Ma'ajiyar Photon a cikin ƙwaƙwalwar ƙwayar ƙwayar ƙwayar cuta ta ƙasa

Ma'ajiyar Photon a cikin ƙwaƙwalwar ƙwayar ƙwayar ƙwayar cuta ta ƙasa

Ɗaukar hoto guda ɗaya sune mafi kyawun dillalan bayanai na ƙididdigewa, musamman tunda suna da sauri, da kyar suke mu'amala da muhalli ko tare da juna, kuma manyan abubuwan more rayuwa don rarraba su yanzu ana samunsu.

Yanzu, kafin cibiyoyin sadarwa su zama ƙididdigewa, ana buƙatar ƙwaƙwalwar ƙididdiga masu dacewa da photon guda ɗaya. Ana buƙatar shi don komai daga sadarwar buffer zuwa daidaita ayyukan sarrafawa. Da kyau, waɗannan abubuwan tunawa yakamata su kasance cikin sauri, inganci da sauƙi, suna aiki kusa da zafin jiki ba tare da buƙatar hadaddun fasaha kamar cryogenics ko matsananciyar matsananci ba.

A wani bincike na baya-bayan nan. masu bincike daga Jami'ar Basel a cikin rukunin Prof. Philipp Treutlein yanzu ya ƙirƙira ƙwaƙwalwar ƙira wanda ya dogara da iskar atom ɗin da ke cikin tantanin halitta gilashi.

Atom ɗin ba sa buƙatar sanyaya na musamman, wanda ke sa ƙwaƙwalwar ajiya cikin sauƙi don samarwa da haɓakawa, har ma don aikace-aikacen tauraron dan adam. Bugu da kari, da masu bincike gano tushen tushen photon guda ɗaya wanda ya ba su damar gwada inganci da lokacin ajiya na ƙwaƙwalwar ƙididdiga. An buga sakamakon su kwanan nan a cikin mujallar kimiyya PRX Quantum.

"A cikin aikinmu, muna nuna babban bandwidth mai ɗaukar hoto guda ɗaya da maidowa a kan dandamalin zafin jiki na ɗaki, wanda ya ƙunshi tushen hoto guda ɗaya dangane da rashin daidaituwa na kwatsam (SPDC) da ƙwaƙwalwar ƙima da aka haɗa a cikin tururin atomic. dumi. " Binciken ya ambaci.

Zafafan zarra a cikin ƙwayoyin tururi

Gianni Buser, wanda ya yi aiki a kan gwajin a matsayin Ph.D, ya ce "An bincika dacewa da zazzafan atom a cikin ƙwayoyin tururi don ƙwaƙwalwar ƙididdiga a cikin shekaru ashirin da suka gabata. dalibi. "Yawanci, duk da haka, an yi amfani da katako na laser da aka rage - sabili da haka hasken gargajiya - an yi amfani da shi." A cikin haske na al'ada, adadin photons da ke isa ga tantanin halitta a cikin wani lokaci da aka ba da shi yana bin rarraba ƙididdiga; a matsakaicin photon daya ne, amma wani lokacin yana iya zama biyu, uku ko babu.

Bayar da Ƙwaƙwalwar Ƙwaƙwalwar Ƙwaƙwalwar Ƙwaƙwalwar Ƙwaƙwalwar Ƙwaƙwalwar Ƙwaƙwalwar Ƙwaƙwalwar Ƙwaƙwalwar Ƙwaƙwalwar Ƙwaƙwalwar Ƙaƙwalwar Ƙaƙwalwar Ƙaƙwalwar Ƙaƙwalwar Ƙaƙwalwar Ƙaƙwalwar Ƙaƙwalwar Ƙaƙwalwar Ƙwararren Ƙwararren Ƙwararren Ƙwararren Ƙwararren Ƙwararren Ƙwararren Ƙwararren Ƙwararren Ƙwararren Ƙwararren Ƙwararren Ƙwararren Ƙwararren Ƙwararren Ƙwararren Ƙwararren Ƙwararren Ƙwararren Ƙwararren Ƙwararren Ƙwararren Ƙwaƙwalwa na Ƙaƙwalwa na Ƙaƙwalwa na Ƙaƙwalwa na Ƙaƙwalwa na Ƙaƙwalwa na Ƙaƙwalwa ) a Lokacin da Ya dace

