Rhenium as a material platform for long-lived transmon qubits
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arXiv
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| Main Authors: | , , , , |
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| Format: | Preprint |
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2026
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| _version_ | 1866910049613381632 |
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| author | Wang, Yanhao Ganjam, Suhas Narra, Ishan Frunzio, Luigi Schoelkopf, Robert J. |
| author_facet | Wang, Yanhao Ganjam, Suhas Narra, Ishan Frunzio, Luigi Schoelkopf, Robert J. |
| contents | Dielectric loss at the interfaces of superconducting films has long been recognized as limiting the performance of state-of-the-art superconducting circuits. Notably, the presence of a native oxide layer on the film is hypothesized to contribute to dielectric loss at the metal-air interface. Here, we explore rhenium as a candidate for the film, motivated by its remarkable property to suppress native oxide formation. We demonstrate rhenium on sapphire as a promising material platform for superconducting circuits through the realization of transmons with mean relaxation times $T_1$ up to 407 microseconds at 5 GHz. Our transmons are supplemented with a loss characterization study, in which we separate the dominant loss mechanisms and construct a loss budget that agrees with our $T_1$ measurements. Further characterization may establish rhenium as a leading candidate for maximizing decoherence time. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2603_11188 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Rhenium as a material platform for long-lived transmon qubits Wang, Yanhao Ganjam, Suhas Narra, Ishan Frunzio, Luigi Schoelkopf, Robert J. Quantum Physics Dielectric loss at the interfaces of superconducting films has long been recognized as limiting the performance of state-of-the-art superconducting circuits. Notably, the presence of a native oxide layer on the film is hypothesized to contribute to dielectric loss at the metal-air interface. Here, we explore rhenium as a candidate for the film, motivated by its remarkable property to suppress native oxide formation. We demonstrate rhenium on sapphire as a promising material platform for superconducting circuits through the realization of transmons with mean relaxation times $T_1$ up to 407 microseconds at 5 GHz. Our transmons are supplemented with a loss characterization study, in which we separate the dominant loss mechanisms and construct a loss budget that agrees with our $T_1$ measurements. Further characterization may establish rhenium as a leading candidate for maximizing decoherence time. |
| title | Rhenium as a material platform for long-lived transmon qubits |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2603.11188 |