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Reversing hydride-ion formation in quantum-information experiments with Be+



Brian C. Sawyer, Justin G. Bohnet, Joseph W. Britton, John J. Bollinger


We demonstrate photodissociation of BeH+ ions within a Coulomb crystal of thousands of 9Be+ confined in a Penning trap. The BeH+ molecular ions form via exothermic reactions between trapped, laser-cooled Be+($^2\text{P}_{3/2}$) and background H2 within the vacuum chamber. 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 removes a major contaminant species responsible for infidelities in large-scale trapped-ion quantum information experiments and facilitates their operation over a wider range of background H2 pressures. Extension of this technique to MgH+ and AlH+ impurities is also discussed.
Physical Review A


molecular ions, photodissociation, quantum information


Sawyer, B. , Bohnet, J. , Britton, J. and Bollinger, J. (2015), Reversing hydride-ion formation in quantum-information experiments with Be+, Physical Review A, [online], (Accessed May 30, 2024)


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Created January 12, 2015, Updated February 19, 2017