Multi-ion Frequency Reference Using Dynamical Decoupling

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Original languageEnglish
Article number033203
JournalPhysical review letters
Volume133
Issue number3
Publication statusPublished - 19 Jul 2024

Abstract

We present the experimental realization of a continuous dynamical decoupling scheme which suppresses leading frequency shifts in a multi-ion frequency reference based on Ca+40. By near-resonant magnetic coupling of the S21/2 and D25/2 Zeeman sublevels using radio-frequency dressing fields, engineered transitions with reduced sensitivity to magnetic-field fluctuations are obtained. A second stage detuned dressing field reduces the influence of amplitude noise in the first stage driving fields and decreases 2nd-rank tensor shifts, such as the electric quadrupole shift. Suppression of the quadratic dependence of the quadrupole shift to 3(2) mHz/μm2 and coherence times of 290(20) ms on the optical transition are demonstrated even within a laboratory environment with significant magnetic field noise. Besides removing inhomogeneous line shifts in multi-ion clocks, the demonstrated dynamical decoupling technique may find applications in quantum computing and simulation with trapped ions by a tailored design of decoherence-free subspaces.

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Multi-ion Frequency Reference Using Dynamical Decoupling. / Pelzer, Lennart; Dietze, Kai; Martínez-Lahuerta, Víctor José et al.
In: Physical review letters, Vol. 133, No. 3, 033203, 19.07.2024.

Research output: Contribution to journalArticleResearchpeer review

Pelzer, L, Dietze, K, Martínez-Lahuerta, VJ, Krinner, L, Kramer, J, Dawel, F, Spethmann, NCH, Hammerer, K & Schmidt, PO 2024, 'Multi-ion Frequency Reference Using Dynamical Decoupling', Physical review letters, vol. 133, no. 3, 033203. https://doi.org/10.48550/arXiv.2311.13736, https://doi.org/10.1103/PhysRevLett.133.033203
Pelzer, L., Dietze, K., Martínez-Lahuerta, V. J., Krinner, L., Kramer, J., Dawel, F., Spethmann, N. C. H., Hammerer, K., & Schmidt, P. O. (2024). Multi-ion Frequency Reference Using Dynamical Decoupling. Physical review letters, 133(3), Article 033203. https://doi.org/10.48550/arXiv.2311.13736, https://doi.org/10.1103/PhysRevLett.133.033203
Pelzer L, Dietze K, Martínez-Lahuerta VJ, Krinner L, Kramer J, Dawel F et al. Multi-ion Frequency Reference Using Dynamical Decoupling. Physical review letters. 2024 Jul 19;133(3):033203. doi: 10.48550/arXiv.2311.13736, 10.1103/PhysRevLett.133.033203
Pelzer, Lennart ; Dietze, Kai ; Martínez-Lahuerta, Víctor José et al. / Multi-ion Frequency Reference Using Dynamical Decoupling. In: Physical review letters. 2024 ; Vol. 133, No. 3.
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abstract = "We present the experimental realization of a continuous dynamical decoupling scheme which suppresses leading frequency shifts in a multi-ion frequency reference based on Ca+40. By near-resonant magnetic coupling of the S21/2 and D25/2 Zeeman sublevels using radio-frequency dressing fields, engineered transitions with reduced sensitivity to magnetic-field fluctuations are obtained. A second stage detuned dressing field reduces the influence of amplitude noise in the first stage driving fields and decreases 2nd-rank tensor shifts, such as the electric quadrupole shift. Suppression of the quadratic dependence of the quadrupole shift to 3(2) mHz/μm2 and coherence times of 290(20) ms on the optical transition are demonstrated even within a laboratory environment with significant magnetic field noise. Besides removing inhomogeneous line shifts in multi-ion clocks, the demonstrated dynamical decoupling technique may find applications in quantum computing and simulation with trapped ions by a tailored design of decoherence-free subspaces.",
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AU - Pelzer, Lennart

AU - Dietze, Kai

AU - Martínez-Lahuerta, Víctor José

AU - Krinner, Ludwig

AU - Kramer, Johannes

AU - Dawel, Fabian

AU - Spethmann, Nicolas C.H.

AU - Hammerer, Klemens

AU - Schmidt, Piet O.

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