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Published March 2022 | Submitted + Published
Journal Article Open

Dispersive optical systems for scalable Raman driving of hyperfine qubits

Abstract

Hyperfine atomic states are among the most promising candidates for qubit encoding in quantum information processing. In atomic systems, hyperfine transitions are typically driven through a two-photon Raman process by a laser field which is amplitude modulated at the hyperfine qubit frequency. Here we introduce a method for generating amplitude modulation by phase modulating a laser and reflecting it from a highly dispersive optical element known as a chirped Bragg grating. This approach is passively stable, offers high efficiency, and is compatible with high-power laser sources, enabling large Rabi frequencies and improved quantum coherence. We benchmark this approach by globally driving an array of approximately 300 neutral ⁸⁷Rb atomic qubits trapped in optical tweezers and obtain Rabi frequencies of 2 MHz with photon-scattering error rates of less than 2 × 10⁻⁴ per π pulse. This robust approach can be directly integrated with local addressing optics in both neutral atom and trapped ion systems to facilitate high-fidelity single-qubit operations for quantum information processing.

Additional Information

© 2022 American Physical Society. (Received 28 November 2021; accepted 1 March 2022; published 29 March 2022) We thank many members of the Harvard AMO community, particularly E. Urbach, S. Dakoulas, and J. Doyle for their efforts enabling operation of our laboratories. We additionally thank M. Endres, B. Buscaino, L. Kendrick, P. Samutpraphoot, and W. Campbell for helpful discussions. We acknowledge financial support from the Center for Ultracold Atoms, the National Science Foundation, the U.S. Department of Energy (through Grant No. DE-SC0021013 and LBNL QSA Center), the Army Research Office, ARO MURI, and the DARPA ONISQ program. H.L. acknowledges support from the National Defense Science and Engineering Graduate Fellowship. D.B. acknowledges support from the NSF Graduate Research Fellowship Program (Grant No. DGE1745303) and the Fannie and John Hertz Foundation. G.S. acknowledges support from a fellowship from the Max Planck Harvard Research Center for Quantum Optics. M.G., V.V., and M.D.L. are cofounders and shareholders of QuEra Computing. A.K. and A.O. are shareholders of QuEra Computing.

Attached Files

Published - PhysRevA.105.032618.pdf

Submitted - 2110.14645.pdf

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Additional details

Created:
August 20, 2023
Modified:
October 23, 2023