{"id":4627,"date":"2015-11-30T11:00:31","date_gmt":"2015-11-30T04:00:31","guid":{"rendered":"http:\/\/ttud.com.vn\/?p=4627"},"modified":"2017-10-02T09:43:00","modified_gmt":"2017-10-02T02:43:00","slug":"dich-chuyen-tuc-thoi-1-tin-nhan-tu-khoang-cach-2-km-bang-hien-tuong-roi-hat","status":"publish","type":"post","link":"https:\/\/casta.ttud.com.vn\/index.php\/dich-chuyen-tuc-thoi-1-tin-nhan-tu-khoang-cach-2-km-bang-hien-tuong-roi-hat\/","title":{"rendered":"&#8220;D\u1ecbch chuy\u1ec3n t\u1ee9c th\u1eddi&#8221; 1 tin nh\u1eafn t\u1eeb kho\u1ea3ng c\u00e1ch 2 km b\u1eb1ng hi\u1ec7n t\u01b0\u1ee3ng r\u1ed1i h\u1ea1t"},"content":{"rendered":"<p><strong>C\u00f2n nh\u1edb h\u1ed3i n\u0103m ngo\u00e1i c\u00e1c nh\u00e0 khoa h\u1ecdc \u0111\u00e3 l\u1ee3i d\u1ee5ng hi\u1ec7n t\u01b0\u1ee3ng r\u1ed1i h\u1ea1t c\u1ee7a 2 electron \u0111\u1ec3 th\u1ef1c hi\u1ec7n ph\u00e9p &#8220;d\u1ecbch chuy\u1ec3n t\u1ee9c th\u1eddi&#8221;, g\u1edfi \u0111i 1 th\u00f4ng \u0111i\u1ec7p trong kho\u1ea3ng c\u00e1ch 3 m\u00e9t. B\u00e2y gi\u1edd h\u1ecd \u0111\u00e3 x\u00e1c l\u1eadp m\u1ed9t k\u1ef7 l\u1ee5c m\u1edbi: m\u1edf r\u1ed9ng kho\u1ea3ng c\u00e1ch \u0111\u00f3 ra th\u00e0nh g\u1ea7n 2 km. T\u01b0\u01a1ng lai v\u1ec1 \u0111i\u1ec7n to\u00e1n l\u01b0\u1ee3ng t\u1eed, m\u1eadt m\u00e3 l\u01b0\u1ee3ng t\u1eed,&#8230; l\u1ea1i c\u00f3 th\u00eam m\u1ed9t b\u01b0\u1edbc ti\u1ebfn m\u1edbi \u0111\u1ec3 tr\u1edf n\u00ean g\u1ea7n v\u1edbi th\u1ef1c t\u1ebf h\u01a1n.<\/strong><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-5088\" src=\"http:\/\/ttud.com.vn\/wp-content\/uploads\/2015\/11\/30112015142052-duytran3559106_cv_roi_hat_tinhte.jpg\" alt=\"\" width=\"280\" height=\"186\" \/><\/p>\n<p>R\u1ed1i h\u1ea1t c\u00f2n g\u1ecdi l\u00e0 v\u01b0\u1edbng v\u00edu l\u01b0\u1ee3ng t\u1eed l\u00e0 m\u1ed9t hi\u1ec7u \u1ee9ng trong c\u01a1 h\u1ecdc l\u01b0\u1ee3ng t\u1eed m\u00e0 \u1edf \u0111\u00f3, tr\u1ea1ng th\u00e1i l\u01b0\u1ee3ng t\u1eed c\u1ee7a 2 ho\u1eb7c nhi\u1ec1u v\u1eadt th\u1ec3 c\u00f3 th\u1ec3 c\u00f3 li\u00ean h\u1ec7 v\u1edbi nhau d\u00f9 ch\u00fang \u1edf kho\u1ea3ng c\u00e1ch n\u00e0o. Trong m\u1ed9t v\u00ed d\u1ee5, c\u00f3 th\u1ec3 t\u1ea1o ra 2 v\u1eadt th\u1ec3 m\u00e0 n\u1ebfu spin c\u1ee7a v\u1eadt th\u1ec3 n\u00e0y quay xu\u1ed1ng d\u01b0\u1edbi th\u00ec spin c\u1ee7a c\u00e1i kia s\u1ebd quay l\u00ean, ho\u1eb7c ng\u01b0\u1ee3c l\u1ea1i, c\u00f3 th\u1ec3 spin c\u1ee7a c\u1ea3 2 s\u1ebd gi\u1ed1ng nhau.