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| Autores principales: | , , , , , , , , , , , , , |
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| Formato: | Preprint |
| Publicado: |
2024
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| Materias: | |
| Acceso en línea: | https://arxiv.org/abs/2405.14695 |
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| _version_ | 1866909225111781376 |
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| author | Leblanc, Axel Tangchingchai, Chotivut Momtaz, Zahra Sadre Kiyooka, Elyjah Hartmann, Jean-Michel Gustavo, Frederic Thomassin, Jean-Luc Brun, Boris Schmitt, Vivien Zihlmann, Simon Maurand, Romain Dumur, Etienne De Franceschi, Silvano Lefloch, Francois |
| author_facet | Leblanc, Axel Tangchingchai, Chotivut Momtaz, Zahra Sadre Kiyooka, Elyjah Hartmann, Jean-Michel Gustavo, Frederic Thomassin, Jean-Luc Brun, Boris Schmitt, Vivien Zihlmann, Simon Maurand, Romain Dumur, Etienne De Franceschi, Silvano Lefloch, Francois |
| contents | Hybrid superconductor-semiconductor Josephson field-effect transistors (JoFETs) function as Josephson junctions with a gate-tunable critical current. Additionally, they can feature a non-sinusoidal current-phase relation (CPR) containing multiple harmonics of the superconducting phase difference, a so-far underutilized property. In this work, we exploit this multi-harmonicity to create a Josephson circuit element with an almost perfectly $π$-periodic CPR, indicative of a largely dominant charge-4e supercurrent transport. Such a Josephson element was recently proposed as the basic building block of a protected superconducting qubit. Here, it is realized using a superconducting quantum interference device (SQUID) with low-inductance aluminum arms and two nominally identical JoFETs. The latter are fabricated from a SiGe/Ge/SiGe quantum-well heterostructure embedding a high-mobility two-dimensional hole gas. By carefully adjusting the JoFET gate voltages and finely tuning the magnetic flux through the SQUID close to half a flux quantum, we achieve a regime where the $\sin(2φ)$ component accounts for more than \SI{95}{\percent} of the total supercurrent. This result demonstrates a new promising route for the realization of superconducting qubits with enhanced coherence properties. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2405_14695 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Gate- and flux-tunable sin(2$φ$) Josephson element with proximitized Ge-based junctions Leblanc, Axel Tangchingchai, Chotivut Momtaz, Zahra Sadre Kiyooka, Elyjah Hartmann, Jean-Michel Gustavo, Frederic Thomassin, Jean-Luc Brun, Boris Schmitt, Vivien Zihlmann, Simon Maurand, Romain Dumur, Etienne De Franceschi, Silvano Lefloch, Francois Mesoscale and Nanoscale Physics Superconductivity Hybrid superconductor-semiconductor Josephson field-effect transistors (JoFETs) function as Josephson junctions with a gate-tunable critical current. Additionally, they can feature a non-sinusoidal current-phase relation (CPR) containing multiple harmonics of the superconducting phase difference, a so-far underutilized property. In this work, we exploit this multi-harmonicity to create a Josephson circuit element with an almost perfectly $π$-periodic CPR, indicative of a largely dominant charge-4e supercurrent transport. Such a Josephson element was recently proposed as the basic building block of a protected superconducting qubit. Here, it is realized using a superconducting quantum interference device (SQUID) with low-inductance aluminum arms and two nominally identical JoFETs. The latter are fabricated from a SiGe/Ge/SiGe quantum-well heterostructure embedding a high-mobility two-dimensional hole gas. By carefully adjusting the JoFET gate voltages and finely tuning the magnetic flux through the SQUID close to half a flux quantum, we achieve a regime where the $\sin(2φ)$ component accounts for more than \SI{95}{\percent} of the total supercurrent. This result demonstrates a new promising route for the realization of superconducting qubits with enhanced coherence properties. |
| title | Gate- and flux-tunable sin(2$φ$) Josephson element with proximitized Ge-based junctions |
| topic | Mesoscale and Nanoscale Physics Superconductivity |
| url | https://arxiv.org/abs/2405.14695 |