Coulomb crystallization of xenon highly charged ions in a laser-cooled Ca+ matrix

Abstract

We report on the sympathetic cooling and Coulomb crystallization of xenon highly charged ions (HCIs) with laser-cooled Ca${}^{+}$ ions. The HCIs are produced in a compact electron beam ion trap, then charge selected, decelerated, and finally injected into a cryogenic linear Paul trap. There, they are captured into ${}^{40}$Ca${}^{+}$ Coulomb crystals, and co-crystallized within them, causing dark voids in their fluorescence images. Fine control over the number of trapped ions and HCIs allows us to realize mixed-species crystals with arbitrary ordering patterns. By investigating Xe${}^{q+}$--Ca${}^{+}$ strings, we confirm the HCI charge states, measure their lifetime and characterize the mixed-species motional modes. Our system effectively combines the established quantum control toolbox for Ca${}^{+}$ with the rich set of atomic properties of Xe highly charged ions, providing a resourceful platform for optical frequency metrology, searches for signatures of new physics, and quantum information science.

References in corpus (19)

• A compact ion-trap quantum computing demonstrator
• Optimal metrology with programmable quantum sensors
• Enhanced laboratory sensitivity to variation of the fine-structure constant using highly-charged ions
• Coherent laser spectroscopy of highly charged ions using quantum logic
• Improved limits on the coupling of ultralight bosonic dark matter to photons from optical atomic clock comparisons
• An Optical Atomic Clock Based on a Highly Charged Ion
• The Heidelberg compact electron beam ion traps
• Optical transitions in highly-charged californium ions with high sensitivity to variation of the fine-structure constant
• Measuring the stability of fundamental constants with a network of clocks
• Generalized King linearity and new physics searches with isotope shifts
• Optical clocks based on the Cf${}^{15+}$ and Cf${}^{17+}$ ions
• Sympathetic cooling of molecular ion motion to the ground state
• Algorithmic Ground-state Cooling of Weakly-Coupled Oscillators using Quantum Logic
• An einzel lens with a diagonal-slit central electrode to combine steering and focusing of a low energy ion beam
• Highly charged ions for atomic clocks and search for variation of the fine structure constant
• Reactions of Acetonitrile with Trapped, Translationally Cold Acetylene Cations
• Excited-state magnetic properties of carbon-like ${\text{Ca}}^{14+}$
• Cold highly charged ions in a radio-frequency trap with superconducting magnetic shielding
• Domain formation and structural stabilities in mixed-species Coulomb crystals induced by sympathetically cooled highly charged ions