A cryogenic radio-frequency ion trap for quantum logic spectroscopy of highly charged ions

authored by: T. Leopold, S. A. King, P. Micke, A. Bautista-Salvador, J. C. Heip, C. Ospelkaus, J. R. Crespo López-Urrutia, P. O. Schmidt
Abstract: A cryogenic radio-frequency ion trap system designed for quantum logic spectroscopy of highly charged ions (HCI) is presented. It includes a segmented linear Paul trap, an in-vacuum imaging lens, and a helical resonator. We demonstrate ground state cooling of all three modes of motion of a single ⁹Be⁺ ion and determine their heating rates as well as excess axial micromotion. The trap shows one of the lowest levels of electric field noise published to date. We investigate the magnetic-field noise suppression in cryogenic shields made from segmented copper, the resulting magnetic field stability at the ion position and the resulting coherence time. Using this trap in conjunction with an electron beam ion trap and a deceleration beamline, we have been able to trap single highly charged Ar¹³⁺ (Ar XIV) ions concurrently with single Be⁺ ions, a key prerequisite for the first quantum logic spectroscopy of a HCI. This major stepping stone allows us to push highly-charged-ion spectroscopic precision from the gigahertz to the hertz level and below.
Organisation(s): Institute of Quantum Optics
CRC 1227 Designed Quantum States of Matter (DQ-mat)
External Organisation(s): National Metrology Institute of Germany (PTB)
Max Planck Institute for Nuclear Physics
Type: Article
Journal: Review of scientific instruments
Volume: 90
ISSN: 0034-6748
Publication date: 07.2019
Publication status: Published
Peer reviewed: Yes
ASJC Scopus subject areas: Instrumentation
Electronic version(s): https://doi.org/10.1063/1.5100594 (Access: Open)

BibTeX

@article{8c8a1ff704d441f9a943ea3552d8f061,
title = "A cryogenic radio-frequency ion trap for quantum logic spectroscopy of highly charged ions",
abstract = "A cryogenic radio-frequency ion trap system designed for quantum logic spectroscopy of highly charged ions (HCI) is presented. It includes a segmented linear Paul trap, an in-vacuum imaging lens, and a helical resonator. We demonstrate ground state cooling of all three modes of motion of a single 9Be+ ion and determine their heating rates as well as excess axial micromotion. The trap shows one of the lowest levels of electric field noise published to date. We investigate the magnetic-field noise suppression in cryogenic shields made from segmented copper, the resulting magnetic field stability at the ion position and the resulting coherence time. Using this trap in conjunction with an electron beam ion trap and a deceleration beamline, we have been able to trap single highly charged Ar13+ (Ar XIV) ions concurrently with single Be+ ions, a key prerequisite for the first quantum logic spectroscopy of a HCI. This major stepping stone allows us to push highly-charged-ion spectroscopic precision from the gigahertz to the hertz level and below.",
author = "T. Leopold and King, {S. A.} and P. Micke and A. Bautista-Salvador and Heip, {J. C.} and C. Ospelkaus and {Crespo L{\'o}pez-Urrutia}, {J. R.} and Schmidt, {P. O.}",
note = "Funding information: The authors gratefully thank Julia Fenske for the design and manufacturing of the electronics required for operation of the trap. We acknowledge the PTB scientific instrumentation department 5.5 headed by Frank L{\"o}ffler for their expertise and fabrication of numerous parts, including the cryogenic environment; in particular, we thank Michael M{\"u}ller and Stephan Metschke. We thank the PTB surface technology laboratory and Manuel Stompe from IMPT Hannover for their technical help with manufacturing of the ion trap. We thank the MPIK mechanical apprentice workshop headed by Stefan Flicker for fabrication of parts. Financial support was provided by Physikalisch-Technische Bundesanstalt, Max-Planck-Gesellschaft zur F{\"o}rderung der Wissenschaften e. V., and Deutsche Forschungsgemeinschaft through Grant No. SCHM2678/5-1, and Collaborative Research Centers{\textquoteright} Grant No. SFB 1227 (DQ-mat), Project Nos. A01 and B05, as well as Grant No. SFB 1225 (ISO-QUANT), Project No. B01. S.A.K. acknowledges support by the Alexander von Humboldt Foundation. This project has received funding from the European Metrology Programme for Innovation and Research (EMPIR) co-financed by the participating states and from the European Union{\textquoteright}s Horizon 2020 research and innovation programme (Project No. 17FUN07 CC4C).",
year = "2019",
month = jul,
doi = "10.1063/1.5100594",
language = "English",
volume = "90",
journal = "Review of scientific instruments",
issn = "0034-6748",
publisher = "American Institute of Physics",
number = "7",
}