Thaum ib tug tam sim no siv rau ib tug nyias txheej ntawm tungsten diselenide, nws pib ci nyob rau hauv ib tug heev txawv txawv zam. Ntxiv rau cov teeb pom kev zoo tib yam, uas lwm cov khoom siv hluav taws xob tuaj yeem tawm, tungsten diselenide kuj tsim ib hom tshwj xeeb ntawm lub teeb quantum, uas yog tsim los ntawm cov ntsiab lus tshwj xeeb ntawm cov khoom. Nws muaj ib tug series ntawm photons uas ib txwm emission ib tug los ntawm ib tug - yeej tsis nyob rau hauv khub los yog nyob rau hauv bunches. Cov nyhuv anti-bunching no zoo meej rau kev sim hauv thaj tsam ntawm quantum cov ntaub ntawv thiab quantum cryptography, qhov twg ib qho photons xav tau. Txawm li cas los xij, tau ntau xyoo, qhov emission no tseem yog qhov tsis paub.

Cov kws tshawb fawb ntawm TU Vienna tam sim no tau piav qhia qhov no: Kev sib cuam tshuam me me ntawm ib qho atomic tsis xws luag hauv cov khoom thiab cov khoom siv tshuab yog lub luag haujlwm rau lub teeb quantum no. Lub computer simulations qhia tias cov electrons raug tsav mus rau qhov chaw tshwj xeeb hauv cov khoom siv, qhov twg lawv raug ntes los ntawm qhov tsis xws luag, poob lub zog thiab emit ib photon. Txoj kev daws teeb meem rau quantum teeb puzzle tam sim no tau luam tawm nyob rau hauv Physical Review Letters.

Tsuas yog peb lub atom tuab

Tungsten diselenide yog cov khoom siv ob sab uas tsim cov txheej nyias nyias. Xws li cov khaubncaws sab nraud povtseg tsuas yog peb txheej atomic tuab, nrog tungsten atoms nyob nruab nrab, ua ke rau selenium atoms hauv qab thiab saum toj no. "Yog hais tias lub zog tau muab rau cov txheej txheem, piv txwv li los ntawm kev siv hluav taws xob hluav taws xob lossis los ntawm irradiating nws nrog lub teeb ntawm lub wavelength uas tsim nyog, nws pib ci," piav qhia Lukas Linhart los ntawm lub koom haum theoretical Physics ntawm TU Vienna. "Qhov no hauv nws tus kheej tsis txawv, ntau cov ntaub ntawv ua li ntawd. Txawm li cas los xij, thaum lub teeb emissions los ntawm tungsten diselenide tau soj ntsuam kom meej, ntxiv rau lub teeb pom kev zoo ib yam tshwj xeeb ntawm lub teeb nrog cov khoom txawv txawv tau kuaj pom. "

Qhov tshwj xeeb quantum teeb no muaj cov photons ntawm cov wavelengths tshwj xeeb - thiab lawv ib txwm tso tawm ib leeg. Nws yeej tsis tshwm sim uas ob photons ntawm tib lub wavelength raug kuaj pom tib lub sijhawm. "Qhov no qhia peb tias cov photons tsis tuaj yeem raug tsim los ntawm cov khoom siv, tab sis yuav tsum muaj qee cov ntsiab lus hauv cov qauv tungsten diselenide uas tsim ntau cov photons, ib qho tom qab," piav qhia xibfwb Florian Libisch, uas nws kev tshawb fawb tsom mus rau ob. - cov ntaub ntawv seem.

Piav qhov txiaj ntsig no yuav tsum muaj kev nkag siab ntxaws txog tus cwj pwm ntawm cov khoom siv hluav taws xob hauv cov khoom ntawm qib quantum lub cev. Cov hluav taws xob hauv tungsten diselenide tuaj yeem tuav lub zog sib txawv. Yog hais tias ib qho hluav taws xob hloov los ntawm lub xeev ntawm lub zog siab mus rau lub xeev qis zog, lub photon raug tso tawm. Txawm li cas los xij, qhov no dhia mus rau qis zog tsis yog ib txwm tso cai: Lub tshuab hluav taws xob yuav tsum ua raws li qee txoj cai - kev txuag ntawm lub zog ntawm lub zog thiab lub zog angular.

Raws li cov cai tswj kev txuag no, ib qho hluav taws xob hauv lub xeev lub zog quantum yuav tsum nyob twj ywm nyob ntawd - tshwj tsis yog muaj qee qhov tsis zoo hauv cov khoom tso cai rau lub zog hloov pauv. "Ib txheej tungsten diselenide yeej tsis zoo tag nrho. Hauv qee qhov chaw, ib lossis ntau dua selenium atoms yuav ploj mus, "hais tias Lukas Linhart. "Qhov no kuj hloov lub zog ntawm electron xeev hauv cheeb tsam no."

Ntxiv mus, cov khoom txheej tsis yog lub dav hlau zoo meej. Zoo li ib daim pam uas wrinkles thaum kis thoob lub hauv ncoo, tungsten diselenide stretches hauv zos thaum cov khoom txheej raug tshem tawm ntawm cov qauv me me. Cov kev ntxhov siab ntawm kev siv tshuab no kuj muaj feem cuam tshuam rau lub xeev hluav taws xob hluav taws xob.

"Kev sib cuam tshuam ntawm cov khoom tsis xws luag thiab cov kab mob hauv zos yog qhov nyuaj. Txawm li cas los xij, tam sim no peb tau ua tiav hauv simulating ob qho tib si ntawm lub computer, "hais tias Lukas Linhart. "Thiab nws hloov tawm tias tsuas yog kev sib xyaw ua ke ntawm cov teebmeem no tuaj yeem piav qhia txog lub teeb txawv txawv."

Nyob rau hauv cov cheeb tsam microscopic ntawm cov khoom, qhov uas tsis xws luag thiab nto strains tshwm ua ke, lub zog theem ntawm cov electrons hloov los ntawm ib tug siab mus rau ib tug tsawg zog xeev thiab emit ib tug photon. Cov kev cai ntawm quantum physics tsis tso cai rau ob lub electrons nyob rau hauv tib lub xeev nyob rau tib lub sij hawm, thiab yog li ntawd, cov electrons yuav tsum undergo tus txheej txheem no ib tug los ntawm ib tug. Yog li ntawd, cov photons raug tso tawm ib los ntawm ib qho, thiab.

Nyob rau tib lub sijhawm, cov neeg siv tshuab distortion ntawm cov khoom pab tau ua kom ntau ntau ntawm cov hluav taws xob yog kom muaj rau kauj ruam hauv qab ntawm ib lub xeev tau hloov pauv nws lub xeev thiab embor photon.

Qhov txiaj ntsig no qhia tau hais tias cov ntaub ntawv ultrathin 2-D qhib qhov muaj peev xwm tshiab rau cov ntaub ntawv tshawb fawb.