{"id":1891,"date":"2008-04-01T03:51:52","date_gmt":"2008-04-01T10:51:52","guid":{"rendered":"http:\/\/dabacon.org\/pontiff\/?p=1891"},"modified":"2008-04-01T03:51:52","modified_gmt":"2008-04-01T10:51:52","slug":"hot-quantum-computing","status":"publish","type":"post","link":"https:\/\/dabacon.org\/pontiff\/2008\/04\/01\/hot-quantum-computing\/","title":{"rendered":"Hot Quantum Computing!"},"content":{"rendered":"

Normally when I think about quantum computers, I think about systems which are pretty cold, since a thermal equilibrium state at high temperature is a very mixed state. But is it really true that a quantum computer needs to be cold to quantum compute? I’ve often wondered (some would say pontificated) about this, and so I was excited when I found this<\/a> Physical Review Letter describing quantum computing using plasmas.
\n
\nThe idea of this new approach, according to the paper, is to use modes in the Debye sheath as qubits. Because of the Child-Langmuir law, the current in this sheath is quantized and so we can perform single qubit gates in a manner not that similar to how we perform single qubit gates using flux based superconducting circuits. Two qubit gates are actually quite easy in this scheme, it seems, relying basically on the Coulomb interaction, mediated, of course, by Debye screened plasmons. The fact that two qubit gates are so simple is certainly one of the reasons why this paper was accepted into Physical Review Letters. Usually getting two qubits to talk to each other is like getting a cat to think its not the center of the universe. From the paper<\/p>\n

Two qubit interactions mediated by plasmons offer a new sort of protection for faulty quantum operations. By taking advantage of the local, non-topological, properties of these states, we can remove the detrimental effects of decoherence, and cause quantum states to spontaneously recohere.<\/p><\/blockquote>\n

This proposal, of course, is a radical way to build a quantum computer. Normally, we think about quantum computers as requiring very cold, pure, quantum states. Since the technical requirements for this traditional approach to building a quantum computer are so insurmountable, it is often remarked by those less than qualified to do so that quantum computers will probably be built sometime around 2060. But, using the same technology that will fuel a future fusion reactor, it now seems to me that this number is not so far away at all. Indeed, the authors claim that this method of building a quantum computer will suffer from none of the benefits that merit fusion research, and thus, we can expect a quantum computer around the same time that we engineer a fusion reactor. How’s that for an optimistic prediction for quantum computers!
\nFree energy and free quantum computation for everyone, my friends!<\/p>\n","protected":false},"excerpt":{"rendered":"

Normally when I think about quantum computers, I think about systems which are pretty cold, since a thermal equilibrium state at high temperature is a very mixed state. But is it really true that a quantum computer needs to be cold to quantum compute? I’ve often wondered (some would say pontificated) about this, and so … <\/p>\n

Continue reading “Hot Quantum Computing!”<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","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":[65],"tags":[],"class_list":["post-1891","post","type-post","status-publish","format-standard","hentry","category-quantum-computing"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/dabacon.org\/pontiff\/wp-json\/wp\/v2\/posts\/1891","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=1891"}],"version-history":[{"count":0,"href":"https:\/\/dabacon.org\/pontiff\/wp-json\/wp\/v2\/posts\/1891\/revisions"}],"wp:attachment":[{"href":"https:\/\/dabacon.org\/pontiff\/wp-json\/wp\/v2\/media?parent=1891"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/dabacon.org\/pontiff\/wp-json\/wp\/v2\/categories?post=1891"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/dabacon.org\/pontiff\/wp-json\/wp\/v2\/tags?post=1891"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}