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| Autori principali: | , , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2024
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| Soggetti: | |
| Accesso online: | https://arxiv.org/abs/2405.13642 |
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| _version_ | 1866912801041154048 |
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| author | Messelot, Simon Aparicio, Nicolas de Seze, Elie Eyraud, Eric Coraux, Johann Watanabe, Kenji Taniguchi, Takashi Renard, Julien |
| author_facet | Messelot, Simon Aparicio, Nicolas de Seze, Elie Eyraud, Eric Coraux, Johann Watanabe, Kenji Taniguchi, Takashi Renard, Julien |
| contents | In a Josephson junction, the current phase relation relates the phase variation of the superconducting order parameter, $φ$, between the two superconducting leads connected through a weak link, to the dissipationless current . This relation is the fingerprint of the junction. It is usually dominated by a $\sin(φ)$ harmonic, however its precise knowledge is necessary to design superconducting quantum circuits with tailored properties. Here, we directly measure the current phase relation of a superconducting quantum interference device made with gate-tunable graphene Josephson junctions and we show that it can behave as a $\sin(2φ)$ Josephson element, free of the traditionally dominant $\sin(φ)$ harmonic. Such element will be instrumental for the development of superconducting quantum bits protected from decoherence. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2405_13642 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Direct measurement of a $\sin(2φ)$ current phase relation in a graphene superconducting quantum interference device Messelot, Simon Aparicio, Nicolas de Seze, Elie Eyraud, Eric Coraux, Johann Watanabe, Kenji Taniguchi, Takashi Renard, Julien Mesoscale and Nanoscale Physics In a Josephson junction, the current phase relation relates the phase variation of the superconducting order parameter, $φ$, between the two superconducting leads connected through a weak link, to the dissipationless current . This relation is the fingerprint of the junction. It is usually dominated by a $\sin(φ)$ harmonic, however its precise knowledge is necessary to design superconducting quantum circuits with tailored properties. Here, we directly measure the current phase relation of a superconducting quantum interference device made with gate-tunable graphene Josephson junctions and we show that it can behave as a $\sin(2φ)$ Josephson element, free of the traditionally dominant $\sin(φ)$ harmonic. Such element will be instrumental for the development of superconducting quantum bits protected from decoherence. |
| title | Direct measurement of a $\sin(2φ)$ current phase relation in a graphene superconducting quantum interference device |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2405.13642 |