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Stephan Rachel

As seen in: MSN, Nature, WIRED Magazine, The Conversation, Flipboard, The Astronomical Journal, ScienceAlert, Physical Review B, AllEvents, ZME Science and
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Articles

Robustness of Majorana modes to a disorder potential in atomic chains on a superconducting Rashba alloy

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By Harim Jang, Daniel Crawford, Lucas Schneider, Jens Wiebe, Makoto Shimizu, Harald O. Jeschke, Stephan Rachel, Roland Wiesendanger
| Nature Verified
Abstract Majorana modes offer great potential for fault-tolerant quantum computation due to their topological protection. However, intrinsic disorder makes the unambiguous detection of Majorana modes difficult in the commonly used hybrid superconductor–semiconductor nanowire platform. By contrast, for magnet–superconductor hybrid systems, Majorana modes were theoretically predicted to be very robust against disorder, but no experimental confirmation of this has been reported so far.
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Fractionalized Superconductivity Mediated by Majorana Fermions in the Kitaev-Kondo Lattice

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By RWTH Aachen, Urban F.P. Seifert, Stephan Rachel, Matthew Bunney
| tu-dresden.de
Superconductivity usually emerges from a metallic normal state which follows the Fermi-liquid paradigm. If, in contrast, the normal state is a fractionalized non-Fermi liquid, then pairing may either eliminate fractionalization via a Higgs-type mechanism leading to a conventional superconducting state, or pairing can occur in the presence of fractionalization.
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マイクロソフトの新型チップ「Majorana 1」、量子物理学者が解説するその可能性

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By Stephan Rachel
| Wired Japan Verified
※本記事はクリエイティブ・コモンズのライセンスの下、『The Conversation』に当初掲載されたものである。 マイクロソフトの研究者らが、エキゾチックな物質状態で情報を保存するデバイスにおいて、初の「トポロジカル量子ビット」の作成に成功したと発表した。この成果は量子コンピューティング分野における画期的な進展となる可能性がある。 同社の研究者らは、今回の成果を『Nature』に論文として掲載するとともに、今後の「ロードマップ」も公開した。「Majorana 1」プロセッサーの設計では、最大100万量子ビットが搭載可能とされており、これが実現すれば、暗号解読や新薬・新材料の迅速な設計など、量子コンピューティングの多くの重要な目標を達成できる可能性がある。 マイクロソフトの主張が実証されれば、同社は現在量子コンピューターの開発競争をリードしていると思われるIBMやグーグルなどの競合他社を大きく引き離すことになるかもしれない。...
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