"score":0.4146000146865845},{"id":"https://openalex.org/C84114770","wikidata":"https://www.wikidata.org/wiki/Q46344","display_name":"Quantum","level":2,"score":0.4050999879837036},{"id":"https://openalex.org/C78203541","wikidata":"https://www.wikidata.org/wiki/Q2566969","display_name":"BB84","level":5,"score":0.39629998803138733},{"id":"https://openalex.org/C187486625","wikidata":"https://www.wikidata.org/wiki/Q2122176","display_name":"Quantum channel","level":4,"score":0.37950000166893005},{"id":"https://openalex.org/C160333310","wikidata":"https://www.wikidata.org/wiki/Q6398153","display_name":"Key distribution","level":4,"score":0.36640000343322754},{"id":"https://openalex.org/C2780385302","wikidata":"https://www.wikidata.org/wiki/Q367158","display_name":"Protocol (science)","level":3,"score":0.3650999963283539},{"id":"https://openalex.org/C5320026","wikidata":"https://www.wikidata.org/wiki/Q2122216","display_name":"Quantum information science","level":4,"score":0.3476000130176544},{"id":"https://openalex.org/C31258907","wikidata":"https://www.wikidata.org/wiki/Q1301371","display_name":"Computer network","level":1,"score":0.3463999927043915},{"id":"https://openalex.org/C169699857","wikidata":"https://www.wikidata.org/wiki/Q2122243","display_name":"Quantum information","level":3,"score":0.33469998836517334},{"id":"https://openalex.org/C190463098","wikidata":"https://www.wikidata.org/wiki/Q2081419","display_name":"Quantum technology","level":4,"score":0.31450000405311584},{"id":"https://openalex.org/C120314980","wikidata":"https://www.wikidata.org/wiki/Q180634","display_name":"Distributed computing","level":1,"score":0.29280000925064087},{"id":"https://openalex.org/C19275194","wikidata":"https://www.wikidata.org/wiki/Q222903","display_name":"Multiplexing","level":2,"score":0.2759000062942505},{"id":"https://openalex.org/C184720557","wikidata":"https://www.wikidata.org/wiki/Q7825049","display_name":"Topology (electrical circuits)","level":2,"score":0.27390000224113464},{"id":"https://openalex.org/C89143813","wikidata":"https://www.wikidata.org/wiki/Q17105423","display_name":"Quantum sensor","level":5,"score":0.26429998874664307},{"id":"https://openalex.org/C159631557","wikidata":"https://www.wikidata.org/wiki/Q1546066","display_name":"Networking hardware","level":2,"score":0.2542000114917755}],"mesh":[],"locations_count":3,"locations":[{"id":"pmh:oai:tubiblio.ulb.tu-darmstadt.de:142781","is_oa":false,"landing_page_url":null,"pdf_url":null,"source":{"id":"https://openalex.org/S4377196390","display_name":"TUbilio (Technical University of Darmstadt)","issn_l":null,"issn":null,"is_oa":false,"is_in_doaj":false,"is_core":false,"host_organization":"https://openalex.org/I31512782","host_organization_name":"Technische Universit\u00e4t Darmstadt","host_organization_lineage":["https://openalex.org/I31512782"],"host_organization_lineage_names":[],"type":"repository"},"license":null,"license_id":null,"version":"acceptedVersion","is_accepted":true,"is_published":false,"raw_source_name":"","raw_type":"Dissertation"},{"id":"pmh:oai:tuprints.ulb.tu-darmstadt.de:26505","is_oa":true,"landing_page_url":"https://tuprints.ulb.tu-darmstadt.de/26505/1/Fitzke_2024_PhD_Thesis_Quantum_Hub.pdf","pdf_url":null,"source":{"id":"https://openalex.org/S4306401590","display_name":"Technischen Universit\u00e4t Darmstadt","issn_l":null,"issn":null,"is_oa":false,"is_in_doaj":false,"is_core":false,"host_organization":"https://openalex.org/I31512782","host_organization_name":"Technische Universit\u00e4t