Bulletin of the American Physical Society
52nd Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics
Volume 66, Number 6
Monday–Friday, May 31–June 4 2021; Virtual; Time Zone: Central Daylight Time, USA
Session N01: Poster Session II 4pm-6pm CDT
4:00 PM,
Wednesday, June 2, 2021
Abstract: N01.00050 : High-fidelity mixed-species entangling gates for ion-trap quantum computing
Presenter:
Oana Bazavan
Author:
Oana Bazavan
Collaborations:
O. Bazavan, A. C. Hughes, V. M. Schafer, G. Pagano, K. Thirumalai, C. J. Ballance, D. M. Lucas
We present a Mølmer-Sørensen gate entangling a 43Ca+ and an 88Sr+ ion using bichromatic Raman laser beams which are near-resonant with qubit transitions in the hyperfine manifold and in the Zeeman-split levels respectively. We measure a Bell-state fidelity of 99.6(2)%, which is close to the fidelity previously obtained using a mixed-species σz⊗σz light-shift gate in the same experimental setup (99.8(2)% [1]).
The comparison between the two gates allows selection of the more robust mechanism for use in a future networking experiment. The advantage of the Mølmer-Sørensen mechanism is that it can be used on first-order field-insensitive ‘clock’ qubit transitions, which appear in 43Ca+. However, we find that the mixed-species Mølmer-Sørensen gate is far more sensitive to slow drifts in the magnetic field than the light-shift gate.
[1] Hughes, A. C., et al. "Benchmarking of a high-fidelity mixed-species entangling gate." (2020)
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