Protected Symmetrical Superconducting Qubit Based on Quantum Flux Parametron
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arXiv
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| Main Authors: | , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866910937327337472 |
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| author | Sajedi, Kian Rafati Choubi, Mojtaba Hosseinpour Fardmanesh, Mehdi |
| author_facet | Sajedi, Kian Rafati Choubi, Mojtaba Hosseinpour Fardmanesh, Mehdi |
| contents | Conventional Quantum Flux Parametrons (QFPs) have historically been used for storing classical bits in Josephson junction-based computers. In this work, we propose a novel QFP-based topology dubbed "Degenerium" qubit, to process and compute quantum information. Degenerium combines principles from the 0-$π$ qubit and flux qubit to create ideally degenerate quantum ground states, while significantly simplifying the 0-$π$ qubit structure. The symmetrical design of Degenerium enables easier qubit control and fabrication. We demonstrate that due to the inherent symmetry of Degenerium, our designed qubit is insensitive to fabrication-induced variations in critical current ($I_c$) of the Josephson junctions. Our calculations of depolarization and dephasing rates due to charge, flux, and critical current noise sources result in depolarization and dephasing times of 1.25 s and 90 $μ$s, respectively. Further parameter tuning and optimization is possible to meet specific application demands. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2505_06593 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Protected Symmetrical Superconducting Qubit Based on Quantum Flux Parametron Sajedi, Kian Rafati Choubi, Mojtaba Hosseinpour Fardmanesh, Mehdi Superconductivity Conventional Quantum Flux Parametrons (QFPs) have historically been used for storing classical bits in Josephson junction-based computers. In this work, we propose a novel QFP-based topology dubbed "Degenerium" qubit, to process and compute quantum information. Degenerium combines principles from the 0-$π$ qubit and flux qubit to create ideally degenerate quantum ground states, while significantly simplifying the 0-$π$ qubit structure. The symmetrical design of Degenerium enables easier qubit control and fabrication. We demonstrate that due to the inherent symmetry of Degenerium, our designed qubit is insensitive to fabrication-induced variations in critical current ($I_c$) of the Josephson junctions. Our calculations of depolarization and dephasing rates due to charge, flux, and critical current noise sources result in depolarization and dephasing times of 1.25 s and 90 $μ$s, respectively. Further parameter tuning and optimization is possible to meet specific application demands. |
| title | Protected Symmetrical Superconducting Qubit Based on Quantum Flux Parametron |
| topic | Superconductivity |
| url | https://arxiv.org/abs/2505.06593 |