Darmstadt","host_organization_lineage":["https://openalex.org/I31512782"],"host_organization_lineage_names":[],"type":"repository"},"license":"cc-by","license_id":"https://openalex.org/licenses/cc-by","version":"submittedVersion","is_accepted":false,"is_published":false,"raw_source_name":"","raw_type":"Ph.D. Thesis"},{"id":"doi:10.26083/tuprints-00026505","is_oa":true,"landing_page_url":"https://doi.org/10.26083/tuprints-00026505","pdf_url":null,"source":{"id":"https://openalex.org/S7407051655","display_name":"TUprints","issn_l":null,"issn":[],"is_oa":false,"is_in_doaj":false,"is_core":false,"host_organization":null,"host_organization_name":null,"host_organization_lineage":[],"host_organization_lineage_names":[],"type":"repository"},"license":"cc-by","license_id":"https://openalex.org/licenses/cc-by","version":null,"is_accepted":false,"is_published":null,"raw_source_name":null,"raw_type":"thesis"}],"best_oa_location":{"id":"pmh:oai:tuprints.ulb.tu-darmstadt.de:26505","is_oa":true,"landing_page_url":"https://tuprints.ulb.tu-darmstadt.de/26505/1/Fitzke_2024_PhD_Thesis_Quantum_Hub.pdf","pdf_url":null,"source":{"id":"https://openalex.org/S4306401590","display_name":"Technischen Universit\u00e4t Darmstadt","issn_l":null,"issn":null,"is_oa":false,"is_in_doaj":false,"is_core":false,"host_organization":"https://openalex.org/I31512782","host_organization_name":"Technische Universit\u00e4t Darmstadt","host_organization_lineage":["https://openalex.org/I31512782"],"host_organization_lineage_names":[],"type":"repository"},"license":"cc-by","license_id":"https://openalex.org/licenses/cc-by","version":"submittedVersion","is_accepted":false,"is_published":false,"raw_source_name":"","raw_type":"Ph.D. Thesis"},"sustainable_development_goals":[{"display_name":"Sustainable cities and communities","id":"https://metadata.un.org/sdg/11","score":0.763538658618927}],"awards":[],"funders":[],"has_content":{"pdf":false,"grobid_xml":false},"content_urls":null,"referenced_works_count":0,"referenced_works":[],"related_works":[],"abstract_inverted_index":{"Recent":[0],"advances":[1],"in":[2,147,163,240,261,356,418,489,505,577],"the":[3,55,69,84,106,109,122,135,138,141,144,176,219,227,251,269,277,294,310,330,334,347,364,372,383,419,429,432,475,482,502,506,514,530,533,537,542,559,566,587,594,609,621,634],"field":[4,165,358,369,374],"of":[5,22,51,59,64,83,112,137,143,172,204,210,290,299,309,333,346,363,376,404,415,422,435,467,474,486,491,517,532,558,561,574,579,586,597,603,620,636],"classical":[6],"computing":[7,10],"and":[8,125,161,167,201,296,344,457,498,546,549,630],"quantum":[9,52,65,195,205],"enable":[11,246,627],"new":[12,324,479],"attacks":[13],"on":[14,236,382],"today's":[15],"public-key":[16],"cryptography.":[17],"Therefore,":[18,140,250],"an":[19,452],"essential":[20],"goal":[21],"cybersecurity":[23,30],"research":[24,145],"is":[25,36,186,254,340,399,445,462,496,524,529,565,590],"to":[26,39,79,108,133,151,157,168,207,215,223,245,257,276,284,428,500,568,600,611],"develop":[27,152,169],"new,":[28],"future-proof":[29],"solutions.":[31],"Quantum":[32],"key":[33,196,248,392,527],"distribution":[34,203,393,545],"(QKD)":[35],"a":[37,76,81,153,164,189,193,231,300,315,323,338,357,361,377,441,448,510,583,601,612,617],"method":[38,325,480,512,564],"distribute":[40],"symmetric":[41],"digital":[42],"cryptographic":[43],"keys":[44,206],"between":[45,92,218,409],"two":[46,93,410],"users":[47,71,94,102,211,311,423],"by":[48,75,321,554,592],"using":[49,322],"principles":[50,63],"physics,":[53],"enabling":[54,199],"information-theoretically":[56],"secure":[57,90],"exchange":[58],"encrypted":[60],"messages.":[61],"Fundamental":[62],"physics":[66],"ensure":[67],"that":[68],"QKD":[70,155,184,225,233,259,307,348,379,389,436,507,588,638],"detect":[72],"every":[73],"attempt":[74],"third":[77],"party":[78],"obtain":[80],"copy":[82],"key.":[85],"However,":[86],"for":[87,100,265,326,336,351,401,481,513,536,616,633],"many":[88],"applications,":[89],"connections":[91],"are":[95,103,120,131,150,274,312,354,552],"insufficient,":[96],"so":[97],"larger":[98],"networks":[99,260],"multiple":[101,208],"required.":[104],"On":[105],"way":[107],"widespread":[110],"use":[111],"QKD,":[113],"laboratory":[114],"experiments":[115],"under":[116,127],"controllable":[117],"environmental":[118],"conditions":[119,130],"only":[121],"first":[123,288,373,449],"step,":[124],"tests":[126],"realistic":[128,618],"operating":[129],"required":[132,350,433],"demonstrate":[134,158],"reliability":[136,160],"systems.":[139],"goals":[142],"presented":[146,497],"this":[148,173,291,468,562],"thesis":[149,292,469],"multi-user":[154,183,378],"network,":[156],"its":[159,547],"flexibility":[162,345,567],"test,":[166],"detailed":[170,471],"models":[171,473],"system":[174,229,253,349,589],"taking":[175],"relevant":[177],"setup":[178,575,622],"imperfections":[179,576],"into":[180],"account.":[181],"The":[182,287,306,342,464,605,624],"network":[185,191,302,380,430],"implemented":[187],"as":[188,447],"star-shaped":[190],"with":[192,212,242,303,314,521],"central":[194],"hub":[197],"(q-hub),":[198],"simultaneous":[200],"independent":[202],"pairs":[209,239],"distances":[213],"up":[214],"100":[216,319,407],"km":[217,408,414],"users.":[220,305],"In":[221],"contrast":[222],"other":[224,266],"networks,":[226],"q-hub":[228,252,301,476],"uses":[230],"polarization-insensitive":[232],"protocol":[234],"based":[235,381],"quantum-entangled":[237],"photon":[238,459,538,543],"combination":[241],"wavelength":[243],"demultiplexing":[244],"robust":[247],"transmissions.":[249],"well":[255],"suited":[256],"implement":[258],"urban":[262],"areas":[263],"or":[264,279],"applications":[267,353],"where":[268],"optical":[270],"fiber":[271,402,416],"transmission":[272],"links":[273],"exposed":[275],"weather":[278],"vibrations":[280],"which":[281,337,541],"may":[282],"lead":[283],"polarization":[285],"instabilities.":[286],"part":[289,466],"presents":[293,470],"implementation":[295],"performance":[297,628],"evaluation":[298],"four":[304],"receivers":[308,437],"synchronized":[313],"precision":[316],"better":[317],"than":[318,396,406],"ps":[320],"clock":[327],"recovery":[328],"from":[329,540,571],"arrival":[331],"times":[332],"photons":[335],"patent":[339],"pending.":[341],"compactness":[343],"real-world":[352],"proven":[355],"test":[359,370,375],"at":[360],"facility":[362],"Deutsche":[365],"Telekom":[366],"company.":[367],"This":[368],"was":[371],"Bennett-Brassard-Mermin":[384],"1992":[385],"(BBM92)":[386],"time":[387],"bin":[388],"protocol.":[390],"Stable":[391],"over":[394],"more":[395,405,454],"three":[397],"days":[398],"demonstrated":[400],"lengths":[403],"users,":[411],"including":[412],"27":[413],"deployed":[417],"field.":[420],"Dozens":[421],"could":[424],"be":[425],"readily":[426],"connected":[427],"if":[431],"number":[434,544],"were":[438],"built.":[439],"Finally,":[440,582],"photonic":[442],"integrated":[443],"circuit":[444],"designed":[446],"step":[450],"towards":[451],"even":[453],"compact":[455],"q-hub,":[456],"on-chip":[458],"pair":[460],"generation":[461],"demonstrated.":[463],"second":[465],"numerical":[472],"system.":[477,508],"A":[478,526],"time-dependent":[483],"tomographic":[484],"characterization":[485],"single-photon":[487],"detectors":[488,503],"terms":[490],"positive":[492],"operator-valued":[493],"measures":[494],"(POVMs)":[495],"applied":[499],"characterize":[501],"employed":[504],"Furthermore,":[509],"general":[511],"photon-number-resolved":[515],"simulation":[516,563,585,606,625],"multi-mode":[518],"quantum-optical":[519,580],"setups":[520],"Gaussian":[522,598],"states":[523,599],"developed.":[525],"result":[528],"derivation":[531],"generating":[534],"function":[535],"statistics,":[539],"moments":[548,551],"factorial":[550],"computed":[553],"automatic":[555],"differentiation.":[556],"One":[557],"strengths":[560],"include":[569],"effects":[570],"various":[572],"kinds":[573],"simulations":[578],"setups.":[581],"frequency-resolved":[584],"developed":[591],"generalizing":[593],"covariance":[595],"formalism":[596],"continuum":[602],"frequencies.":[604],"results":[607],"match":[608],"measurements":[610],"high":[613],"degree,":[614],"allowing":[615],"prediction":[619],"performance.":[623],"will":[626],"optimizations":[629],"cost":[631],"reductions":[632],"development":[635],"future":[637],"networks.":[639]},"counts_by_year":[],"updated_date":"2026-05-20T06:11:20.791850","created_date":"2025-10-10T00:00:00"}
