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| Main Authors: | , , , , , , , |
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| Format: | Preprint |
| Published: |
2026
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2603.13726 |
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| _version_ | 1866910052805246976 |
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| author | Sprave, Isabelle V. Dütz, Denny Kock, Sebastian Otten, René Hangleiter, Tobias Mende, Felix Wislicenus, Marcus Bluhm, Hendrik |
| author_facet | Sprave, Isabelle V. Dütz, Denny Kock, Sebastian Otten, René Hangleiter, Tobias Mende, Felix Wislicenus, Marcus Bluhm, Hendrik |
| contents | Scaling solid-state architectures to the millions of qubits required for utility-scale quantum computing could benefit from the integration of control electronics in the immediate vicinity of the quantum layer. However, lithographically fabricated solid-state qubits perform best at temperatures well below 1 K, where available cooling power is limited, whereas the control electronics dissipate substantial power and therefore require the higher cooling power available at elevated temperatures. To address this challenge, we propose a cryopackaging concept that uses broadband phononic Distributed Bragg Reflectors (DBRs) as a thermal barrier between cryoelectronics and the qubit chip. As an experimental realization of this concept, we fabricate and characterize Ta/SiO$_2$ DBR structures. In this architecture, the DBR is intended to provide mechanical support for superconducting vias while offering substantially better thermal insulation than typical bulk materials. For a 600-nm-thick DBR consisting of 10 Ta/SiO$_2$ bilayers, we obtain a thermal conduction below 1 mW/cm$^2$ from 1.5 K to 100 mK. In a centimeter-scale architecture, this level of isolation is compatible with Watt-level cooling power for nearby electronics while maintaining a qubit temperature around 100 mK in commercially available dilution refrigerators. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2603_13726 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Phononic Bragg Reflectors for Thermal Insulation of Scalable Cryogenic Control Electronics from Qubits Sprave, Isabelle V. Dütz, Denny Kock, Sebastian Otten, René Hangleiter, Tobias Mende, Felix Wislicenus, Marcus Bluhm, Hendrik Quantum Physics Applied Physics Scaling solid-state architectures to the millions of qubits required for utility-scale quantum computing could benefit from the integration of control electronics in the immediate vicinity of the quantum layer. However, lithographically fabricated solid-state qubits perform best at temperatures well below 1 K, where available cooling power is limited, whereas the control electronics dissipate substantial power and therefore require the higher cooling power available at elevated temperatures. To address this challenge, we propose a cryopackaging concept that uses broadband phononic Distributed Bragg Reflectors (DBRs) as a thermal barrier between cryoelectronics and the qubit chip. As an experimental realization of this concept, we fabricate and characterize Ta/SiO$_2$ DBR structures. In this architecture, the DBR is intended to provide mechanical support for superconducting vias while offering substantially better thermal insulation than typical bulk materials. For a 600-nm-thick DBR consisting of 10 Ta/SiO$_2$ bilayers, we obtain a thermal conduction below 1 mW/cm$^2$ from 1.5 K to 100 mK. In a centimeter-scale architecture, this level of isolation is compatible with Watt-level cooling power for nearby electronics while maintaining a qubit temperature around 100 mK in commercially available dilution refrigerators. |
| title | Phononic Bragg Reflectors for Thermal Insulation of Scalable Cryogenic Control Electronics from Qubits |
| topic | Quantum Physics Applied Physics |
| url | https://arxiv.org/abs/2603.13726 |