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- W4289644908 abstract "We present the experimental implementation of a two-qubit phase gate, using a radio frequency (RF) controlled trapped-ion quantum processor. The RF-driven gate is generated by a pulsed dynamical decoupling sequence applied to the ions' carrier transitions only. It allows for a tunable phase shift with high-fidelity results, in particular a fringe contrast up to $99_{-2}^{+1}%$ is observed in Ramsey-type measurements. We also prepare a Bell state using this laser-free gate. The phase gate is robust against common sources of error. We investigate the effect of the excitation of the center-of-mass (COM) mode, errors in the axial trap frequency, pulse area errors and errors in sequence timing. The contrast of the phase gate is not significantly reduced up to a COM mode excitation $<20$ phonons, trap frequency errors of +10%, and pulse area errors of -8%. The phase shift is not significantly affected up to $<10$ phonons and pulse area errors of -2%. Both, contrast and phase shift are robust to timing errors up to -30% and +15%. The gate implementation is resource efficient, since only a single driving field is required per ion. Furthermore, it holds the potential for fast gate speeds (gate times on the order of $100~mu$s) by using two axial motional modes of a two-ion crystal through improved setups." @default.
- W4289644908 created "2022-08-03" @default.
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- W4289644908 date "2022-07-30" @default.
- W4289644908 modified "2023-09-26" @default.
- W4289644908 title "Robust Two-Qubit Gates Using Pulsed Dynamical Decoupling" @default.
- W4289644908 doi "https://doi.org/10.48550/arxiv.2208.00187" @default.
- W4289644908 hasPublicationYear "2022" @default.
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