{"id":532,"date":"2003-09-29T09:55:31","date_gmt":"2003-09-29T16:55:31","guid":{"rendered":"http:\/\/dabacon.org\/pontiff\/?p=532"},"modified":"2003-09-29T09:55:31","modified_gmt":"2003-09-29T16:55:31","slug":"followup-on-time-travel","status":"publish","type":"post","link":"https:\/\/dabacon.org\/pontiff\/2003\/09\/29\/followup-on-time-travel\/","title":{"rendered":"Followup on Time Travel"},"content":{"rendered":"<p>David Deutsch emailed me with nice comments and suggestions about my just posted <a href=\"http:\/\/arxiv.org\/abs\/quant-ph\/0309189\">paper<\/a>.  I told him the funny story behind the paper.<br \/>\nA few years ago I was watching a NOVA program about time travel and closed timelike curves.  On watching the program I thought: &#8220;hmm, I wonder if quantum circuits always give you self-consistent evolutions?&#8221;  After thinking about the problem for a few days, I was able to hack out a proof.  Only then did I decide to go look in the literature to see what others had done.  There I discovered Deutsch&#8217;s 1991 paper and found the result I had hacked out.  The scary thing was how close our two proof were (I seem to recall even the symbols we used were identitical!)  Getting deja vu when writing a paper on time travel is really spooky.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>David Deutsch emailed me with nice comments and suggestions about my just posted paper. I told him the funny story behind the paper. A few years ago I was watching a NOVA program about time travel and closed timelike curves. On watching the program I thought: &#8220;hmm, I wonder if quantum circuits always give you &hellip; <\/p>\n<p class=\"link-more\"><a href=\"https:\/\/dabacon.org\/pontiff\/2003\/09\/29\/followup-on-time-travel\/\" class=\"more-link\">Continue reading<span class=\"screen-reader-text\"> &#8220;Followup on Time Travel&#8221;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":false,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[63],"tags":[],"class_list":["post-532","post","type-post","status-publish","format-standard","hentry","category-quantum"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/dabacon.org\/pontiff\/wp-json\/wp\/v2\/posts\/532","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/dabacon.org\/pontiff\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/dabacon.org\/pontiff\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/dabacon.org\/pontiff\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/dabacon.org\/pontiff\/wp-json\/wp\/v2\/comments?post=532"}],"version-history":[{"count":0,"href":"https:\/\/dabacon.org\/pontiff\/wp-json\/wp\/v2\/posts\/532\/revisions"}],"wp:attachment":[{"href":"https:\/\/dabacon.org\/pontiff\/wp-json\/wp\/v2\/media?parent=532"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/dabacon.org\/pontiff\/wp-json\/wp\/v2\/categories?post=532"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/dabacon.org\/pontiff\/wp-json\/wp\/v2\/tags?post=532"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}