{"id":47537,"date":"2026-03-18T09:07:13","date_gmt":"2026-03-18T09:07:13","guid":{"rendered":"https:\/\/krea.edu.in\/sias\/?p=47537"},"modified":"2026-03-18T09:07:19","modified_gmt":"2026-03-18T09:07:19","slug":"professor-s-sivakumar-co-authors-a-journal-article-published-in-physical-review-a","status":"publish","type":"post","link":"https:\/\/krea.edu.in\/sias\/2026\/03\/18\/professor-s-sivakumar-co-authors-a-journal-article-published-in-physical-review-a\/","title":{"rendered":"Professor S Sivakumar co-authors a journal article published in Physical Review A"},"content":{"rendered":"\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-9d6595d7 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:66.66%\">\n<p>Professor S Sivakumar, Dean &#8211; Research, and Professor, Physics, SIAS, has co-authored a journal article titled Generation of large Fock states from coherent states using Kerr interaction and displacement, published in Physical Review A.<\/p>\n\n\n\n<p>Technical Abstract<\/p>\n\n\n\n<p>We discuss a scheme to generate large Fock states. The scheme involves repeatedly applying an experimentally feasible unitary transformation to convert a semiclassical state into a Fock state. The transformation combines Kerr interaction, which is a non-Gaussian operation, and pulsed coherent drives. We identify suitable parameter values (Kerr strength, pulse timings, displacement amplitude) for the physical processes to implement the transformation and generate large Fock states with near-unity fidelity. The feasibility of implementing the scheme in circuit QED architectures is discussed. The method is also suitable for generating Fock states of cavity fields.<\/p>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:33.33%\">\n<figure class=\"wp-block-image size-full\"><img fetchpriority=\"high\" decoding=\"async\" width=\"500\" height=\"500\" src=\"https:\/\/www-cdn.krea.edu.in\/sias\/2023\/05\/sivakumar-phd-23.png\" alt=\"\" class=\"wp-image-28694\" srcset=\"https:\/\/www-cdn.krea.edu.in\/sias\/2023\/05\/sivakumar-phd-23.png 500w, https:\/\/www-cdn.krea.edu.in\/sias\/2023\/05\/sivakumar-phd-23-300x300.png 300w, https:\/\/www-cdn.krea.edu.in\/sias\/2023\/05\/sivakumar-phd-23-150x150.png 150w\" sizes=\"(max-width: 500px) 100vw, 500px\" \/><\/figure>\n<\/div>\n<\/div>\n\n\n\n<p>Non-technical summary<\/p>\n\n\n\n<p>The simple harmonic oscillator is a ubiquitous model in physics, describing everything from swinging pendulums to vibrating molecules. In the quantum world, these microscopic oscillators are restricted to specific, equally spaced energy levels\u2014effectively forming a &#8220;ladder&#8221; of energy. An electromagnetic field confined in a cavity behaves exactly like a harmonic oscillator. But how do we force this field to climb the ladder and reach a specific, high-energy rung of our choice? Our work presents a new scheme that significantly outperforms known schemes for generating large photon states. Combining nonlinearity (where the output is not strictly proportional to the input) with displacement operations (essentially, &#8220;kicking&#8221; the oscillator in phase space), we can guide the system to much higher energy levels than previously possible. The paper discusses the mechanism behind this controlled ascent.<\/p>\n\n\n\n<p><strong><a href=\"https:\/\/journals.aps.org\/pra\/abstract\/10.1103\/6x7s-5696\" target=\"_blank\" rel=\"noreferrer noopener\">Read more<\/a><\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Professor S Sivakumar, Dean &#8211; Research, and Professor, Physics, SIAS, has co-authored a journal article titled Generation of large Fock states from coherent states using Kerr interaction and displacement, published in Physical Review A. Technical Abstract We discuss a scheme to generate large Fock states. The scheme involves repeatedly applying an experimentally feasible unitary transformation &hellip; <\/p>\n<p class=\"link-more\"><a href=\"https:\/\/krea.edu.in\/sias\/2026\/03\/18\/professor-s-sivakumar-co-authors-a-journal-article-published-in-physical-review-a\/\" class=\"more-link\">Continue reading<span class=\"screen-reader-text\"> &#8220;Professor S Sivakumar co-authors a journal article published in Physical Review