Thawj quantum hloov ntawm lub dav hlau mus rau hauv av

Cov kws tshawb fawb German tau tswj hwm qhov kev sim nrog kev hloov pauv ntawm quantum cov ntaub ntawv los ntawm lub dav hlau mus rau hauv av. Lawv siv cov txheej txheem hu ua BB84, uas siv cov polarized photons xa cov quantum key los ntawm lub dav hlau ya ntawm yuav luag 300 km / h. Lub teeb liab tau txais ntawm qhov chaw nres tsheb hauv av 20 km deb.

Cov ntaub ntawv kaw tseg uas twb muaj lawm ntawm kev sib kis ntawm quantum cov ntaub ntawv los ntawm photons tau ua tiav ntev thiab ntev dua (144 km tau mus txog lub caij nplooj zeeg), tab sis nruab nrab ntawm cov ntsiab lus ruaj khov hauv ntiaj teb. Qhov teeb meem tseem ceeb ntawm quantum kev sib txuas lus ntawm cov ntsiab lus txav yog qhov ruaj khov ntawm polarized photons. Txhawm rau txo cov suab nrov, nws yog ib qho tsim nyog yuav tsum ua kom ruaj khov ntawm qhov sib txheeb ntawm lub transmitter thiab receiver.

Photons los ntawm lub dav hlau mus rau hauv av tau kis ntawm 145 me ntsis ib ob, siv ib tug hloov kho tus qauv laser kev sib txuas lus system.