Robust and fast microwave-driven quantum logic for trapped-ion qubits
Abstract: Microwave-driven logic is a promising alternative to laser control in scaling trapped-ion based quantum processors. However, such electronic gates have yet to match the speed offered by their laser-driven counterparts. Here, we implement M{\o}lmer-S{\o}rensen two-qubit gates on ${43}\text{Ca}+$ hyperfine clock qubits in a cryogenic ($\approx25~\text{K}$) surface trap, driven by near-field microwaves. We achieve gate durations of $154~\mu\text{s}$ (with $1.0(2)\%$ error) and $331~\mu\text{s}$ ($0.5(1)\%$ error), which approaches the performance of typical laser-driven gates. In the $331~\mu\text{s}$ gate, we demonstrate a new Walsh-modulated dynamical decoupling scheme which suppresses errors due to fluctuations in the qubit frequency as well as imperfections in the decoupling drive itself.
- H. J. Kimble, The quantum internet, Nature 453, 1023 (2008).
- D. P. DiVincenzo, The physical implementation of quantum computation, Fortschritte der Physik 48, 771 (2000), 0002077 .
- F. Mintert and C. Wunderlich, Ion-trap quantum logic using long-wavelength radiation, Phys. Rev. Lett. 87, 257904 (2001).
- M. Weber, High-fidelity, near-field microwave gates in a cryogenic surface trap, Ph.D. thesis, University of Oxford (2022).
- K. Mølmer and A. Sørensen, Multiparticle entanglement of hot trapped ions, Phys. Rev. Lett. 82, 1835 (1999).
- X. R. Nie, C. F. Roos, and D. F. James, Theory of cross phase modulation for the vibrational modes of trapped ions, Phys. Lett. A 373, 422 (2009).
Paper Prompts
Sign up for free to create and run prompts on this paper using GPT-5.
Top Community Prompts
Collections
Sign up for free to add this paper to one or more collections.