Don gwada ƙwaƙwalwar ƙididdiga tare da "hasken ƙididdiga" - wato, ko da yaushe daidai photon ɗaya - Treutlein da abokan aikinsa sun haɓaka tushen hoto guda ɗaya wanda ke fitar da ainihin photon guda ɗaya a lokaci guda. Lokaci. Nan take wannan ya faru ana sanar da shi ta hanyar photon na biyu, wanda koyaushe ana aika shi lokaci guda tare da na farko. Wannan yana ba da damar ƙwaƙwalwar ƙididdiga ta kunna a lokacin da ya dace.

Ana tura photon guda ɗaya zuwa ƙwaƙwalwar ƙima, inda, tare da taimakon na'urar sarrafa laser, photon yana haifar da fiye da biliyan rubidium atom don ɗaukan abin da ake kira babban matsayi na matakan makamashi biyu na atom.

Photon kanta yana ɓacewa a cikin tsari, amma bayanin da ke cikinsa yana canzawa zuwa matsayi mafi girma na atom. Takaitaccen bugun bugun jini daga Laser mai sarrafawa zai iya karanta wannan bayanin bayan wani lokacin ajiya kuma ya mayar da shi zuwa photon.

Rage hayaniyar karantawa

"Har yanzu, wani batu mai mahimmanci ya kasance amo - ƙarin haske da aka samar yayin karatu wanda zai iya lalata ingancin photon," in ji Roberto Mottola, wani Ph.D. dalibi a dakin gwaje-gwaje na Treutlein. Ta hanyar amfani da ƴan dabaru, masana kimiyyar lissafi sun sami damar rage wannan ƙara ta yadda, bayan lokutan ajiya na nanoseconds ɗari da yawa, ingancin photon guda ɗaya ya kasance har yanzu.

"Wadannan lokutan ajiya ba su da tsayi sosai, kuma ba a zahiri ba mu inganta su don wannan binciken," in ji Treutlein, "amma yanzu sun fi tsawon lokacin da aka adana hotuna guda ɗari." Wannan yana nufin cewa adadin ƙwaƙwalwar ajiya ta haɓaka ta masu bincike Ana iya amfani da Basel don aikace-aikace masu ban sha'awa. Misali, yana iya aiki tare da samar da photon guda ɗaya ba da gangan, waɗanda za'a iya amfani da su a aikace-aikacen bayanan ƙididdiga daban-daban.

Halayen karatu

masu bincike ya ba da rahoton adanawa da dawo da photon guda ɗaya a cikin ƙwaƙwalwar ƙwayar ƙwayar ƙwayar cuta ta atomic a cikin yanayin ƙasa. Tsarin ƙwaƙwalwar ajiyarsa yana kashe ƙarar ƙarar ta hanyar yin amfani da ƙa'idodin zaɓi na polarization a cikin tsarin hyperfine na atomic da aiki a bandwidth mafi girma fiye da ƙimar ruɓewar yanayi mai daɗi.

Suna haɗa ƙwaƙwalwar atomic tare da tushen hoto guda ɗaya dangane da haɓakar haɓakar haɓakar ƙa'idodin ƙa'ida (SPDC), wanda suka gina don wannan dalili tare da ingantattun halaye da halayen aiki idan aka kwatanta da aikinsu na baya.

Ana adana hotuna guda ɗaya daga wannan tushen a cikin ƙwaƙwalwar atomatik kuma ana dawo dasu tare da ƙididdige ƙididdiga na lambar photon waɗanda ba na al'ada ba, buɗe wasu damammaki masu yawa don gwaje-gwajen ƙididdige adadin bandwidth mai girma a cikin tsarin zafin daki.

Ta hanyar kwaikwayo a cikin binciken, sun kafa taswirar hanya don ingantawa na gaba wanda za su cimma nasara na zamani a lokaci guda.

Maganar Jarida

    Ma'ajiyar hoto guda ɗaya a cikin tate vapor cell solo-S quantum memory; Gianni Buser, Roberto Mottola, Björn Cotting, Janik Wolters da Philipp Treutlein. PRX jimla 3, 020349 DOI: 10.1103/PRXQuantum.3.020349

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