{"id":2866,"date":"2018-04-29T09:49:16","date_gmt":"2018-04-29T09:49:16","guid":{"rendered":"http:\/\/mraths.org.uk\/?page_id=2866"},"modified":"2018-08-16T18:47:09","modified_gmt":"2018-08-16T18:47:09","slug":"lasers-lidar","status":"publish","type":"page","link":"https:\/\/mraths.org.uk\/?page_id=2866","title":{"rendered":"1990 – Demonstration of entangled photons"},"content":{"rendered":"

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Click on the above image to enlarge<\/em><\/p>\n

Photon Entanglement<\/strong><\/p>\n

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\nThe photograph shows eminent Malvern laser physicists John Rarity and Paul Tapster in their laboratory.\u00a0 The photograph was taken to illustrate their work on photon entanglement.\u00a0 This is a phenomenon in which pairs of photons (the tiny bundles of energy that carry visible light as well as radio waves, x-rays, infrared and ultraviolet energy etc.) have some of their properties ‘locked’ to the other one of the pair. Thus, if we measure the properties of one, we can instantaneously deduce the properties of the other one in the pair.
\nIn the photograph, the intense blue laser beam is being shone through a special crystal and some of the photons will be split into two red light photons.\u00a0 The energy carried by the two red photons adds up to the energy brought in by the blue light photon.\u00a0 These pairs of red-light photons will be entangled.
\nEntangled photons can be used to transmit the ‘keys’ used to encrypt information for secure communications.\u00a0 John and Paul and their team went on to hold several world records for the distance over which these ‘keys’ could be sent.\u00a0 Strangely, many of these records were set with a pub at least at one end of the experiment!
\nEinstein called it \u201cspooky action at a distance\u201d
\n\"\"
\nCourtesy NASA\/JPL Caltech<\/p>\n","protected":false},"excerpt":{"rendered":"

Click on the above image to enlarge Photon Entanglement The photograph shows eminent Malvern laser physicists John Rarity and Paul Tapster in their laboratory.\u00a0 The photograph was taken to illustrate their work on photon entanglement.\u00a0 This is a phenomenon in which pairs of photons (the tiny bundles of energy that carry visible light as well … Continue reading 1990 – Demonstration of entangled photons<\/span><\/a><\/p>\n","protected":false},"author":5,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_acf_changed":false,"footnotes":""},"tags":[],"class_list":["post-2866","page","type-page","status-publish","hentry","no-featured-image"],"acf":[],"jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/P5hZum-Ke","_links":{"self":[{"href":"https:\/\/mraths.org.uk\/index.php?rest_route=\/wp\/v2\/pages\/2866","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/mraths.org.uk\/index.php?rest_route=\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/mraths.org.uk\/index.php?rest_route=\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/mraths.org.uk\/index.php?rest_route=\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/mraths.org.uk\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=2866"}],"version-history":[{"count":6,"href":"https:\/\/mraths.org.uk\/index.php?rest_route=\/wp\/v2\/pages\/2866\/revisions"}],"predecessor-version":[{"id":3664,"href":"https:\/\/mraths.org.uk\/index.php?rest_route=\/wp\/v2\/pages\/2866\/revisions\/3664"}],"wp:attachment":[{"href":"https:\/\/mraths.org.uk\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=2866"}],"wp:term":[{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/mraths.org.uk\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=2866"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}