{"id":91410,"date":"2019-05-29T11:23:12","date_gmt":"2019-05-29T18:23:12","guid":{"rendered":"https:\/\/lifeboat.com\/blog\/2019\/05\/on-demand-photonic-entanglement-synthesizer-2"},"modified":"2019-05-29T11:23:12","modified_gmt":"2019-05-29T18:23:12","slug":"on-demand-photonic-entanglement-synthesizer-2","status":"publish","type":"post","link":"https:\/\/lifeboat.com\/blog\/2019\/05\/on-demand-photonic-entanglement-synthesizer-2","title":{"rendered":"On-demand, photonic entanglement synthesizer"},"content":{"rendered":"<p><a class=\"aligncenter blog-photo\" href=\"https:\/\/lifeboat.com\/blog.images\/on-demand-photonic-entanglement-synthesizer2.jpg\"><\/a><\/p>\n<p>Quantum information protocols are based on a variety of <a href=\"https:\/\/phys.org\/search\/?search=quantum+entanglement&s=0\">entanglement<\/a> modes such as <a href=\"https:\/\/plato.stanford.edu\/entries\/qt-epr\/\">Einstein-Podolsky-Rosen<\/a> (EPR), <a href=\"https:\/\/link.springer.com\/chapter\/10.1007\/978-3-540-70626-7_78\">Greenberger-Horne-Zeilinger<\/a> (GHZ) and other cluster states. For on-demand preparation, these states can be realized with squeezed light sources in optics, but such experiments lack versatility as they require a variety of optical circuits to individually realize diverse states of entanglement. In a recent study, Shuntaro Takeda and colleagues at the interdisciplinary departments of Applied Physics and Engineering in Japan addressed the shortcoming by developing an on-demand entanglement synthesizer. Using the experimental setup, the physicists programmably generated entangled states from a single squeezed source of light.<\/p>\n<p>In the work, they used a loop-based circuit dynamically controlled at nanosecond time scales to process optical pulses in the time domain. The scientists generated and verified five different small-scale entangled states and a large-cluster containing more than 1000 modes in a single setup without changing the optical circuit. The circuit developed by Takeda et al. could store and release one part of the generated entangled states to function as a quantum memory. The experimental report published on <i>Science Advances<\/i>, will open a new way to build general entanglement synthesizers on-demand using a scalable quantum processor.<\/p>\n<p>Entanglement is essential for many quantum information protocols in <a href=\"https:\/\/phys.org\/search\/?search=qubit&s=0\">qubit<\/a> and <a href=\"https:\/\/phys.org\/search\/?search=continuous+variable+quantum&s=0\">continuous variable<\/a> (CV) regions, where they perform a variety of applications. For instance, the two-mode <a href=\"https:\/\/journals.aps.org\/pr\/abstract\/10.1103\/PhysRev.47.777\">Einstein-Podolsky-Rosen (EPR) state<\/a> is the most commonly used, maximally entangled state as a building block for two-party quantum communication and for quantum logic gates based <a href=\"https:\/\/science.sciencemag.org\/content\/282\/5389\/706?ijkey=5329233d58c50317e2358cf446205a9b843580e1&keytype2=tf_ipsecsha\">on quantum teleportation<\/a>. The generalized version of this state is an n-mode <a href=\"https:\/\/www.ncbi.nlm.nih.gov\/pubmed\/11019120?dopt=Abstract\">Greenberger-Horne-Zeilinger (GHZ) state<\/a> central to building a quantum network, where the GHZ quantum state can be shared between n participants. For example, the n participants can <a href=\"https:\/\/journals.aps.org\/pra\/abstract\/10.1103\/PhysRevA.59.1829\">communicate with each other<\/a> for quantum secret sharing. For <a href=\"https:\/\/www.sciencedirect.com\/science\/article\/pii\/S0004370209001398\">quantum computation<\/a> on the other hand, a special type of entanglement known as <a href=\"https:\/\/arxiv.org\/abs\/quant-ph\/0504097\">cluster states<\/a> <a> has attracted much attention as a universal resource to allow<\/a> <a href=\"https:\/\/www.ncbi.nlm.nih.gov\/pubmed\/11384453?dopt=Abstract\">one-way quantum computation<\/a>.<\/p>\n<p><a href=\"https:\/\/phys.org\/news\/2019-05-on-demand-photonic-entanglement.html\" target=\"_blank\" rel=\"noopener noreferrer\"><\/p>\n<div style=\"clear:both;\">Read more<\/div>\n<p><\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Quantum information protocols are based on a variety of entanglement modes such as Einstein-Podolsky-Rosen (EPR), Greenberger-Horne-Zeilinger (GHZ) and other cluster states. For on-demand preparation, these states can be realized with squeezed light sources in optics, but such experiments lack versatility as they require a variety of optical circuits to individually realize diverse states of entanglement. [\u2026]<\/p>\n","protected":false},"author":396,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[38,1617],"tags":[],"class_list":["post-91410","post","type-post","status-publish","format-standard","hentry","category-engineering","category-quantum-physics"],"_links":{"self":[{"href":"https:\/\/lifeboat.com\/blog\/wp-json\/wp\/v2\/posts\/91410","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/lifeboat.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/lifeboat.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/lifeboat.com\/blog\/wp-json\/wp\/v2\/users\/396"}],"replies":[{"embeddable":true,"href":"https:\/\/lifeboat.com\/blog\/wp-json\/wp\/v2\/comments?post=91410"}],"version-history":[{"count":0,"href":"https:\/\/lifeboat.com\/blog\/wp-json\/wp\/v2\/posts\/91410\/revisions"}],"wp:attachment":[{"href":"https:\/\/lifeboat.com\/blog\/wp-json\/wp\/v2\/media?parent=91410"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/lifeboat.com\/blog\/wp-json\/wp\/v2\/categories?post=91410"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/lifeboat.com\/blog\/wp-json\/wp\/v2\/tags?post=91410"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}