TY  - JOUR
AU  - Dijck, Elwin A.
AU  - Warnecke, Christian
AU  - Wehrheim, Malte
AU  - Henninger, Ruben B.
AU  - Eff, Julia
AU  - Georgiou, Kostas
AU  - Graf, Andrea
AU  - Kokh, Stepan
AU  - Sajith, Lakshmi P. Kozhiparambil
AU  - Mayo, Christopher
AU  - Schäfer, Vera M.
AU  - Volk, Claudia
AU  - Schmidt, Piet O.
AU  - Pfeifer, Thomas
AU  - Crespo López-Urrutia, José R.
TI  - Sympathetically cooled highly charged ions in a radio-frequency trap with superconducting magnetic shielding
JO  - Review of scientific instruments
VL  - 94
IS  - 8
SN  - 0034-6748
CY  - Melville
PB  - American Institute of Physics
M1  - PUBDB-2023-06216
M1  - arXiv:2306.01670
SP  - 083203
PY  - 2023
N1  - 16 pages, 19 figures. The following article has been submitted to Review of Scientific Instruments. After it is published, it will be found at https://rsi.aip.org/
AB  - We sympathetically cool highly charged ions (HCI) in Coulomb crystals of Doppler-cooled Be+ ions confined in a cryogenic linear Paul trap that is integrated into a fully enclosing radio-frequency resonator manufactured from superconducting niobium. By preparing a single Be+ cooling ion and a single HCI, quantum logic spectroscopy toward frequency metrology and qubit operations with a great variety of species are enabled. While cooling down the assembly through its transition temperature into the superconducting state, an applied quantization magnetic field becomes persistent, and the trap becomes shielded from subsequent external electromagnetic fluctuations. Using a magnetically sensitive hyperfine transition of Be+ as a qubit, we measure the fractional decay rate of the stored magnetic field to be at the 10−10 s−1 level. Ramsey interferometry and spin-echo measurements yield coherence times of >400 ms, demonstrating excellent passive magnetic shielding at frequencies down to DC.
KW  - shielding: magnetic (INSPIRE)
KW  - fluctuation: electromagnetic (INSPIRE)
KW  - magnetic field: decay rate (INSPIRE)
KW  - ion: capture (INSPIRE)
KW  - ion: temperature (INSPIRE)
KW  - superconductivity (INSPIRE)
KW  - qubit (INSPIRE)
KW  - hyperfine structure (INSPIRE)
KW  - ion trap: design (INSPIRE)
KW  - interferometer (INSPIRE)
KW  - beryllium: ion (INSPIRE)
KW  - experimental methods (INSPIRE)
KW  - cryogenics (INSPIRE)
KW  - Doppler effect (INSPIRE)
KW  - bibliography (INSPIRE)
LB  - PUB:(DE-HGF)16
C6  - 38065183
UR  - <Go to ISI:>//WOS:001094757600002
DO  - DOI:10.1063/5.0160537
UR  - https://bib-pubdb1.desy.de/record/596670
ER  -