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| Auteurs principaux: | , , , , , , , , , , , , |
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| Format: | Preprint |
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2023
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| Accès en ligne: | https://arxiv.org/abs/2311.15371 |
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| _version_ | 1866909457998413824 |
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| author | Leblanc, Axel Tangchingchai, Chotivut Momtaz, Zahra Sadre Kiyooka, Elyjah Hartmann, Jean-Michel Fernandez-Bada, Gonzalo Troncoso Brun-Barriere, Boris Schmitt, Vivien Zihlmann, Simon Maurand, Romain Dumur, Étienne De Franceschi, Silvano Lefloch, François |
| author_facet | Leblanc, Axel Tangchingchai, Chotivut Momtaz, Zahra Sadre Kiyooka, Elyjah Hartmann, Jean-Michel Fernandez-Bada, Gonzalo Troncoso Brun-Barriere, Boris Schmitt, Vivien Zihlmann, Simon Maurand, Romain Dumur, Étienne De Franceschi, Silvano Lefloch, François |
| contents | Hybrid superconductor(S)-semiconductor(Sm) devices bring a range of new functionalities into superconducting circuits. In particular, hybrid parity-protected qubits and Josephson diodes were recently proposed and experimentally demonstrated. Such devices leverage the non-sinusoidal character of the Josephson current-phase relation (CPR) in highly transparent S-Sm-S junctions. Here we report an experimental study of superconducting quantum-interference devices (SQUIDs) embedding Josephson field-effect transistors fabricated from a SiGe/Ge/SiGe heterostructure grown on a 200-mm silicon wafer. The single-junction CPR shows up to three harmonics with gate tunable amplitude. In the presence of microwave irradiation, the ratio of the first two dominant harmonics, corresponding to single and double Cooper-pair transport processes, is consistently reflected in relative weight of integer and half-integer Shapiro steps. A combination of magnetic-flux and gate-voltage control enables tuning the SQUID functionality from a nonreciprocal Josephson-diode regime with 27% asymmetry to a $π$-periodic Josephson regime suitable for the implementation of parity-protected superconducting qubits. These results illustrate the potential of Ge-based hybrid devices as versatile and scalable building blocks of novel superconducting quantum circuits. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2311_15371 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | From nonreciprocal to charge-4e supercurrents in Ge-based Josephson devices with tunable harmonic content Leblanc, Axel Tangchingchai, Chotivut Momtaz, Zahra Sadre Kiyooka, Elyjah Hartmann, Jean-Michel Fernandez-Bada, Gonzalo Troncoso Brun-Barriere, Boris Schmitt, Vivien Zihlmann, Simon Maurand, Romain Dumur, Étienne De Franceschi, Silvano Lefloch, François Mesoscale and Nanoscale Physics Superconductivity Hybrid superconductor(S)-semiconductor(Sm) devices bring a range of new functionalities into superconducting circuits. In particular, hybrid parity-protected qubits and Josephson diodes were recently proposed and experimentally demonstrated. Such devices leverage the non-sinusoidal character of the Josephson current-phase relation (CPR) in highly transparent S-Sm-S junctions. Here we report an experimental study of superconducting quantum-interference devices (SQUIDs) embedding Josephson field-effect transistors fabricated from a SiGe/Ge/SiGe heterostructure grown on a 200-mm silicon wafer. The single-junction CPR shows up to three harmonics with gate tunable amplitude. In the presence of microwave irradiation, the ratio of the first two dominant harmonics, corresponding to single and double Cooper-pair transport processes, is consistently reflected in relative weight of integer and half-integer Shapiro steps. A combination of magnetic-flux and gate-voltage control enables tuning the SQUID functionality from a nonreciprocal Josephson-diode regime with 27% asymmetry to a $π$-periodic Josephson regime suitable for the implementation of parity-protected superconducting qubits. These results illustrate the potential of Ge-based hybrid devices as versatile and scalable building blocks of novel superconducting quantum circuits. |
| title | From nonreciprocal to charge-4e supercurrents in Ge-based Josephson devices with tunable harmonic content |
| topic | Mesoscale and Nanoscale Physics Superconductivity |
| url | https://arxiv.org/abs/2311.15371 |