<\/p>\n<p>Xin n\u00f3i th\u00eam, spin l\u00e0 m\u1ed9t \u0111\u1ea1i l\u01b0\u1ee3ng v\u1eadt l\u00fd, b\u1ea3n ch\u1ea5t l\u00e0 m\u1ed9t momen \u0111\u1ed9ng l\u01b0\u1ee3ng v\u00e0 l\u00e0 m\u1ed9t kh\u00e1i ni\u1ec7m thu\u1ea7n t\u00fay l\u01b0\u1ee3ng t\u1eed m\u00e0 kh\u00f4ng c\u00f3 s\u1ef1 t\u01b0\u01a1ng \u1ee9ng trong c\u01a1 h\u1ecdc c\u1ed5 \u0111i\u1ec3n. N\u1ebfu nh\u01b0 trong c\u01a1 h\u1ecdc c\u1ed5 \u0111i\u1ec3n momen \u0111\u01b0\u1ee3c bi\u1ec3u di\u1ec5n b\u1eb1ng c\u00f4ng th\u1ee9c L = r x p th\u00ec trong c\u01a1 h\u1ecdc l\u01b0\u1ee3ng t\u1eed, momen spin v\u1eabn t\u1ed3n t\u1ea1i m\u1eb7c d\u00f9 h\u1ea1t c\u00f3 kh\u1ed1i l\u01b0\u1ee3ng b\u1eb1ng 0 b\u1edfi l\u1ebd spin l\u00e0 b\u1ea3n ch\u1ea5t n\u1ed9i t\u1ea1i c\u1ee7a h\u1ea1t \u0111\u00f3. C\u00e1c h\u1ea1t c\u01a1 b\u1ea3n \u0111\u1ec1u c\u00f3 spin b\u1eb1ng 1\/2 ngay c\u1ea3 khi n\u00f3 l\u00e0 ch\u1ea5t \u0111i\u1ec3m ho\u1eb7c kh\u00f4ng c\u00f3 c\u1ea3 c\u1ea5u tr\u00fac n\u1ed9i t\u1ea1i.<\/p>\n<p>B\u1eb1ng c\u00e1ch l\u1ee3i d\u1ee5ng hi\u1ec7n t\u01b0\u1ee3ng r\u1ed1i ren c\u1ee7a c\u00e1c h\u1ea1t c\u01a1 b\u1ea3n m\u00e0 c\u1ee5 th\u1ec3 \u1edf \u0111\u00e2y l\u00e0 c\u00e1c electron, c\u00e1c nh\u00e0 nghi\u00ean c\u1ee9u t\u1ea1i \u0110\u1ea1i h\u1ecdc Stanford tuy\u00ean b\u1ed1 \u0111\u00e3 g\u1edfi \u0111i m\u1ed9t th\u00f4ng \u0111i\u1ec7p b\u1eb1ng 2 electron v\u01b0\u1edbng v\u00edu nhau t\u1eeb kho\u1ea3ng c\u00e1ch 2 km. Nh\u00e0 v\u1eadt l\u00fd h\u1ecdc Leo Yu, m\u1ed9t th\u00e0nh vi\u00ean trong nh\u00f3m nghi\u00ean c\u1ee9u cho bi\u1ebft: &#8220;Spin c\u1ee7a electron l\u00e0 m\u1ed9t \u0111\u01a1n v\u1ecb c\u01a1 b\u1ea3n trong m\u00e1y t\u00ednh l\u01b0\u1ee3ng t\u1eed. Nghi\u00ean c\u1ee9u l\u1ea7n n\u00e0y c\u00f3 th\u1ec3 m\u1edf \u0111\u01b0\u1eddng cho s\u1ef1 ph\u00e1t tri\u1ec3n c\u1ee7a m\u1ea1ng l\u01b0\u1edbi l\u01b0\u1ee3ng t\u1eed, cho ph\u00e9p ch\u00fang ta g\u1edfi d\u1eef li\u1ec7u v\u1edbi \u0111\u1ed9 an to\u00e0n c\u1ef1c cao t\u1eeb kh\u1eafp n\u01a1i tr\u00ean th\u1ebf gi\u1edbi.