{"id":410,"date":"2019-04-04T21:07:17","date_gmt":"2019-04-04T20:07:17","guid":{"rendered":"http:\/\/wp.lancs.ac.uk\/laird-group\/?page_id=410"},"modified":"2019-04-04T21:08:36","modified_gmt":"2019-04-04T20:08:36","slug":"quantum-interference-on-a-mesoscopic-scale","status":"publish","type":"page","link":"http:\/\/wp.lancs.ac.uk\/laird-group\/research\/quantum-interference-on-a-mesoscopic-scale\/","title":{"rendered":"Quantum interference on a mesoscopic scale"},"content":{"rendered":"<p>When an electron moves through a molecule, we can only predict its behaviour by assuming that it follows a quantum superposition of paths. However, on an everyday scale superpositions are never encountered. What happens to moving objects at an intermediate scale of millions of atoms?<\/p>\n<p>We have proposed a nanomechanical on-chip interferometer in which the particle under test is and entire nanotube, containing thousands to millions of atoms (see figure). It uses a suspended nanotube as one SQUID arm of a transmon-type qubit (a \u2018gatemon\u2019). We are now planning to implement this proposal. This would be a landmark demonstration of quantum behaviour, demonstrating that spatial quantum interference applies to masses a thousand times larger than in the best molecular-beam interferometers.<\/p>\n<div id=\"attachment_411\" style=\"width: 306px\" class=\"wp-caption aligncenter\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-411\" class=\"size-medium wp-image-411\" src=\"https:\/\/i0.wp.com\/wp.lancs.ac.uk\/laird-group\/files\/2019\/04\/Khosla-PRX-Fig1ab.png?resize=300%2C225\" alt=\"\" width=\"300\" height=\"225\" srcset=\"https:\/\/i0.wp.com\/wp.lancs.ac.uk\/laird-group\/files\/2019\/04\/Khosla-PRX-Fig1ab.png?resize=300%2C225 300w, https:\/\/i0.wp.com\/wp.lancs.ac.uk\/laird-group\/files\/2019\/04\/Khosla-PRX-Fig1ab.png?resize=768%2C577 768w, https:\/\/i0.wp.com\/wp.lancs.ac.uk\/laird-group\/files\/2019\/04\/Khosla-PRX-Fig1ab.png?resize=1024%2C769 1024w, https:\/\/i0.wp.com\/wp.lancs.ac.uk\/laird-group\/files\/2019\/04\/Khosla-PRX-Fig1ab.png?w=1400 1400w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><p id=\"caption-attachment-411\" class=\"wp-caption-text\"><span style=\"color: #000080\"><strong>Figure: The &#8220;displacemon&#8221; proposal for measuring mechanical quantum interference.<\/strong> (a) Circuit diagram. (b) Device geometry. Modulation of the magnetic flux by the nanotube\u2019s motion gives rise to strong qubit-mechanical coupling.<\/span><\/p><\/div>\n","protected":false},"excerpt":{"rendered":"<p>When an electron moves through a molecule, we can only predict its behaviour by assuming that it follows a quantum superposition of paths. However, on an everyday scale superpositions are never encountered. What happens to moving objects at an intermediate scale of millions of atoms? We have proposed a nanomechanical on-chip interferometer in which the&hellip;<\/p>\n","protected":false},"author":927,"featured_media":0,"parent":20,"menu_order":5,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"jetpack_post_was_ever_published":false,"footnotes":""},"class_list":["post-410","page","type-page","status-publish","hentry"],"jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/P9QgAe-6C","_links":{"self":[{"href":"http:\/\/wp.lancs.ac.uk\/laird-group\/wp-json\/wp\/v2\/pages\/410","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/wp.lancs.ac.uk\/laird-group\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"http:\/\/wp.lancs.ac.uk\/laird-group\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"http:\/\/wp.lancs.ac.uk\/laird-group\/wp-json\/wp\/v2\/users\/927"}],"replies":[{"embeddable":true,"href":"http:\/\/wp.lancs.ac.uk\/laird-group\/wp-json\/wp\/v2\/comments?post=410"}],"version-history":[{"count":1,"href":"http:\/\/wp.lancs.ac.uk\/laird-group\/wp-json\/wp\/v2\/pages\/410\/revisions"}],"predecessor-version":[{"id":412,"href":"http:\/\/wp.lancs.ac.uk\/laird-group\/wp-json\/wp\/v2\/pages\/410\/revisions\/412"}],"up":[{"embeddable":true,"href":"http:\/\/wp.lancs.ac.uk\/laird-group\/wp-json\/wp\/v2\/pages\/20"}],"wp:attachment":[{"href":"http:\/\/wp.lancs.ac.uk\/laird-group\/wp-json\/wp\/v2\/media?parent=410"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}