Umhlaba udlule umkhawulo wokhiye we-quantum okokuqala ngqa

Umhlaba udlule umkhawulo wokhiye we-quantum okokuqala. Izinga lokhiye lomthombo we-single-photon weqiniso likhuphuke ngo-79%.

Ukusatshalaliswa Kokhiye We-Quantum(QKD) ubuchwepheshe bokubethela obusekelwe ezimisweni zomzimba ze-quantum futhi bubonisa amandla amakhulu okuthuthukisa ukuphepha kokuxhumana. Lobu buchwepheshe budlulisela okhiye bokubethela ngokusebenzisa izimo ze-quantum zama-photon noma ezinye izinhlayiya. Njengoba lezi zimo ze-quantum zingenakuphindwa noma zilinganiswe ngaphandle kokushintsha izimo zazo, kwandisa kakhulu ubunzima bamaqembu anonya bokuvimba okuqukethwe kokuxhumana phakathi kwezinhlangothi ezimbili ngaphandle kokutholwa. Ngenxa yobunzima bokulungiselela imithombo yangempela ye-single-photon (SPS), iningi lezinhlelo zokusabalalisa okhiye be-quantum (QKD) ezithuthukisiwe njengamanje zithembele ekuncishisweniimithombo yokukhanyaezilingisa ama-photon angawodwa, njenge-low-intensity laser pulses. Njengoba la ma-laser pulses engase angabi nama-photon noma ama-photon amaningi, cishe ama-37% kuphela ama-pulse asetshenziswa ohlelweni angasetshenziswa ukukhiqiza okhiye bokuphepha. Abacwaningi baseShayina basanda kunqoba ngempumelelo imikhawulo yohlelo lokusabalalisa i-quantum Key (QKD) olwaluhlongozwa ngaphambilini. Basebenzise imithombo yangempela ye-single-photon (i-SPS, okungukuthi, izinhlelo ezikwazi ukukhipha ama-photon ngamanye uma kudingeka).

Umgomo oyinhloko wabacwaningi ukwakha uhlelo olubonakalayo olukwazi ukukhipha ama-photon angama-single akhanya kakhulu uma kudingeka, ngaleyo ndlela kunqotshwe imikhawulo eyisisekelo ebhekene nemithombo yokukhanya ebuthaka esetshenziswa esikhathini esidlule ukwakha izinhlelo ze-quantum key distribution (QKD). Ithemba labo ukuthi lolu hlelo lungathuthukisa ukuthembeka nokusebenza kobuchwepheshe be-quantum key distribution (QKD), ngaleyo ndlela lubeke isisekelo sokusetshenziswa kwalo esikhathini esizayo ezindaweni zangempela. Njengamanje, ukuhlolwa kufinyelele imiphumela ethembisayo kakhulu ngoba i-SPS yabo itholakale isebenza kahle kakhulu futhi yandisa kakhulu izinga lapho i-Uhlelo lwe-QKDikhiqiza okhiye bokuphepha. Sekukonke, lokhu okutholakele kugqamisa amandla ezinhlelo ze-QKD ezisekelwe ku-SPS, okubonisa ukuthi ukusebenza kwazo kungadlula kakhulu okwamasistimu e-QKD asekelwe ku-WCP. “Sibonise okokuqala ukuthi ukusebenza kwe-QKD okusekelwe ku-SPS kudlula umkhawulo wesilinganiso esiyisisekelo se-WCP,” kusho abacwaningi. Ekuhlolweni kwe-QKD kwesiteshi sasemadolobheni esikhululekile ngokulahlekelwa yi-14.6(1.1) dB, sithole izinga lokhiye elivikelekile (i-SKR) lama-bits angu-1.08 × 10−3 nge-pulse, okwakuphakeme ngo-79% kunomkhawulo wangempela wesistimu ye-QKD ngokusekelwe ekukhanyeni okubuthakathaka. Kodwa-ke, okwamanje, ukulahlekelwa kwesiteshi okuphezulu kwesistimu ye-SPS-QKD kusephansi kunokwesistimu ye-WCP-QKD. Ukulahleka kwesiteshi okuphansi okubonwe abacwaningi ohlelweni lwabo lokusabalalisa ukhiye we-quantum (i-QKD) akuzange kuvele ohlelweni ngokwalo, kodwa kwabangelwa umphumela we-residual multi-photon kuphrothokholi engenakho ukukhohlisa ababeyisebenzisa. Njengengxenye yocwaningo lwesikhathi esizayo, banethemba lokuthuthukisa ukubekezelela ukulahlekelwa kwesistimu ngokwenza ngcono ukusebenza komthombo we-single-photon (SPS) ongqimbeni olungezansi lwesistimu noma ukungenisa izimo ze-bait ohlelweni. Kukholelwa ukuthi intuthuko eqhubekayo yezobuchwepheshe izokhuthaza kancane kancane ukuthuthukiswa kokusatshalaliswa kokhiye we-quantum (QKD) ekusetshenzisweni okusebenzayo nokujwayelekile.