Lub ntiaj teb tau tawg dhau qhov txwv quantum key thawj zaug

Lub ntiaj teb tau tawg dhau qhov txwv quantum key thawj zaug. Tus nqi tseem ceeb ntawm qhov chaw ib leeg-photon tiag tiag tau nce siab txog 79%.

Kev faib tawm ntawm Quantum Key(QKD) yog ib qho thev naus laus zis encryption raws li cov ntsiab cai quantum physical thiab qhia txog lub peev xwm zoo hauv kev txhim kho kev ruaj ntseg kev sib txuas lus. Cov thev naus laus zis no xa cov yuam sij encryption los ntawm kev siv cov xeev quantum ntawm photons lossis lwm yam khoom me me. Vim tias cov xeev quantum no tsis tuaj yeem rov ua dua lossis ntsuas yam tsis hloov lawv cov xeev, nws ua rau muaj kev nyuaj rau cov neeg phem los cuam tshuam cov ntsiab lus sib txuas lus ntawm ob tog yam tsis raug kuaj pom. Vim yog qhov nyuaj hauv kev npaj cov peev txheej ib leeg-photon (SPS), feem ntau ntawm cov kab ke quantum key distribution (QKD) tam sim no tsim nyob ntawm attenuatedcov chaw teeb pom kev zoouas ua kom pom cov photons ib leeg, xws li cov laser pulses uas tsis muaj zog heev. Vim tias cov laser pulses no kuj tseem yuav tsis muaj photons lossis ntau photons, tsuas yog li ntawm 37% ntawm cov pulses siv hauv lub kaw lus tuaj yeem siv los tsim cov yuam sij kev ruaj ntseg. Cov kws tshawb fawb Suav tau nyuam qhuav kov yeej cov kev txwv ntawm qhov kev faib tawm quantum Key (QKD) uas tau thov ua ntej. Lawv tau siv cov peev txheej ib leeg-photon tiag tiag (SPS, uas yog, cov kab ke uas muaj peev xwm tso tawm cov photons ib leeg thaum xav tau).

Lub hom phiaj tseem ceeb ntawm cov kws tshawb fawb yog los tsim kom muaj lub cev muaj peev xwm tso tawm cov photons ci ntsa iab thaum xav tau, yog li kov yeej cov kev txwv tseem ceeb uas cov teeb pom kev tsis muaj zog uas siv yav dhau los los tsim cov kab ke quantum key distribution (QKD). Lawv cia siab tias lub kaw lus no tuaj yeem txhim kho kev ntseeg siab thiab kev ua tau zoo ntawm cov thev naus laus zis quantum key distribution (QKD), yog li ntawd tso lub hauv paus rau nws txoj kev xa mus rau yav tom ntej hauv lub ntiaj teb tiag tiag. Tam sim no, qhov kev sim tau ua tiav cov txiaj ntsig zoo heev vim tias lawv cov SPS tau pom tias muaj kev ua haujlwm zoo heev thiab ua rau muaj kev nce qib ntawm qhov uasQKD systemtsim cov yuam sij kev ruaj ntseg. Zuag qhia tag nrho, cov kev tshawb pom no qhia txog lub peev xwm ntawm SPS-based QKD systems, qhia tias lawv cov kev ua tau zoo tuaj yeem dhau qhov ntawm WCP-based QKD systems. "Peb tau ua pov thawj thawj zaug tias kev ua tau zoo ntawm QKD raws li SPS tshaj qhov txwv ntawm WCP," cov kws tshawb fawb hais. Hauv qhov kev sim QKD ntawm qhov chaw dawb hauv nroog channel nrog qhov poob ntawm 14.6 (1.1) dB, peb tau ua tiav qhov ruaj ntseg tseem ceeb (SKR) ntawm 1.08 × 10−3 bits ib lub zog, uas yog 79% siab dua qhov txwv tiag tiag ntawm QKD system raws li lub teeb tsis sib xws. Txawm li cas los xij, tam sim no, qhov poob channel siab tshaj plaws ntawm SPS-QKD system tseem qis dua li ntawm WCP-QKD system. Qhov poob channel qis dua uas cov kws tshawb fawb pom hauv lawv lub quantum key distribution (QKD) system tsis yog los ntawm lub system nws tus kheej, tab sis tau muab rau qhov seem ntau-photon effect hauv decoy-free protocol uas lawv tau khiav. Ua ib feem ntawm kev tshawb fawb yav tom ntej, lawv vam tias yuav txhim kho qhov kev kam rau siab ntawm lub kaw lus los ntawm kev ua kom zoo dua qhov kev ua tau zoo ntawm qhov chaw ib leeg-photon (SPS) ntawm txheej hauv qab ntawm lub kaw lus lossis qhia cov xeev bait rau hauv lub kaw lus. Nws ntseeg tau tias kev nce qib thev naus laus zis tas mus li yuav maj mam txhawb kev txhim kho ntawm quantum key distribution (QKD) mus rau kev siv tau thiab dav dav.