Multi-ion frequency reference using dynamical decoupling

• URL: http://arxiv.org/abs/2311.13736v1
• Date: Wed, 22 Nov 2023 23:46:17 GMT
• Title: Multi-ion frequency reference using dynamical decoupling
• Authors: Lennart Pelzer (1), Kai Dietze (1 and 2), V\'ictor J. Mart\'inez-Lahuerta (3 and 2), Ludwig Krinner (1 and 2), Johannes Kramer (1 and 2), Fabian Dawel (1 and 2), Nicolas C. H. Spethmann (1), Klemens Hammerer (3), Piet O. Schmidt (1 and 2) ((1) Physikalisch-Technische Bundesanstalt, (2) Institut f\"ur Quantenoptik, Leibniz Universit\"at Hannover, (3) Institut f\"ur Theoretische Physik, Leibniz Universit\"at Hannover)
• Abstract summary: We present a continuous dynamical decoupling scheme which suppresses leading frequency shifts in a multi-ion frequency reference based on $40mathrmCa+$. The technique may find applications in quantum computing and simulation with trapped ions by a tailored design of decoherence-free subspaces.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• 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 $^{40}\mathrm{Ca}^+$. By near-resonant magnetic coupling of the $^2\mathrm{S}_{1/2}$ and $^2\mathrm{D}_{5/2}$ Zeeman sub-levels 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 2\textsuperscript{nd}-rank tensor shifts, such as the electric quadrupole shift. Suppression of the quadratic dependence of the quadrupole shift to $3(2)\,\text{mHz}/\mu m^2$ and coherence times of $290(20)\,\text{ms}$ 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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