{"id":1784,"date":"2022-03-07T23:56:32","date_gmt":"2022-03-07T22:56:32","guid":{"rendered":"https:\/\/wp.icmm.csic.es\/npqsic\/?p=1784"},"modified":"2022-09-27T16:08:41","modified_gmt":"2022-09-27T14:08:41","slug":"seminar-hole-spin-qubits-in-elongated-quantum-dots","status":"publish","type":"post","link":"https:\/\/wp.icmm.csic.es\/npqsic\/seminar-hole-spin-qubits-in-elongated-quantum-dots\/","title":{"rendered":"Seminar: \u00abHole spin qubits in elongated quantum dots\u00bb"},"content":{"rendered":"<p><span style=\"color: #cf6766\"><strong>M\u00f3nica Benito<\/strong><\/span><strong>,<\/strong> from the Institute of Quantum Technologies,&nbsp;German Aerospace Center&nbsp;(DLR), Ulm, will give a seminar entitled <strong><span style=\"color: #8eaebd\">\u00abHole spin qubits in elongated quantum dots\u00bb<\/span><\/strong>.<\/p>\n<p><strong>Date: March 9th, 2022, 11:00 h. <\/strong><\/p>\n<p><strong>Location<\/strong>: Instituto de Ciencia de Materiales de Madrid (ICMM-CSIC)<\/p>\n<p><strong>Abstract<\/strong>: Rapid development has positioned quantum wells in planar germanium heterostructures at the head of semiconductor quantum dot platforms for quantum information processing [1,2]. We find nuclear-spin-free isotopes, low charge noise and low disorder. The focus is on hole states, due to the absence of valley states, a technically advantageous low effective mass, and the strong spin-orbit coupling that allows for all-electric operation. These works employ heavy-hole spin qubits, which constitute the ground states in these planar devices. Theory predicts an even more promising future for germanium and\/or silicon based quantum dots fabricated in nanowires, based on tunable and even stronger spin-orbit coupling relying on the high degree of heavy-light hole mixtures [3]. I will present recent theoretical efforts to understand and experimentally identify the low-energy physics of hole germanium nanowires, including the effect of orbital effects of the magnetic field [4]. We predict optimal qubit operation at a sweet spot with Rabi frequencies in the GHz regime. We find that they can present strong and tunable spin-orbit coupling if the confinement potential is properly squeezed [5]. This confinement-induced spin-orbit coupling, and therefore the qubit-resonator coupling, could be turned on and off, overcoming present scalability challenges.<br \/>\n[1] Hendrickx et al., Nature 591, 580 (2021)<br \/>\n[2] F. van Riggelen, et al., arXiv:2202.11530<br \/>\n[3] C. Kloeffel, et al., Phys. Rev. B 84, 195314 (2011)<br \/>\n[4] C. Adelsberger, M. Benito, S. Bosco, J. Klinovaja, and D. Loss, PRB 105, 075308 (2022)<br \/>\n[5] S. Bosco, M. Benito, C. Adelsberger, and D. Loss, PRB 104, 115425 (2021)<\/p>\n","protected":false},"excerpt":{"rendered":"<p>M\u00f3nica Benito, from the Institute of Quantum Technologies,&nbsp;German Aerospace Center&nbsp;(DLR), Ulm, will give a seminar entitled \u00abHole spin qubits in elongated quantum dots\u00bb. Date: March 9th, 2022, 11:00 h. Location: Instituto de Ciencia de Materiales de Madrid (ICMM-CSIC) Abstract: Rapid development has positioned quantum wells in planar germanium heterostructures at&#8230;<\/p>\n<p class=\"continue-reading-button\"> <a class=\"continue-reading-link\" href=\"https:\/\/wp.icmm.csic.es\/npqsic\/seminar-hole-spin-qubits-in-elongated-quantum-dots\/\">Continue reading<i class=\"crycon-right-dir\"><\/i><\/a><\/p>\n","protected":false},"author":36,"featured_media":1788,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"ngg_post_thumbnail":0,"footnotes":""},"categories":[23],"tags":[],"class_list":["post-1784","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-other-activities"],"_links":{"self":[{"href":"https:\/\/wp.icmm.csic.es\/npqsic\/wp-json\/wp\/v2\/posts\/1784","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/wp.icmm.csic.es\/npqsic\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/wp.icmm.csic.es\/npqsic\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/wp.icmm.csic.es\/npqsic\/wp-json\/wp\/v2\/users\/36"}],"replies":[{"embeddable":true,"href":"https:\/\/wp.icmm.csic.es\/npqsic\/wp-json\/wp\/v2\/comments?post=1784"}],"version-history":[{"count":2,"href":"https:\/\/wp.icmm.csic.es\/npqsic\/wp-json\/wp\/v2\/posts\/1784\/revisions"}],"predecessor-version":[{"id":1790,"href":"https:\/\/wp.icmm.csic.es\/npqsic\/wp-json\/wp\/v2\/posts\/1784\/revisions\/1790"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/wp.icmm.csic.es\/npqsic\/wp-json\/wp\/v2\/media\/1788"}],"wp:attachment":[{"href":"https:\/\/wp.icmm.csic.es\/npqsic\/wp-json\/wp\/v2\/media?parent=1784"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/wp.icmm.csic.es\/npqsic\/wp-json\/wp\/v2\/categories?post=1784"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/wp.icmm.csic.es\/npqsic\/wp-json\/wp\/v2\/tags?post=1784"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}