Wavelength-insensitive, multispecies entangling gate for group-2 atomic ions

Brian C. Sawyer and Kenton R. Brown
Phys. Rev. A 103, 022427 – Published 25 February 2021

Abstract

We propose an optical scheme for generating entanglement between co-trapped identical or dissimilar alkaline-earth atomic ions (Ca+40, Sr+88, Ba+138, Ra+226) which exhibits fundamental error rates below 104 and can be implemented with a broad range of laser wavelengths spanning from ultraviolet to infrared. We also discuss straightforward extensions of this technique to include the two lightest group-2 ions (Be+, Mg+) for multispecies entanglement. The key elements of this wavelength-insensitive geometric phase gate are the use of a ground (S1/2) and a metastable (D5/2) electronic state as the qubit levels within a σzσz light-shift entangling gate. We present a detailed analysis of the principles and fundamental error sources for this gate scheme which includes photon scattering and spontaneous emission decoherence, calculating two-qubit-gate error rates and durations at fixed laser beam intensity over a large portion of the optical spectrum (300 nm to 2μm) for an assortment of ion pairs. We contrast the advantages and disadvantages of this technique against previous trapped-ion entangling gates and discuss its applications to quantum information processing and simulation with like and multispecies ion crystals.

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  • Received 9 October 2020
  • Accepted 27 January 2021

DOI:https://doi.org/10.1103/PhysRevA.103.022427

©2021 American Physical Society

Physics Subject Headings (PhySH)

Quantum Information, Science & TechnologyAtomic, Molecular & Optical

Authors & Affiliations

Brian C. Sawyer* and Kenton R. Brown

  • Georgia Tech Research Institute, Atlanta, Georgia 30332, USA

  • *brian.sawyer@gtri.gatech.edu
  • kenton.brown@gtri.gatech.edu

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Issue

Vol. 103, Iss. 2 — February 2021

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