Multi-ion Frequency Reference Using Dynamical Decoupling

authored by: Lennart Pelzer, Kai Dietze, Víctor José Martínez-Lahuerta, Ludwig Krinner, Johannes Kramer, Fabian Dawel, Nicolas C.H. Spethmann, Klemens Hammerer, Piet O. Schmidt
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.
Organisation(s): Institute of Quantum Optics
Institute of Theoretical Physics
External Organisation(s): National Metrology Institute of Germany (PTB)
Type: Article
Journal: Physical review letters
Volume: 133
ISSN: 0031-9007
Publication date: 19.07.2024
Publication status: Published
Peer reviewed: Yes
ASJC Scopus subject areas: Physics and Astronomy(all)
Electronic version(s): https://doi.org/10.48550/arXiv.2311.13736 (Access: Open)
https://doi.org/10.1103/PhysRevLett.133.033203 (Access: Open)

BibTeX

@article{ce629e5ef5c34bbfaeb75c98e1076583,
title = "Multi-ion Frequency Reference Using Dynamical Decoupling",
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.",
author = "Lennart Pelzer and Kai Dietze and Mart{\'i}nez-Lahuerta, {V{\'i}ctor Jos{\'e}} and Ludwig Krinner and Johannes Kramer and Fabian Dawel and Spethmann, {Nicolas C.H.} and Klemens Hammerer and Schmidt, {Piet O.}",
year = "2024",
month = jul,
day = "19",
doi = "10.48550/arXiv.2311.13736",
language = "English",
volume = "133",
journal = "Physical review letters",
issn = "0031-9007",
publisher = "American Physical Society",
number = "3",
}