Reversing Hydride Ion Formation in Quantum Information Experiments with Be${}^{+}$

Abstract

We demonstrate photodissociation of BeH${}^{+}$ ions within a Coulomb crystal of thousands of ${}^9$Be${}^{+}$ ions confined in a Penning trap. Because BeH${}^{+}$ ions are created via exothermic reactions between trapped, laser-cooled Be${}^{+}$(${}^2{\text{P}}_{3/2}$) and background H${}_2$ within the vacuum chamber, they represent a major contaminant species responsible for infidelities in large-scale trapped-ion quantum information experiments. The rotational-state-insensitive dissociation scheme described here makes use of 157 nm photons to produce Be${}^{+}$ and H as products, thereby restoring Be${}^{+}$ ions without the need for reloading. This technique facilitates longer experiment runtimes at a given background H${}_2$ pressure, and may be adapted for removal of MgH${}^{+}$ and AlH${}^{+}$ impurities.

6 pages, 3 figures

References in corpus (2)

• 14-qubit entanglement: creation and coherence
• Complete methods set for scalable ion trap quantum information processing

Cited by in corpus (2)

• Simulating generic spin-boson models with matrix product states
• Trapping, cooling, and photodissociation analysis of state-selected H$\_2^{+}$ ions produced by (3+1) multiphoton ionization