{"id":81329,"date":"2024-11-20T13:07:45","date_gmt":"2024-11-20T12:07:45","guid":{"rendered":"https:\/\/wfa.uwr.edu.pl\/?p=81329"},"modified":"2024-11-20T13:07:51","modified_gmt":"2024-11-20T12:07:51","slug":"entanglement-of-unsynchronized-reference-systems","status":"publish","type":"post","link":"https:\/\/wfa.uwr.edu.pl\/en\/2024\/11\/20\/entanglement-of-unsynchronized-reference-systems\/","title":{"rendered":"Entanglement of unsynchronized reference systems"},"content":{"rendered":"\n<div class=\"wp-block-ugb-container ugb-container blok_nowa_podstrona ugb-8dda971 ugb-container--v2 ugb-container--design-plain ugb-main-block\"><div class=\"ugb-inner-block\"><div class=\"ugb-block-content\"><div class=\"ugb-container__wrapper ugb-8dda971-wrapper\"><div class=\"ugb-container__side\"><div class=\"ugb-container__content-wrapper ugb-8dda971-content-wrapper\">\n<div class=\"wp-block-columns bs-news-page is-layout-flex wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column bs-kontakt-photo is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"338\" height=\"225\" src=\"https:\/\/wfa.uwr.edu.pl\/wp-content\/uploads\/sites\/216\/2022\/08\/quantuum_communication-338x225-1.jpg\" alt=\"Pomiar stopnia spl\u0105tania dla niezsynchronizowanych\" class=\"wp-image-39621\" srcset=\"https:\/\/wfa.uwr.edu.pl\/wp-content\/uploads\/sites\/216\/2022\/08\/quantuum_communication-338x225-1.jpg 338w, https:\/\/wfa.uwr.edu.pl\/wp-content\/uploads\/sites\/216\/2022\/08\/quantuum_communication-338x225-1-300x200.jpg 300w, https:\/\/wfa.uwr.edu.pl\/wp-content\/uploads\/sites\/216\/2022\/08\/quantuum_communication-338x225-1-24x16.jpg 24w, https:\/\/wfa.uwr.edu.pl\/wp-content\/uploads\/sites\/216\/2022\/08\/quantuum_communication-338x225-1-36x24.jpg 36w, https:\/\/wfa.uwr.edu.pl\/wp-content\/uploads\/sites\/216\/2022\/08\/quantuum_communication-338x225-1-48x32.jpg 48w\" sizes=\"auto, (max-width: 338px) 100vw, 338px\" \/><\/figure>\n<\/div>\n\n\n\n<div class=\"wp-block-column bs-contact-right-column is-layout-flow wp-block-column-is-layout-flow\">\n<div class=\"wp-block-bonasoft-modular-breadcrumbs-block\"><div class=\"bs_add_breadcrumb_trail\"><\/div><\/div>\n\n\n\n<hr class=\"wp-block-separator has-text-color has-black-color has-css-opacity has-black-background-color has-background is-style-wide bs-border-kontakt\"\/>\n\n\n<h1 style=\"font-style:normal;font-weight:700;\" class=\"bs-naglowek-podstrony wp-block-post-title\">Entanglement of unsynchronized reference systems<\/h1>\n\n\n<p>In the recently published paper titled <em>Measuring Concurrence in Qubit Werner States Without an Aligned Reference Frame<\/em>, Phys. Rev. Applied 16, 054042 (2021), Kate\u0159ina Jir\u00e1kov\u00e1, Artur Barasi\u0144ski, Anton\u00edn \u010cernoch, Karel Lemr, and Jan Soubusta propose a method which allows quantifying the degree of quantum state entanglement using random and unknown measurement bases.<\/p>\n\n\n<div class=\"bs__links\">\r\n    <div class=\"bs__links__section\">\r\n        <ul class=\"bs__links__list\">\r\n                            <li class=\"bs__links__list__item\">\r\n                    <a href=\"https:\/\/journals.aps.org\/prapplied\/abstract\/10.1103\/PhysRevApplied.16.054042\" class=\"bs__links__list__item__link\">\r\n                        \u201eMeasuring Concurrence in Qubit Werner States Without an Aligned Reference Frame\u201d \r\n                        <div class=\"bs__links__list__item__link__before__icon\">\r\n                            <div class=\"bs__links__list__item__link__icon\">\r\n                                <svg width=\"40px\" height=\"40px\" viewBox=\"0 0 22 16\" version=\"1.1\">\r\n                                <g stroke=\"none\" strokeWidth=\"1\" fill=\"black\" fillRule=\"evenodd\">\r\n                                    <g>\r\n                                    <polygon points=\"13.4875 0 12 1.6215 18.7875 8 12 14.3795 13.4875 16 21.9995 8\" \/>\r\n                                    <\/g>\r\n                                <\/g>\r\n                                <\/svg>\r\n                            <\/div>\r\n                        <\/div>\r\n                    <\/a>\r\n                <li>\r\n                            <li class=\"bs__links__list__item\">\r\n                    <a href=\"https:\/\/wfa.uwr.edu.pl\/lista-pracownikow\/?omegaId=UWR9eddeaa3321e46dcb99c23be52c2583b\" class=\"bs__links__list__item__link\">\r\n                        dr hab. in\u017c. Artur Barasi\u0144ski \r\n                        <div class=\"bs__links__list__item__link__before__icon\">\r\n                            <div class=\"bs__links__list__item__link__icon\">\r\n                                <svg width=\"40px\" height=\"40px\" viewBox=\"0 0 22 16\" version=\"1.1\">\r\n                                <g stroke=\"none\" strokeWidth=\"1\" fill=\"black\" fillRule=\"evenodd\">\r\n                                    <g>\r\n                                    <polygon points=\"13.4875 0 12 1.6215 18.7875 8 12 14.3795 13.4875 16 21.9995 8\" \/>\r\n                                    <\/g>\r\n                                <\/g>\r\n                                <\/svg>\r\n                            <\/div>\r\n                        <\/div>\r\n                    <\/a>\r\n                <li>\r\n                    <\/ul>\r\n    <\/div>\r\n<\/div><\/div>\n<\/div>\n\n\n\n<div class=\"wp-block-ugb-container ugb-container bs-news-page-under ugb-f8694ce ugb-container--v2 ugb-container--design-plain ugb-main-block\"><div class=\"ugb-inner-block\"><div class=\"ugb-block-content\"><div class=\"ugb-container__wrapper ugb-f8694ce-wrapper\"><div class=\"ugb-container__side\"><div class=\"ugb-container__content-wrapper ugb-f8694ce-content-wrapper\">\n<p>This is how the Authors explain their work:<\/p>\n\n\n\n<p>A safe and infallible exchange of information has a great meaning in the whole world. Therefore a practical implementation of quantum information protocols beyond a scientific laboratory became one of the main fields of interest of scientists in recent years. Of course such progress in quantum communication methods requires performing quantum measurements in an unstable environment in which it is difficult to meet the strict requirements for synchronisation and calibration of remote devices. For instance, experiments on quantum communication over long distances or quantum satellite communication are usually based on quantum optical devices in which qubits are coded as light polarisation states. This however requires that the sender and receiver have a common reference system, allowing to correctly tune measuring devices. Moreover, such a system needs to be maintained in a stable way throughout the entire experiment or communication. Although maintaining a common reference system seems like a trivial assumption if it is limited to a laboratory, from the experimental point of view this requirement always entails an array of technical difficulties. For this reason, current experiments on quantum satellite communication unambiguously pointed to a necessity to reassess the validity of such an assumption.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full is-resized\"><img decoding=\"async\" src=\"https:\/\/wfa.uwr.edu.pl\/wp-content\/uploads\/sites\/216\/2022\/08\/figSetup2-298x300-1.jpeg\" alt=\"Aparatura pomiarowa: PBS\" class=\"wp-image-32707\" style=\"width:301px;height:303px\"\/><figcaption class=\"wp-element-caption\">Fig.1 Measuring equipment: PBS \u2013 polarizing beam splitter, BD \u2013 beam divider,\u00a0PC \u2013 polarization controller, \u03b2=BBO \u2013 nonlinear \u03b2=BBO crystal, D \u2013 detector, HWP \u2013 half wave plate,\u00a0QWP \u2013 quarter wave plate.<\/figcaption><\/figure>\n\n\n\n<p>In the paper <em>Measuring Concurrence in Qubit Werner States Without an Aligned Reference Frame <\/em>we propose a method which allows quantifying the degree of quantum state entanglement using random and unknown measurement bases. With such information we are able to evaluate the efficiency of the quantum communication process, and thereby correctly select a quantum communication protocol adequate to the prevailing experimental conditions.<\/p>\n\n\n\n<p>The proposed method is based on estimating the probability of nonlocal fraction as an effect of measurements performed on remote sub-systems for randomly chosen (uniformly) observables (setups). The theoretical results obtained by us were experimentally verified. For this purpose we have constructed a measurement setting presented in fig. 1, implemented on a linear optics platform where qubits are encoded as spatial and polarisation states of single photons. The obtained results fully confirm compliance with theoretical predictions (fig. 2). Thereby, our result shows that, counterintuitively, measurements at random and unknown bases can be used to determine how entangled the quantum state is.