Vibration control for mechanical cryocoolers

Cao, Haishan

doi:10.1016/j.cryogenics.2022.103595

Cited by 6 publications

(2 citation statements)

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“…Our findings suggest several strategies to mitigate the mechanical sensitivity of superconducting qubits, including the use of a suspended qubit substrate with phononic crystal structures [42][43][44] and sample packages that employ both mechanical isolation and thermal conductivity 45,46 , in order to isolate superconducting qubits from mechanical vibrations. In addition, our results would emphasize the importance of vibration-free dilution refrigerators [47][48][49] in achieving long and stable coherence times in superconducting devices. Moreover, our measurement scheme revealed that superconducting qubits become out of equilibrium within a specific time window during the periodic pulse tube operation.…”

Section: Discussionmentioning

confidence: 71%

“…Although the origin of the mechanical sensitivity of long-lived superconducting qubits could not be determined unambiguously in this work, our observations are consistent with quasiparticle-and TLS-mediated qubit decays to phononic baths 40,41 . Moreover, these findings suggest future strategies for fault-tolerant superconducting quantum computing, including the development of acoustically shielded superconducting devices [42][43][44] , mechanical shock-resilient sample packaging 45,46 , and a vibration-free dilution refrigerator [47][48][49] .…”

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confidence: 99%

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Mechanically induced correlated errors on superconducting qubits with relaxation times exceeding 0.4 ms

Kono,

Pan,

Chegnizadeh

et al. 2024

Nat Commun

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Superconducting qubits are among the most advanced candidates for achieving fault-tolerant quantum computing. Despite recent significant advancements in the qubit lifetimes, the origin of the loss mechanism for state-of-the-art qubits is still subject to investigation. Furthermore, the successful implementation of quantum error correction requires negligible correlated errors between qubits. Here, we realize long-lived superconducting transmon qubits that exhibit fluctuating lifetimes, averaging 0.2 ms and exceeding 0.4 ms – corresponding to quality factors above 5 million and 10 million, respectively. We then investigate their dominant error mechanism. By introducing novel time-resolved error measurements that are synchronized with the operation of the pulse tube cooler in a dilution refrigerator, we find that mechanical vibrations from the pulse tube induce nonequilibrium dynamics in highly coherent qubits, leading to their correlated bit-flip errors. Our findings not only deepen our understanding of the qubit error mechanisms but also provide valuable insights into potential error-mitigation strategies for achieving fault tolerance by decoupling superconducting qubits from their mechanical environments.

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