&#8221;<\/p>\n<p>Tuy nhi\u00ean v\u1ea5n \u0111\u1ec1 \u1edf \u0111\u00e2y l\u00e0 c\u00e1c electron b\u1ecb gi\u1edbi h\u1ea1n trong c\u00e1c nguy\u00ean t\u1eed. V\u00e0 \u0111\u1ec3 &#8220;g\u1ee1&#8221; \u0111\u01b0\u1ee3c 2 electron \u0111\u1ec3 r\u1ed1i ren qua 1 kho\u1ea3ng c\u00e1ch d\u00e0i (v\u00e0 cho ph\u00e9p c\u00e1c m\u00e1y t\u00ednh trong m\u1ea1ng l\u01b0\u1ee3ng t\u1eed giao ti\u1ebfp v\u1edbi nhau) th\u00ec ng\u01b0\u1eddi ta c\u1ea7n d\u00f9ng c\u00e1c photon h\u00e0nh \u0111\u1ed9ng nh\u01b0 m\u1ed9t &#8220;s\u1ee9 gi\u1ea3&#8221; truy\u1ec1n th\u00f4ng \u0111i\u1ec7p.<\/p>\n<p>\u00c1p d\u1ee5ng c\u00e1ch l\u00e0m n\u00e0y, c\u00e1c nh\u00e0 nghi\u00ean c\u1ee9u \u0111\u00e3 &#8220;gh\u00e9p n\u1ed1i&#8221; photon v\u00e0 electron th\u00f4ng qua qu\u00e1 tr\u00ecnh g\u1ecdi l\u00e0 &#8220;t\u01b0\u01a1ng quan l\u01b0\u1ee3ng t\u1eed&#8221;. Tuy nhi\u00ean, b\u1ea5y gi\u1edd xu\u1ea5t hi\u1ec7n m\u1ed9t v\u1ea5n \u0111\u1ec1 n\u1eefa l\u00e0 c\u00e1c photon c\u00f3 th\u1ec3 thay \u0111\u1ed5i h\u01b0\u1edbng spin trong qu\u00e1 tr\u00ecnh di chuy\u1ec3n trong s\u1ee3i c\u00e1p quang. \u0110\u1ec3 kh\u1eafc ph\u1ee5c \u0111i\u1ec1u n\u00e0y, nh\u00f3m nghi\u00ean c\u1ee9u t\u1ea1i Stanford \u0111\u00e3 t\u1ea1o ra m\u1ed9t &#8220;com tem th\u1eddi gian&#8221; \u1ee9ng x\u1eed nh\u01b0 m\u1ed9t \u0111i\u1ec3m tham chi\u1ebfu cho c\u00e1c photon, cho ph\u00e9p ch\u00fang ta x\u00e1c nh\u1eadn r\u1eb1ng c\u00e1c photon \u0111\u01b0\u1ee3c \u0111\u01b0a t\u1edbi \u0111\u00edch v\u1edbi spin \u0111\u00fang chi\u1ec1u ban \u0111\u1ea7u.<\/p>\n<p>V\u00e0 cu\u1ed1i c\u00f9ng, nh\u00f3m nghi\u00ean c\u1ee9u \u0111\u00e3 t\u1ea1o n\u00ean c\u1eb7p electron v\u01b0\u1edbng v\u00edu c\u00e1ch nhau 2 km th\u00f4ng qua m\u1ed9t s\u1ee3i c\u00e1p quang d\u1eabn photon T\u1eeb \u0111\u00e2y, hy v\u1ecdng v\u1ec1 nh\u1eefng h\u1ec7 th\u1ed1ng \u0111i\u1ec7n to\u00e1n l\u01b0\u1ee3ng t\u1ef1, m\u1eadt m\u00e3 l\u01b0\u1ee3ng t\u1eed v\u00e0 c\u1ea3 vi\u1ec5n th\u00f4ng \u0111i\u1ec7n t\u1eed l\u1ea1i c\u00f3 th\u00eam b\u01b0\u1edbc ti\u1ebfn m\u1edbi, \u0111\u01b0a n\u00f3 t\u1edbi g\u1ea7n v\u1edbi th\u1ef1c t\u1ebf h\u01a1n.