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| Main Authors: | , , , , , , , |
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| Format: | Preprint |
| Published: |
2025
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2510.01557 |
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| _version_ | 1866914242098102272 |
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| author | Hartsell, D. M. Gray, J. M. Shappert, C. M. Gostin, N. L. McGill, R. A. Tinkey, H. N. Clark, C. R. Brown, K. R. |
| author_facet | Hartsell, D. M. Gray, J. M. Shappert, C. M. Gostin, N. L. McGill, R. A. Tinkey, H. N. Clark, C. R. Brown, K. R. |
| contents | We present the design and characterization of a cryogenic vacuum chamber incorporating mechanical isolation from vibrations, a high numerical-aperture in-vacuum imaging objective, in-vacuum magnetic shielding, and an antenna for global radio-frequency manipulation of trapped ions. The cold shield near 4 K is mechanically referenced to an underlying optical table via thermally insulating supports and exhibits root-mean-square vibrations less than 7.61(4) nm. Using the in-vacuum objective, we can detect 397 nm photons from a trapped $^{40}\mathrm{Ca}^{+}$ ion with 1.77% efficiency and achieve 99.9963(4)% single-shot state-detection fidelity in 50 $μ$s. To characterize the efficacy of the magnetic shields, we perform Ramsey experiments on the ground state qubit and obtain a coherence time of 24(2) ms, which extends to 0.25(1) s with a single spin-echo pulse. XY4 and XY32 dynamical decoupling sequences driven via the radio-frequency antenna extend the coherence to 0.72(2) s and 0.81(3) s, respectively. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2510_01557 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Design and characterization of a cryogenic vacuum chamber for ion trapping experiments Hartsell, D. M. Gray, J. M. Shappert, C. M. Gostin, N. L. McGill, R. A. Tinkey, H. N. Clark, C. R. Brown, K. R. Quantum Physics We present the design and characterization of a cryogenic vacuum chamber incorporating mechanical isolation from vibrations, a high numerical-aperture in-vacuum imaging objective, in-vacuum magnetic shielding, and an antenna for global radio-frequency manipulation of trapped ions. The cold shield near 4 K is mechanically referenced to an underlying optical table via thermally insulating supports and exhibits root-mean-square vibrations less than 7.61(4) nm. Using the in-vacuum objective, we can detect 397 nm photons from a trapped $^{40}\mathrm{Ca}^{+}$ ion with 1.77% efficiency and achieve 99.9963(4)% single-shot state-detection fidelity in 50 $μ$s. To characterize the efficacy of the magnetic shields, we perform Ramsey experiments on the ground state qubit and obtain a coherence time of 24(2) ms, which extends to 0.25(1) s with a single spin-echo pulse. XY4 and XY32 dynamical decoupling sequences driven via the radio-frequency antenna extend the coherence to 0.72(2) s and 0.81(3) s, respectively. |
| title | Design and characterization of a cryogenic vacuum chamber for ion trapping experiments |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2510.01557 |