A&#8221;<\/span><\/a><\/p>\n","protected":false},"author":10,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[189],"tags":[],"class_list":["post-47537","post","type-post","status-publish","format-standard","hentry","category-research-spotlight","entry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.3 (Yoast SEO v27.3) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Professor S Sivakumar co-authors a journal article published in Physical Review A | Krea University - Top university for liberal education<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/krea.edu.in\/sias\/2026\/03\/18\/professor-s-sivakumar-co-authors-a-journal-article-published-in-physical-review-a\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Professor S Sivakumar co-authors a journal article published in Physical Review A\" \/>\n<meta property=\"og:description\" content=\"Professor S Sivakumar, Dean &#8211; Research, and Professor, Physics, SIAS, has co-authored a journal article titled Generation of large Fock states from coherent states using Kerr interaction and displacement, published in Physical Review A. Technical Abstract We discuss a scheme to generate large Fock states. The scheme involves repeatedly applying an experimentally feasible unitary transformation &hellip; Continue reading &quot;Professor S Sivakumar co-authors a journal article published in Physical Review A&quot;\" \/>\n<meta property=\"og:url\" content=\"https:\/\/krea.edu.in\/sias\/2026\/03\/18\/professor-s-sivakumar-co-authors-a-journal-article-published-in-physical-review-a\/\" \/>\n<meta property=\"og:site_name\" content=\"Krea University - Top university for liberal education\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/KreaUniversity\/\" \/>\n<meta property=\"article:published_time\" content=\"2026-03-18T09:07:13+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-03-18T09:07:19+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www-cdn.krea.edu.in\/sias\/2023\/05\/sivakumar-phd-23.png\" \/>\n\t<meta property=\"og:image:width\" content=\"500\" \/>\n\t<meta property=\"og:image:height\" content=\"500\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"author\" content=\"Ram Kumar\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@kreauniversity\" \/>\n<meta name=\"twitter:site\" content=\"@kreauniversity\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Ram Kumar\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/krea.edu.in\\\/sias\\\/2026\\\/03\\\/18\\\/professor-s-sivakumar-co-authors-a-journal-article-published-in-physical-review-a\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/krea.edu.in\\\/sias\\\/2026\\\/03\\\/18\\\/professor-s-sivakumar-co-authors-a-journal-article-published-in-physical-review-a\\\/\"},\"author\":{\"name\":\"Ram Kumar\",\"@id\":\"https:\\\/\\\/krea.edu.in\\\/sias\\\/#\\\/schema\\\/person\\\/7ce1efda1d737e598a23d776a26a7fd5\"},\"headline\":\"Professor S Sivakumar co-authors a journal article published in Physical Review A\",\"datePublished\":\"2026-03-18T09:07:13+00:00\",\"dateModified\":\"2026-03-18T09:07:19+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/krea.edu.in\\\/sias\\\/2026\\\/03\\\/18\\\/professor-s-sivakumar-co-authors-a-journal-article-published-in-physical-review-a\\\/\"},\"wordCount\":277,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\\\/\\\/krea.edu.in\\\/sias\\\/#organization\"},\"image\":{\"@id\":\"https:\\\/\\\/krea.edu.in\\\/sias\\\/2026\\\/03\\\/18\\\/professor-s-sivakumar-co-authors-a-journal-article-published-in-physical-review-a\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www-cdn.krea.edu.in\\\/sias\\\/2023\\\/05\\\/sivakumar-phd-23.png\",\"articleSection\":[\"Research Spotlight\"],\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\\\/\\\/krea.edu.in\\\/sias\\\/2026\\\/03\\\/18\\\/professor-s-sivakumar-co-authors-a-journal-article-published-in-physical-review-a\\\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/krea.edu.in\\\/sias\\\/2026\\\/03\\\/18\\\/professor-s-sivakumar-co-authors-a-journal-article-published-in-physical-review-a\\\/\",\"url\":\"https:\\\/\\\/krea.edu.in\\\/sias\\\/2026\\\/03\\\/18\\\/professor-s-sivakumar-co-authors-a-journal-article-published-in-physical-review-a\\\/\",\"name\":\"Professor S Sivakumar co-authors a journal article published in Physical Review A | Krea University - 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