<\/p>\n<p style=\"text-align: right;\"><strong><em>Tham kh\u1ea3o Stanford, Engadget, Wiki\u200b<\/em><\/strong><\/p>\n<p style=\"text-align: right;\"><em>Ngu\u1ed3n tinhte.vn<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"<p>C\u00f2n nh\u1edb h\u1ed3i n\u0103m ngo\u00e1i c\u00e1c nh\u00e0 khoa h\u1ecdc \u0111\u00e3 l\u1ee3i d\u1ee5ng hi\u1ec7n t\u01b0\u1ee3ng r\u1ed1i h\u1ea1t c\u1ee7a 2 electron \u0111\u1ec3 th\u1ef1c hi\u1ec7n ph\u00e9p &#8220;d\u1ecbch chuy\u1ec3n t\u1ee9c th\u1eddi&#8221;, g\u1edfi \u0111i 1 th\u00f4ng \u0111i\u1ec7p trong kho\u1ea3ng c\u00e1ch 3 m\u00e9t. B\u00e2y gi\u1edd h\u1ecd \u0111\u00e3 x\u00e1c l\u1eadp m\u1ed9t k\u1ef7 l\u1ee5c m\u1edbi: m\u1edf r\u1ed9ng kho\u1ea3ng c\u00e1ch \u0111\u00f3 ra th\u00e0nh g\u1ea7n [&hellip;]<\/p>\n","protected":false},"author":17,"featured_media":5088,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[47],"tags":[],"class_list":["post-4627","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-tin-tuc"],"_links":{"self":[{"href":"https:\/\/casta.ttud.com.vn\/index.php\/wp-json\/wp\/v2\/posts\/4627","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/casta.ttud.com.vn\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/casta.ttud.com.vn\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/casta.ttud.com.vn\/index.php\/wp-json\/wp\/v2\/users\/17"}],"replies":[{"embeddable":true,"href":"https:\/\/casta.ttud.com.vn\/index.php\/wp-json\/wp\/v2\/comments?post=4627"}],"version-history":[{"count":3,"href":"https:\/\/casta.ttud.com.vn\/index.php\/wp-json\/wp\/v2\/posts\/4627\/revisions"}],"predecessor-version":[{"id":5089,"href":"https:\/\/casta.ttud.com.vn\/index.php\/wp-json\/wp\/v2\/posts\/4627\/revisions\/5089"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/casta.ttud.com.vn\/index.php\/wp-json\/wp\/v2\/media\/5088"}],"wp:attachment":[{"href":"https:\/\/casta.ttud.com.vn\/index.php\/wp-json\/wp\/v2\/media?parent=4627"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/casta.ttud.com.vn\/index.php\/wp-json\/wp\/v2\/categories?post=4627"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/casta.ttud.com.vn\/index.php\/wp-json\/wp\/v2\/tags?post=4627"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}