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" src=\"https:\/\/wfa.uwr.edu.pl\/wp-content\/uploads\/sites\/216\/2022\/08\/plot_merged_10-727x1024-1.jpeg\" alt=\"Zale\u017cno\u015b\u0107 prawdopodobie\u0144stwa \u0142amania lokalnego realizmu\" class=\"wp-image-32713\"\/><figcaption class=\"wp-element-caption\">Fig.2 (a) The dependence of the probability of nonlocal fraction on = ( visibility1=noise amount) and (b) the relationship between the degree of entanglement and the probability of nonlocal fraction for three-qubit Werner-type states. In both panels, symbols denote experimental measurements for two different Werner-type states denoted as \u03b8 = 35 \u25e6 (triangles) and \u03b8 = 45 \u25e6 (squares), while curves represent theoretical predictions.\u00a0<\/figcaption><\/figure>\n\n\n\n<p>Added by: Joanna Molenda-\u017bakowicz<\/p>\n\n\n\n<p>Dean&#8217;s representative for faculty promotion and media relations<\/p>\n<\/div><\/div><\/div><\/div><\/div><\/div>\n<\/div><\/div><\/div><\/div><\/div><\/div>\n","protected":false},"excerpt":{"rendered":"<p>In the recently published paper titled Measuring Concurrence in Qubit Werner States Without an Aligned Reference Frame, Phys. Rev. Applied 16, 054042 (2021), Kate\u0159ina Jir\u00e1kov\u00e1, Artur Barasi\u0144ski, Anton\u00edn \u010cernoch, Karel Lemr, and Jan Soubusta propose a method which allows quantifying the degree of quantum state entanglement using random and unknown measurement bases. This is how [&hellip;]<\/p>\n","protected":false},"author":7182,"featured_media":39621,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[389],"tags":[392],"class_list":["post-81329","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-publikacje-en","tag-publikacje-en"],"featured_image_urls_v2":{"full":["https:\/\/wfa.uwr.edu.pl\/wp-content\/uploads\/sites\/216\/2022\/08\/quantuum_communication-338x225-1.jpg",338,225,false],"thumbnail":["https:\/\/wfa.uwr.edu.pl\/wp-content\/uploads\/sites\/216\/2022\/08\/quantuum_communication-338x225-1-150x150.jpg",150,150,true],"medium":["https:\/\/wfa.uwr.edu.pl\/wp-content\/uploads\/sites\/216\/2022\/08\/quantuum_communication-338x225-1-300x200.jpg",300,200,true],"medium_large":["https:\/\/wfa.uwr.edu.pl\/wp-content\/uploads\/sites\/216\/2022\/08\/quantuum_communication-338x225-1.jpg",338,225,false],"large":["https:\/\/wfa.uwr.edu.pl\/wp-content\/uploads\/sites\/216\/2022\/08\/quantuum_communication-338x225-1.jpg",338,225,false],"1536x1536":["https:\/\/wfa.uwr.edu.pl\/wp-content\/uploads\/sites\/216\/2022\/08\/quantuum_communication-338x225-1.jpg",338,225,false],"2048x2048":["https:\/\/wfa.uwr.edu.pl\/wp-content\/uploads\/sites\/216\/2022\/08\/quantuum_communication-338x225-1.jpg",338,225,false],"menu-24x24":["https:\/\/wfa.uwr.edu.pl\/wp-content\/uploads\/sites\/216\/2022\/08\/quantuum_communication-338x225-1-24x16.jpg",24,16,true],"menu-36x36":["https:\/\/wfa.uwr.edu.pl\/wp-content\/uploads\/sites\/216\/2022\/08\/quantuum_communication-338x225-1-36x24.jpg",36,24,true],"menu-48x48":["https:\/\/wfa.uwr.edu.pl\/wp-content\/uploads\/sites\/216\/2022\/08\/quantuum_communication-338x225-1-48x32.jpg",48,32,true]},"post_excerpt_stackable_v2":"<p>Entanglement of unsynchronized reference systems In the recently published paper titled Measuring Concurrence in Qubit Werner States Without an Aligned Reference Frame, Phys. Rev. Applied 16, 054042 (2021), Kate\u0159ina Jir\u00e1kov\u00e1, Artur Barasi\u0144ski, Anton\u00edn \u010cernoch, Karel Lemr, and Jan Soubusta propose a method which allows quantifying the degree of quantum state entanglement using random and unknown measurement bases. \u201eMeasuring Concurrence in Qubit Werner States Without an Aligned Reference Frame\u201d dr hab. in\u017c. Artur Barasi\u0144ski This is how the Authors explain their work: A safe and infallible exchange of information has a great meaning in the whole world. Therefore a practical implementation&hellip;<\/p>\n","category_list_v2":"<a href=\"https:\/\/wfa.uwr.edu.pl\/en\/category\/publikacje-en\/\" rel=\"category tag\">Publications<\/a>","author_info_v2":{"name":"kswistak","url":"https:\/\/wfa.uwr.edu.pl\/en\/author\/kswistak\/"},"comments_num_v2":"0 comments","acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.1.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Entanglement of unsynchronized reference systems - Faculty of Physics and Astronomy<\/title>\n<meta name=\"description\" content=\"Wydzia\u0142 Fizyki i Astronomii\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/wfa.uwr.edu.pl\/en\/2024\/11\/20\/entanglement-of-unsynchronized-reference-systems\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Entanglement of unsynchronized reference systems - 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